runtime packages - Page 97

"Exception: No extension found at None" when trying on use Selenium Firefox WebDriver on a Mac

- by Gj

Any ideas? In [1]: from selenium.firefox.webdriver import WebDriver In [2]: d=WebDriver() --------------------------------------------------------------------------- Exception Traceback (most recent call last) /usr/local/selenium-read-only/<ipython console> in <module>() /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/selenium-2.0_dev-py2.6.egg/selenium/firefox/webdriver.pyc in __init__(self, profile, timeout) 48 profile = FirefoxProfile(name=profile) 49 if not profile: ---> 50 profile = FirefoxProfile() 51 self.browser.launch_browser(profile) 52 RemoteWebDriver.__init__(self, /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/selenium-2.0_dev-py2.6.egg/selenium/firefox/firefox_profile.pyc in __init__(self, name, port, template_profile, extension_path) 72 73 if name == ANONYMOUS_PROFILE_NAME: ---> 74 self._create_anonymous_profile(template_profile) 75 self._refresh_ini() 76 else: /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/selenium-2.0_dev-py2.6.egg/selenium/firefox/firefox_profile.pyc in _create_anonymous_profile(self, template_profile) 82 self._copy_profile_source(template_profile) 83 self._update_user_preference() ---> 84 self.add_extension(extension_zip_path=self.extension_path) 85 self._launch_in_silent() 86 /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/selenium-2.0_dev-py2.6.egg/selenium/firefox/firefox_profile.pyc in add_extension(self, force_create, extension_zip_path) 152 not os.path.exists(extension_source_path)): 153 raise Exception( --> 154 "No extension found at %s" % extension_source_path) 155 156 logging.debug("extension_source_path : %s" % extension_source_path) Exception: No extension found at None

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From VB6 to .net via COM and Remoting...What a mess!

- by Robert

I have some legacy vb6 applications that need to talk to my .Net engine application. The engine provides an interface that can be connected to via .net Remoting. Now I have a stub class library that wraps all of the types that the interface exposes. The purpose of this stub is to translate my .net types into COM-friendly types. When I run this class library as a console application, it is able to connect to the engine, call various methods, and successfully return the wrapped types. The next step in the chain is to allow my VB6 application to call this COM enabled stub. This works fine for my main engine-entry type (IModelFetcher which is wrapped as COM_ModelFetcher). However, when I try and get any of the model fetcher's model types (IClientModel, wrapped as COM_IClientModel, IUserModel, wrapped as COM_IUserModel, e.t.c.), I get the following exception: [Exception - type: System.InvalidCastException 'Return argument has an invalid type.'] in mscorlib at System.Runtime.Remoting.Proxies.RealProxy.ValidateReturnArg(Object arg, Type paramType) at System.Runtime.Remoting.Proxies.RealProxy.PropagateOutParameters(IMessage msg, Object[] outArgs, Object returnValue) at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at AWT.Common.AWTEngineInterface.IModelFetcher.get_ClientModel() at AWT.Common.AWTEngineCOMInterface.COM_ModelFetcher.GetClientModel() The first thing I did when I saw this was to handle the 'AppDomain.CurrentDomain.AssemblyResolve' event, and this allowed me to load the required assemblies. However, I'm still getting this exception now. My AssemblyResolve event handler is loading three assemblies correctly, and I can confirm that it does not get called prior to this exception. Can someone help me untie myself from this mess of interprocess communication?!

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SQLAlchemy DetachedInstanceError with regular attribute (not a relation)

- by haridsv

I just started using SQLAlchemy and get a DetachedInstanceError and can't find much information on this anywhere. I am using the instance outside a session, so it is natural that SQLAlchemy is unable to load any relations if they are not already loaded, however, the attribute I am accessing is not a relation, in fact this object has no relations at all. I found solutions such as eager loading, but I can't apply to this because this is not a relation. I even tried "touching" this attribute before closing the session, but it still doesn't prevent the exception. What could be causing this exception for a non-relational property even after it has been successfully accessed once before? Any help in debugging this issue is appreciated. I will meanwhile try to get a reproducible stand-alone scenario and update here. Update: This is the actual exception message with a few stacks: File "/home/hari/bin/lib/python2.6/site-packages/SQLAlchemy-0.6.1-py2.6.egg/sqlalchemy/orm/attributes.py", line 159, in __get__ return self.impl.get(instance_state(instance), instance_dict(instance)) File "/home/hari/bin/lib/python2.6/site-packages/SQLAlchemy-0.6.1-py2.6.egg/sqlalchemy/orm/attributes.py", line 377, in get value = callable_(passive=passive) File "/home/hari/bin/lib/python2.6/site-packages/SQLAlchemy-0.6.1-py2.6.egg/sqlalchemy/orm/state.py", line 280, in __call__ self.manager.deferred_scalar_loader(self, toload) File "/home/hari/bin/lib/python2.6/site-packages/SQLAlchemy-0.6.1-py2.6.egg/sqlalchemy/orm/mapper.py", line 2323, in _load_scalar_attributes (state_str(state))) DetachedInstanceError: Instance <ReportingJob at 0xa41cd8c> is not bound to a Session; attribute refresh operation cannot proceed The partial model looks like this: metadata = MetaData() ModelBase = declarative_base(metadata=metadata) class ReportingJob(ModelBase): __tablename__ = 'reporting_job' job_id = Column(BigInteger, Sequence('job_id_sequence'), primary_key=True) client_id = Column(BigInteger, nullable=True) And the field client_id is what is causing this exception with a usage like the below: Query: jobs = session \ .query(ReportingJob) \ .filter(ReportingJob.job_id == job_id) \ .all() if jobs: # FIXME(Hari): Workaround for the attribute getting lazy-loaded. jobs[0].client_id return jobs[0] This is what triggers the exception later out of the session scope: msg = msg + ", client_id: %s" % job.client_id

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virtualenv macosX --no-site-package ignored

- by Tristram Gräbener

Hello, I'm having problems with macOSX and virtualenv. It seems to ignore --no-site-package. Using exactly the same commands with linux (archlinux) it works. It it macOSX 10.5 with python 2.5 curl -o virtualenv.py 'http://bitbucket.org/ianb/virtualenv/raw/tip/virtualenv.py Create a new environment python virtualenv.py --no-site-packages foo New python executable in foo/bin/python Installing setuptools...........................done. Activate it source foo/bin/activate Try to install something in it. Despite virtualenv it looks for the system-wide install easy_install cherrypy Searching for cherrypy Best match: CherryPy 3.1.2 Adding CherryPy 3.1.2 to easy-install.pth file Using /Library/Python/2.5/site-packages Processing dependencies for cherrypy Finished processing dependencies for cherrypy Yet it doesn't find the module (foo)guidage-multimodal:~ tristram$ python Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12) [GCC 4.0.1 (Apple Inc. build 5465)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import cherrypy Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named cherrypy I tried PIP after looking at http://stackoverflow.com/questions/1382925/virtualenv-no-site-packages-and-pip-still-finding-global-packages However it fails installing psycopg2 (some problems with gcc). Also I would like to be able to have a setup.py (from distribute) that does the whole woork

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HTTPSConnection module missing in Python 2.6 on CentOS 5.2

- by d2kagw

Hi guys, I'm playing around with a Python application on CentOS 5.2. It uses the Boto module to communicate with Amazon Web Services, which requires communication through a HTTPS connection. When I try running my application I get an error regarding HTTPSConnection being missing: "AttributeError: 'module' object has no attribute 'HTTPSConnection'" Google doesn't really return anything relevant, I've tried most of the solutions but none of them solve the problem. Has anyone come across anything like it? Here's the traceback: Traceback (most recent call last): File "./chatter.py", line 114, in <module> sys.exit(main()) File "./chatter.py", line 92, in main chatter.status( ) File "/mnt/application/chatter/__init__.py", line 161, in status cQueue.connect() File "/mnt/application/chatter/tools.py", line 42, in connect self.connection = SQSConnection(cConfig.get("AWS", "KeyId"), cConfig.get("AWS", "AccessKey")); File "/usr/local/lib/python2.6/site-packages/boto-1.7a-py2.6.egg/boto/sqs/connection.py", line 54, in __init__ self.region.endpoint, debug, https_connection_factory) File "/usr/local/lib/python2.6/site-packages/boto-1.7a-py2.6.egg/boto/connection.py", line 418, in __init__ debug, https_connection_factory) File "/usr/local/lib/python2.6/site-packages/boto-1.7a-py2.6.egg/boto/connection.py", line 189, in __init__ self.refresh_http_connection(self.server, self.is_secure) File "/usr/local/lib/python2.6/site-packages/boto-1.7a-py2.6.egg/boto/connection.py", line 247, in refresh_http_connection connection = httplib.HTTPSConnection(host) AttributeError: 'module' object has no attribute 'HTTPSConnection'

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Cocoa App with Python extension which use Scipy -> ImportError: No module named scipy

- by Snej

Hi: I have installed Scipy (via macports) for Python on my Mac and it runs fine when running Python scripts. But now I'm using Scipy (via PyObjc) for calculations embedded in a Cocoa App frontend. The following error occurs: ImportError: No module named scipy I am using the "Python.framework" in XCode. Does anybody know why Scipy module is not found? I even added it manually to the module search path via sys.path.append("/opt/local/var/macports/software/py26-scipy/0.7.1_0+gcc43/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/scipy/") EDIT: I found the problem myself. The path should be without "/scipy" at the end. But now I got an architecture problem: ImportError: dlopen(/opt/local/var/macports/software/py26-scipy/0.7.1_0+gcc43/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/scipy/fftpack/_fftpack.so, 2): no suitable image found. Did find: /opt/local/var/macports/software/py26-scipy/0.7.1_0+gcc43/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/scipy/fftpack/_fftpack.so: mach-o, but wrong architecture EDIT 2: I checked the architectures: Yes, sure it is an architecture problem. But when I run: file /opt/local/var/macports/software/py26-scipy/0.7.1_0+gcc43/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/scipy/fftpack/_fftpack.so I get a result Mach-O 64-bit bundle x86_64. And the Mac OS 10.6 PYTHON is: Mach-O universal binary with 3 architectures /usr/bin/python (for architecture x86_64): Mach-O 64-bit executable x86_64 /usr/bin/python (for architecture i386): Mach-O executable i386 /usr/bin/python (for architecture ppc7400): Mach-O executable ppc I build the XCode project as x86_64.

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How do I recover from pushing a gitosis.conf file with parsing errors due to line breaks?

- by Kasia

I have successfully set up gitosis for an Android mirror (containing multiple git repositories). While adding a new .git path following writable= in gitosis.conf I managed to insert a few line breaks. Saved, committed and pushed to server when I received the following parsing error: Traceback (most recent call last): File "/usr/bin/gitosis-run-hook", line 8, in load_entry_point('gitosis==0.2', 'console_scripts', 'gitosis-run-hook')() File "/usr/lib/python2.5/site-packages/gitosis-0.2-py2.5.egg/gitosis/app.py", line 24, in run return app.main() File "/usr/lib/python2.5/site-packages/gitosis-0.2-py2.5.egg/gitosis/app.py", line 38, in main self.handle_args(parser, cfg, options, args) File "/usr/lib/python2.5/site-packages/gitosis-0.2-py2.5.egg/gitosis/run_hook.py", line 75, in handle_args post_update(cfg, git_dir) File "/usr/lib/python2.5/site-packages/gitosis-0.2-py2.5.egg/gitosis/run_hook.py", line 33, in post_update cfg.read(os.path.join(export, '..', 'gitosis.conf')) File "/usr/lib/python2.5/ConfigParser.py", line 267, in read self._read(fp, filename) File "/usr/lib/python2.5/ConfigParser.py", line 490, in _read raise e ConfigParser.ParsingError: File contains parsing errors: ./gitosis-export/../gitosis.conf (...) I have removed the line break and amendend the commit by git commit -m "fix linebreak" --amend However git push still yields the exact same error. It leads me to believe gitosis is preventing me from doing any further pushes. How do I recover from this?

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BeautifulSoup HTMLParseError. What's wrong with this?

- by user1915496

This is my code: from bs4 import BeautifulSoup as BS import urllib2 url = "http://services.runescape.com/m=news/recruit-a-friend-for-free-membership-and-xp" res = urllib2.urlopen(url) soup = BS(res.read()) other_content = soup.find_all('div',{'class':'Content'})[0] print other_content Yet an error comes up: /Library/Python/2.7/site-packages/bs4/builder/_htmlparser.py:149: RuntimeWarning: Python's built-in HTMLParser cannot parse the given document. This is not a bug in Beautiful Soup. The best solution is to install an external parser (lxml or html5lib), and use Beautiful Soup with that parser. See http://www.crummy.com/software/BeautifulSoup/bs4/doc/#installing-a-parser for help. "Python's built-in HTMLParser cannot parse the given document. This is not a bug in Beautiful Soup. The best solution is to install an external parser (lxml or html5lib), and use Beautiful Soup with that parser. See http://www.crummy.com/software/BeautifulSoup/bs4/doc/#installing-a-parser for help.")) Traceback (most recent call last): File "web.py", line 5, in <module> soup = BS(res.read()) File "/Library/Python/2.7/site-packages/bs4/__init__.py", line 172, in __init__ self._feed() File "/Library/Python/2.7/site-packages/bs4/__init__.py", line 185, in _feed self.builder.feed(self.markup) File "/Library/Python/2.7/site-packages/bs4/builder/_htmlparser.py", line 150, in feed raise e I've let two other people use this code, and it works for them perfectly fine. Why is it not working for me? I have bs4 installed...

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Is ADO.NET Entity framework database schema update possible ?

- by fyasar

Hi All I'm working on proof of concept application like crm and i need your some advice. My application's data layer completely dynamic and run onto EF 3.5. When the user update the entity, change relation or add new column to the database, first i'm planning make for these with custom classes. After I rebuild my database model layer with new changes during the application runtime. And my model layer tie with tightly coupled to my project for easy reflecting model layer changes (It connected to my project via interfaces and loading onto to application domain in the runtime). I need to create dynamic entities, create entity relations and modify them during the runtime after that i need to create change database script for updating database schema. I know ADO.NET team says "we will be able to provide this property in EF 4.0", but i don't need to wait for them. How can i update database changes during the runtime via EF 3.5 ? For example, i need to create new entity or need to change some entity schema, add new properties or change property types after than how can apply these changes on the physical database schema ? Any ideas ?

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C Run-Time library part 2

- by b-gen-jack-o-neill

Hi, I was suggested when I have some further questions on my older ones, to create newer Question and reffer to old one. So, this is the original question: What is the C runtime library? OK, from your answers, I now get thet statically linked libraries are Microsoft implementation of C standart functions. Now: If I get it right, the scheme would be as follow: I want to use printf(), so I must include which just tels compiler there us functio printf() with these parameters. Now, when I compile code, becouse printf() is defined in C Standart Library, and becouse Microsoft decided to name it C Run Time library, it gets automatically statically linked from libcmt.lib (if libcmt.lib is set in compiler) at compile time. I ask, becouse on wikipedia, in article about runtime library there is that runtime library is linked in runtime, but .lib files are linked at compile time, am I right? Now, what confuses me. There is .dll version of C standart library. But I thought that to link .dll file, you must actually call winapi program to load that library. So, how can be these functions dynamically linked, if there is no static library to provide code to tell Windows to load desired functions from dll? And really last question on this subject - are C Standart library functions also calls to winapi even they are not .dll files like more advanced WinAPI functions? I mean, in the end to access framebuffer and print something you must tell Windows to do it, since OS cannot let you directly manipulate HW. I think of it like the OS must be written to support all C standart library functions same way across similiar versions, since they are statically linked, and can differently support more complex WinAPI calls becouse new version of OS can have adjustements in the .dll file.

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Is ADO.NET Entity framework database schema update possible?

- by fyasar

I'm working on proof of concept application like crm and i need your some advice. My application's data layer completely dynamic and run onto EF 3.5. When the user update the entity, change relation or add new column to the database, first i'm planning make for these with custom classes. After I rebuild my database model layer with new changes during the application runtime. And my model layer tie with tightly coupled to my project for easy reflecting model layer changes (It connected to my project via interfaces and loading onto to application domain in the runtime). I need to create dynamic entities, create entity relations and modify them during the runtime after that i need to create change database script for updating database schema. I know ADO.NET team says "we will be able to provide this property in EF 4.0", but i don't need to wait for them. How can i update database changes during the runtime via EF 3.5 ? For example, i need to create new entity or need to change some entity schema, add new properties or change property types after than how can apply these changes on the physical database schema ? Any ideas ?

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tracd server problems

- by deddihp

Hello, I got the following error while accessing tracd server, what's going on ? Thanks. [oke@localhost Trac-0.11.7]$ sudo tracd -p 8000 /home/deddihp/trac/ Server starting in PID 5082. Serving on 0.0.0.0:8000 view at http://127.0.0.1:8000/ ---------------------------------------- Exception happened during processing of request from ('127.0.0.1', 47804) Traceback (most recent call last): File "/usr/lib/python2.6/SocketServer.py", line 558, in process_request_thread self.finish_request(request, client_address) File "/usr/lib/python2.6/SocketServer.py", line 320, in finish_request self.RequestHandlerClass(request, client_address, self) File "/usr/lib/python2.6/SocketServer.py", line 615, in __init__ self.handle() File "/usr/lib/python2.6/BaseHTTPServer.py", line 329, in handle self.handle_one_request() File "/usr/lib/python2.6/site-packages/Trac-0.11.7-py2.6.egg/trac/web/wsgi.py", line 194, in handle_one_request gateway.run(self.server.application) File "/usr/lib/python2.6/site-packages/Trac-0.11.7-py2.6.egg/trac/web/wsgi.py", line 94, in run response = application(self.environ, self._start_response) File "/usr/lib/python2.6/site-packages/Trac-0.11.7-py2.6.egg/trac/web/standalone.py", line 100, in __call__ return self.application(environ, start_response) File "/usr/lib/python2.6/site-packages/Trac-0.11.7-py2.6.egg/trac/web/main.py", line 346, in dispatch_request locale.setlocale(locale.LC_ALL, environ['trac.locale']) File "/usr/lib/python2.6/locale.py", line 513, in setlocale return _setlocale(category, locale) Error: unsupported locale setting ----------------------------------------

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Velocity engine fails to load template from a remote shared folder

- by performanceuser

I have following code File temlateFile = new File( "D:/config/emails/MailBody.vm" ); temlateFile.exists(); VelocityEngine velocityEngine = new VelocityEngine(); velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, "file"); velocityEngine.setProperty("file.resource.loader.class", FileResourceLoader.class.getName()); velocityEngine.setProperty("file.resource.loader.path", temlateFile.getParentFile().getAbsolutePath()); velocityEngine.init(); template = velocityEngine.getTemplate( temlateFile.getName() ); This works because it is loading a file from local file system. Once I change the first like to: File temlateFile = new File( "//remote/config/emails/MailBody.vm" ); It doesn't work. org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource 'MailBody.vm' at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:474) at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:352) at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1533) at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1514) at org.apache.velocity.app.VelocityEngine.getTemplate(VelocityEngine.java:373) at com.actuate.iserver.mail.VelocityContent.<init>(VelocityContent.java:33) at com.actuate.iserver.mail.VolumeCreationMail.<init>(VolumeCreationMail.java:40) at com.actuate.iserver.mail.VolumeCreationMail.main(VolumeCreationMail.java:67) In both cases temlateFile.exists() always return true. Any ideas?

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Cannot open a SQL2000 DTS package I imported into SQL2008

- by RJ

I am running into a problem trying to open a SQL2000 DTS package I imported into SQL2008. I set up a new server and installed a fresh install of SQL2008. The database I need to run is a SQL2000 database. I moved the database over with no problem but there are a few DTS packages that need to run in legacy on SQL2008. I exported the DTS packages I need out of SQL2000 and imported them successfully into SQL2008. My SQL2008 server is x64. I can see the DTS packages under Data Transformation Service in Legacy but when I try to open the package I get this message. "SQL Server 2000 DTS Designer components are required to edit DTS packages. Install the special web download, "SQL Server 2000 DTS Designer components" to use this feature. (Microsoft.SqlServer.DtsObjectExplorerUI)" I downloaded the components and installed them and still get this error. I researched and found an article about this not working on x64 so I have an x86 machine that I installed the SQL2008 tools and tried to open the package from there and got the same error. I have spent days on this and need help. Has anyone run across this and can tell me what to do. If you have solved this problem, please help me out. Thanks.

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how to solve a weired swig python c++ interfacing type error

- by user2981648

I want to use swig to switch a simple cpp function to python and use "scipy.integrate.quadrature" function to calculate the integration. But python 2.7 reports a type error. Do you guys know what is going on here? Thanks a lot. Furthermore, "scipy.integrate.quad" runs smoothly. So is there something special for "scipy.integrate.quadrature" function? The code is in the following: File "testfunctions.h": #ifndef TESTFUNCTIONS_H #define TESTFUNCTIONS_H double test_square(double x); #endif File "testfunctions.cpp": #include "testfunctions.h" double test_square(double x) { return x * x; } File "swig_test.i" : /* File : swig_test.i */ %module swig_test %{ #include "testfunctions.h" %} /* Let's just grab the original header file here */ %include "testfunctions.h" File "test.py": import scipy.integrate import _swig_test print scipy.integrate.quadrature(_swig_test.test_square, 0., 1.) error info: UMD has deleted: _swig_test Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 523, in runfile execfile(filename, namespace) File "D:\data\haitaliu\Desktop\Projects\swig_test\Release\test.py", line 4, in <module> print scipy.integrate.quadrature(_swig_test.test_square, 0., 1.) File "C:\Python27\lib\site-packages\scipy\integrate\quadrature.py", line 161, in quadrature newval = fixed_quad(vfunc, a, b, (), n)[0] File "C:\Python27\lib\site-packages\scipy\integrate\quadrature.py", line 61, in fixed_quad return (b-a)/2.0*sum(w*func(y,*args),0), None File "C:\Python27\lib\site-packages\scipy\integrate\quadrature.py", line 90, in vfunc return func(x, *args) TypeError: in method 'test_square', argument 1 of type 'double'

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Ops Center Solaris 11 IPS Repository Management: Using ISO Images

- by S Stelting

Please join us for a live WebEx presentation of this topic on Tuesday, November 20th at 9am MDT. Details for the call are provided below: https://oracleconferencing.webex.com/oracleconferencing/j.php?ED=209834017&UID=1512096072&PW=NYTVlZTYxMzdm&RT=MiMxMQ%3D%3D Meeting password: oracle123 Call-in toll-free number: 1-866-682-4770 International numbers: http://www.intercall.com/oracle/access_numbers.htm Conference Code: 762 9343 # Security Code: 7777 # With Enterprise Manager Ops Center 12c, you can provision, patch, monitor and manage Oracle Solaris 11 instances. To do this, Ops Center creates and maintains a Solaris 11 Image Packaging System (IPS) repository on the Enterprise Controller. During the Enterprise Controller configuration, you can load repository content directly from Oracle's Support Web site and subsequently synchronize the repository as new content becomes available. Of course, you can also use Solaris 11 ISO images to create and update your Ops Center repository. There are a few excellent reasons for doing this: You're running Ops Center in disconnected mode, and don't have Internet access on your Enterprise Controller You'd rather avoid the bandwidth associated with live synchronization of a Solaris 11 package repository This demo will show you how to use Solaris 11 ISO images to set up and update your Ops Center repository. Prerequisites This tip assumes that you've already installed the Enterprise Controller on a Solaris 11 OS instance and that you're ready for post-install configuration. In addition, there are specific Ops Center and OS version requirements depending on which version of Solaris 11 you plan to install.You can get full details about the requirements in the Release Notes for Ops Center 12c update 2. Additional information is available in the Ops Center update 2 Readme document. Part 1: Using a Solaris 11 ISO Image to Create an Ops Center Repository Step 1 – Download the Solaris 11 Repository Image The Oracle Web site provides a number of download links for official Solaris 11 images. Among those links is a two-part downloadable repository image, which provides repository content for Solaris 11 SPARC and X86 architectures. In this case, I used the Solaris 11 11/11 image. First, navigate to the Oracle Web site and accept the OTN License agreement: http://www.oracle.com/technetwork/server-storage/solaris11/downloads/index.html Next, download both parts of the Solaris 11 repository image. I recommend using the Solaris 11 11/11 image, and have provided the URLs here: http://download.oracle.com/otn/solaris/11/sol-11-1111-repo-full.iso-ahttp://download.oracle.com/otn/solaris/11/sol-11-1111-repo-full.iso-b Finally, use the cat command to generate an ISO image you can use to create your repository: # cat sol-11-1111-repo-full.iso-a sol-11-1111-repo-full.iso-b > sol-11-1111-repo-full.iso The process is very similar if you plan to set up a Solaris 11.1 release in Ops Center. In that case, navigate to the Solaris 11 download page, accept the license agreement and download both parts of the Solaris 11.1 repository image. Use the cat command to create a single ISO image for Solaris 11.1 Step 2 – Mount the Solaris 11 ISO Image in your Local Filesystem Once you have created the Solaris 11 ISO file, use the mount command to attach it to your local filesystem. After the image has been mounted, you can browse the repository from the ./repo subdirectory, and use the pkgrepo command to verify that Solaris 11 recognizes the content: Step 3 – Use the Image to Create your Ops Center Repository When you have confirmed the repository is available, you can use the image to create the Enterprise Controller repository. The operation will be slightly different depending on whether you configure Ops Center for Connected or Disconnected Mode operation.For connected mode operation, specify the mounted ./repo directory in step 4.1 of the configuration wizard, replacing the default Web-based URL. Since you're synchronizing from an OS repository image, you don't need to specify a key or certificate for the operation. For disconnected mode configuration, specify the Solaris 11 directory along with the path to the disconnected mode bundle downloaded by running the Ops Center harvester script: Ops Center will run a job to import package content from the mounted ISO image. A synchronization job can take several hours to run – in my case, the job ran for 3 hours, 22 minutes on a SunFire X4200 M2 server. During the job, Ops Center performs three important tasks: Synchronizes all content from the image and refreshes the repository Updates the IPS publisher information Creates OS Provisioning profiles and policies based on the content When the job is complete, you can unmount the ISO image from your Enterprise Controller. At that time, you can view the repository contents in your Ops Center Solaris 11 library. For the Solaris 11 11/11 release, you should see 8,668 packages and patches in the contents. You should also see default deployment plans for Solaris 11 provisioning. As part of the repository import, Ops Center generates plans and profiles for desktop, small and large servers for the SPARC and X86 architecture. Part 2: Using a Solaris 11 SRU to update an Ops Center Repository It's possible to use the same approach to upgrade your Ops Center repository to a Solaris 11 Support Repository Update, or SRU. Each SRU provides packages and updates to Solaris 11 - for example, SRU 8.5 provided the packaged for Oracle VM Server for SPARC 2.2 SRUs are available for download as ISO images from My Oracle Support, under document ID 1372094.1. The document provides download links for all SRUs which have been released by Oracle for Solaris 11. SRUs are cumulative, so later versions include the packages from earlier SRUs. After downloading an ISO image for an SRU, you can mount it to your local filesystem using a mount command similar to the one shown for Solaris 11 11/11. When the ISO image is mounted to the file system, you can perform the Add Content action from the Solaris 11 Library to synchronize packages and patches from the mounted image. I used the same mount point, so the repository URL was file://mnt/repo once again: After the synchronization of an SRU is complete, you can verify its content in the Solaris 11 library using the search function. The version pattern is 0.175.0.#, where the # is the same value as the SRU. In this example, I upgraded to SRU 1. The update job ran in just under 8 minutes, and a quick search shows that 22 software components were added to the repository: It's also possible to search for "Support Repository Update" to confirm the SRU was successfully added to the repository. Details on any of the update content are available by clicking the "View Details" button under the Packages/Patches entry.

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C#/.NET Little Pitfalls: The Dangers of Casting Boxed Values

- by James Michael Hare

Starting a new series to parallel the Little Wonders series. In this series, I will examine some of the small pitfalls that can occasionally trip up developers. Introduction: Of Casts and Conversions What happens when we try to assign from an int and a double and vice-versa? 1: double pi = 3.14; 2: int theAnswer = 42; 3: 4: // implicit widening conversion, compiles! 5: double doubleAnswer = theAnswer; 6: 7: // implicit narrowing conversion, compiler error! 8: int intPi = pi; As you can see from the comments above, a conversion from a value type where there is no potential data loss is can be done with an implicit conversion. However, when converting from one value type to another may result in a loss of data, you must make the conversion explicit so the compiler knows you accept this risk. That is why the conversion from double to int will not compile with an implicit conversion, we can make the conversion explicit by adding a cast: 1: // explicit narrowing conversion using a cast, compiler 2: // succeeds, but results may have data loss: 3: int intPi = (int)pi; So for value types, the conversions (implicit and explicit) both convert the original value to a new value of the given type. With widening and narrowing references, however, this is not the case. Converting reference types is a bit different from converting value types. First of all when you perform a widening or narrowing you don’t really convert the instance of the object, you just convert the reference itself to the wider or narrower reference type, but both the original and new reference type both refer back to the same object. Secondly, widening and narrowing for reference types refers the going down and up the class hierarchy instead of referring to precision as in value types. That is, a narrowing conversion for a reference type means you are going down the class hierarchy (for example from Shape to Square) whereas a widening conversion means you are going up the class hierarchy (from Square to Shape). 1: var square = new Square(); 2: 3: // implicitly convers because all squares are shapes 4: // (that is, all subclasses can be referenced by a superclass reference) 5: Shape myShape = square; 6: 7: // implicit conversion not possible, not all shapes are squares! 8: // (that is, not all superclasses can be referenced by a subclass reference) 9: Square mySquare = (Square) myShape; So we had to cast the Shape back to Square because at that point the compiler has no way of knowing until runtime whether the Shape in question is truly a Square. But, because the compiler knows that it’s possible for a Shape to be a Square, it will compile. However, if the object referenced by myShape is not truly a Square at runtime, you will get an invalid cast exception. Of course, there are other forms of conversions as well such as user-specified conversions and helper class conversions which are beyond the scope of this post. The main thing we want to focus on is this seemingly innocuous casting method of widening and narrowing conversions that we come to depend on every day and, in some cases, can bite us if we don’t fully understand what is going on! The Pitfall: Conversions on Boxed Value Types Can Fail What if you saw the following code and – knowing nothing else – you were asked if it was legal or not, what would you think: 1: // assuming x is defined above this and this 2: // assignment is syntactically legal. 3: x = 3.14; 4: 5: // convert 3.14 to int. 6: int truncated = (int)x; You may think that since x is obviously a double (can’t be a float) because 3.14 is a double literal, but this is inaccurate. Our x could also be dynamic and this would work as well, or there could be user-defined conversions in play. But there is another, even simpler option that can often bite us: what if x is object? 1: object x; 2: 3: x = 3.14; 4: 5: int truncated = (int) x; On the surface, this seems fine. We have a double and we place it into an object which can be done implicitly through boxing (no cast) because all types inherit from object. Then we cast it to int. This theoretically should be possible because we know we can explicitly convert a double to an int through a conversion process which involves truncation. But here’s the pitfall: when casting an object to another type, we are casting a reference type, not a value type! This means that it will attempt to see at runtime if the value boxed and referred to by x is of type int or derived from type int. Since it obviously isn’t (it’s a double after all) we get an invalid cast exception! Now, you may say this looks awfully contrived, but in truth we can run into this a lot if we’re not careful. Consider using an IDataReader to read from a database, and then attempting to select a result row of a particular column type: 1: using (var connection = new SqlConnection("some connection string")) 2: using (var command = new SqlCommand("select * from employee", connection)) 3: using (var reader = command.ExecuteReader()) 4: { 5: while (reader.Read()) 6: { 7: // if the salary is not an int32 in the SQL database, this is an error! 8: // doesn't matter if short, long, double, float, reader [] returns object! 9: total += (int) reader["annual_salary"]; 10: } 11: } Notice that since the reader indexer returns object, if we attempt to convert using a cast to a type, we have to make darn sure we use the true, actual type or this will fail! If the SQL database column is a double, float, short, etc this will fail at runtime with an invalid cast exception because it attempts to convert the object reference! So, how do you get around this? There are two ways, you could first cast the object to its actual type (double), and then do a narrowing cast to on the value to int. Or you could use a helper class like Convert which analyzes the actual run-time type and will perform a conversion as long as the type implements IConvertible. 1: object x; 2: 3: x = 3.14; 4: 5: // if you want to cast, must cast out of object to double, then 6: // cast convert. 7: int truncated = (int)(double) x; 8: 9: // or you can call a helper class like Convert which examines runtime 10: // type of the value being converted 11: int anotherTruncated = Convert.ToInt32(x); Summary You should always be careful when performing a conversion cast from values boxed in object that you are actually casting to the true type (or a sub-type). Since casting from object is a widening of the reference, be careful that you either know the exact, explicit type you expect to be held in the object, or instead avoid the cast and use a helper class to perform a safe conversion to the type you desire. Technorati Tags: C#,.NET,Pitfalls,Little Pitfalls,BlackRabbitCoder

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LightDM will not start after stopping it

- by Sweeters

I am running Ubuntu 11.10 "Oneiric Ocelot", and in trying to install the nvidia CUDA developer drivers I switched to a virtual terminal (Ctrl-Alt-F5) and stopped lightdm (installation required that no X server instance be running) through sudo service lightdm stop. Re-starting lightdm with sudo service lightdm start did not work: A couple of * Starting [...] lines where displayed, but the process hanged. (I do not remember at which point, but I think it was * Starting System V runlevel compatibility. I manually rebooted my laptop, and ever since booting seems to hang, usually around the * Starting anac(h)ronistic cron [OK] log line (not consistently at that point, though). From that point on, I seem to be able to interact with my system only through a tty session (Ctrl-Alt-F1). I've tried purging and reinstalling both lightdm and gdm, as well as selecting both as the default display managers (through sudo dpkg-reconfigure [lightdm / gdm] or by manually editing /etc/X11/default-display-manager) through both apt-get and aptitude (that shouldn't make a difference anyway) after updating the packages, but the problem persists. Some of the responses I'm getting are the following: After running sudo dpkg-reconfigure lightdm (but not ... gdm) I get the following message: dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_NAME missing dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_PACKAGE missing After trying sudo service lightdm start or sudo start lightdm I get to see the boot loading screen again but nothing changes. If I go back to the tty shell I see lightdm start/running, process <num> but ps -e | grep lightdm gives no output. After trying sudo service gdm start or sudo starg gdm I get the gdm start/running, process <num> message, and gdm-binary is supposedly an active process, but all that happens is that the screen blinks a couple of times and nothing else. Other candidate solutions that I'd found on the web included running startx but when I try that I get an error output [...] Fatal server error: no screens found [...]. Moreover, I made sure that lightdm-gtk-greeter is installed but that did not help either. Please excuse my not including complete outputs/logs; I am writing this post from another computer and it's hard to manually copy the complete logs. Also, I've seen several posts that had to do with similar problems, but either there was no fix, or the one suggested did not work for me. In closing: Please help! I very much hope to avoid re-installing Ubuntu from scratch! :) Alex @mosi I did not manage to fix the NVIDIA kernel driver as per your instructions. I should perhaps mention that I'm on a Dell XPS15 laptop with an NVIDIA Optimus graphics card, and that I have bumblebee installed (which installs nvidia drivers during its installation, I believe). Issuing the mentioned commands I get the following: ~$uname -r 3.0.0-12-generic ~$lsmod | grep -i nvidia nvidia 11713772 0 ~$dmesg | grep -i nvidia [ 8.980041] nvidia: module license 'NVIDIA' taints kernel. [ 9.354860] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354864] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354868] nvidia 0000:01:00.0: enabling device (0006 -> 0007) [ 9.354873] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 9.354879] nvidia 0000:01:00.0: setting latency timer to 64 [ 9.355052] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 280.13 Wed Jul 27 16:53:56 PDT 2011 Also, running aptitude search nvidia gives me the following: p nvidia-173 - NVIDIA binary Xorg driver, kernel module a p nvidia-173-dev - NVIDIA binary Xorg driver development file p nvidia-173-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-173-updates-dev - NVIDIA binary Xorg driver development file p nvidia-96 - NVIDIA binary Xorg driver, kernel module a p nvidia-96-dev - NVIDIA binary Xorg driver development file p nvidia-96-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-96-updates-dev - NVIDIA binary Xorg driver development file p nvidia-cg-toolkit - Cg Toolkit - GPU Shader Authoring Language p nvidia-common - Find obsolete NVIDIA drivers i nvidia-current - NVIDIA binary Xorg driver, kernel module a p nvidia-current-dev - NVIDIA binary Xorg driver development file c nvidia-current-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-current-updates-dev - NVIDIA binary Xorg driver development file i nvidia-settings - Tool of configuring the NVIDIA graphics dr p nvidia-settings-updates - Tool of configuring the NVIDIA graphics dr v nvidia-va-driver - v nvidia-va-driver - I've tried manually installing (sudo aptitude install <package>) packages nvidia-common and nvidia-settings-updates but to no avail. For example, sudo aptitude install nvidia-settings-updates returns the following log: Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... No packages will be installed, upgraded, or removed. 0 packages upgraded, 0 newly installed, 0 to remove and 83 not upgraded. Need to get 0 B of archives. After unpacking 0 B will be used. Writing extended state information... Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... The same happens with the Linux headers (i.e. I cannot seem to be able to install linux-headers-3.0.0-12-generic). The output of aptitude search linux-headers is as follows: v linux-headers - v linux-headers - v linux-headers-2.6 - i linux-headers-2.6.38-11 - Header files related to Linux kernel versi i linux-headers-2.6.38-11-generic - Linux kernel headers for version 2.6.38 on i A linux-headers-2.6.38-8 - Header files related to Linux kernel versi i A linux-headers-2.6.38-8-generic - Linux kernel headers for version 2.6.38 on v linux-headers-3 - v linux-headers-3.0 - v linux-headers-3.0 - i A linux-headers-3.0.0-12 - Header files related to Linux kernel versi p linux-headers-3.0.0-12-generic - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-generic- - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-server - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-virtual - Linux kernel headers for version 3.0.0 on p linux-headers-generic - Generic Linux kernel headers p linux-headers-generic-pae - Generic Linux kernel headers v linux-headers-lbm - v linux-headers-lbm - v linux-headers-lbm-2.6 - v linux-headers-lbm-2.6 - p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-serv - Header files related to linux-backports-mo p linux-headers-server - Linux kernel headers on Server Equipment. p linux-headers-virtual - Linux kernel headers for virtual machines @heartsmagic I did try purging and reinstalling any nvidia driver packages, but it did not seem to make a difference, My xorg.conf file contains the following: # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 280.13 ([email protected]) Wed Jul 27 17:15:58 PDT 2011 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection

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RequestValidation Changes in ASP.NET 4.0

- by Rick Strahl

There’s been a change in the way the ValidateRequest attribute on WebForms works in ASP.NET 4.0. I noticed this today while updating a post on my WebLog all of which contain raw HTML and so all pretty much trigger request validation. I recently upgraded this app from ASP.NET 2.0 to 4.0 and it’s now failing to update posts. At first this was difficult to track down because of custom error handling in my app – the custom error handler traps the exception and logs it with only basic error information so the full detail of the error was initially hidden. After some more experimentation in development mode the error that occurs is the typical ASP.NET validate request error (‘A potentially dangerous Request.Form value was detetected…’) which looks like this in ASP.NET 4.0: At first when I got this I was real perplexed as I didn’t read the entire error message and because my page does have: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="NewEntry.aspx.cs" Inherits="Westwind.WebLog.NewEntry" MasterPageFile="~/App_Templates/Standard/AdminMaster.master" ValidateRequest="false" EnableEventValidation="false" EnableViewState="false" %> WTF? ValidateRequest would seem like it should be enough, but alas in ASP.NET 4.0 apparently that setting alone is no longer enough. Reading the fine print in the error explains that you need to explicitly set the requestValidationMode for the application back to V2.0 in web.config: <httpRuntime executionTimeout="300" requestValidationMode="2.0" /> Kudos for the ASP.NET team for putting up a nice error message that tells me how to fix this problem, but excuse me why the heck would you change this behavior to require an explicit override to an optional and by default disabled page level switch? You’ve just made a relatively simple fix to a solution a nasty morass of hard to discover configuration settings??? The original way this worked was perfectly discoverable via attributes in the page. Now you can set this setting in the page and get completely unexpected behavior and you are required to set what effectively amounts to a backwards compatibility flag in the configuration file. It turns out the real reason for the .config flag is that the request validation behavior has moved from WebForms pipeline down into the entire ASP.NET/IIS request pipeline and is now applied against all requests. Here’s what the breaking changes page from Microsoft says about it: The request validation feature in ASP.NET provides a certain level of default protection against cross-site scripting (XSS) attacks. In previous versions of ASP.NET, request validation was enabled by default. However, it applied only to ASP.NET pages (.aspx files and their class files) and only when those pages were executing. In ASP.NET 4, by default, request validation is enabled for all requests, because it is enabled before the BeginRequest phase of an HTTP request. As a result, request validation applies to requests for all ASP.NET resources, not just .aspx page requests. This includes requests such as Web service calls and custom HTTP handlers. Request validation is also active when custom HTTP modules are reading the contents of an HTTP request. As a result, request validation errors might now occur for requests that previously did not trigger errors. To revert to the behavior of the ASP.NET 2.0 request validation feature, add the following setting in the Web.config file: <httpRuntime requestValidationMode="2.0" /> However, we recommend that you analyze any request validation errors to determine whether existing handlers, modules, or other custom code accesses potentially unsafe HTTP inputs that could be XSS attack vectors. Ok, so ValidateRequest of the form still works as it always has but it’s actually the ASP.NET Event Pipeline, not WebForms that’s throwing the above exception as request validation is applied to every request that hits the pipeline. Creating the runtime override removes the HttpRuntime checking and restores the WebForms only behavior. That fixes my immediate problem but still leaves me wondering especially given the vague wording of the above explanation. One thing that’s missing in the description is above is one important detail: The request validation is applied only to application/x-www-form-urlencoded POST content not to all inbound POST data. When I first read this this freaked me out because it sounds like literally ANY request hitting the pipeline is affected. To make sure this is not really so I created a quick handler: public class Handler1 : IHttpHandler { public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; context.Response.Write("Hello World <hr>" + context.Request.Form.ToString()); } public bool IsReusable { get { return false; } } } and called it with Fiddler by posting some XML to the handler using a default form-urlencoded POST content type: and sure enough – hitting the handler also causes the request validation error and 500 server response. Changing the content type to text/xml effectively fixes the problem however, bypassing the request validation filter so Web Services/AJAX handlers and custom modules/handlers that implement custom protocols aren’t affected as long as they work with special input content types. It also looks that multipart encoding does not trigger event validation of the runtime either so this request also works fine: POST http://rasnote/weblog/handler1.ashx HTTP/1.1 Content-Type: multipart/form-data; boundary=------7cf2a327f01ae User-Agent: West Wind Internet Protocols 5.53 Host: rasnote Content-Length: 40 Pragma: no-cache <xml>asdasd</xml>--------7cf2a327f01ae *That* probably should trigger event validation – since it is a potential HTML form submission, but it doesn’t. New Runtime Feature, Global Scope Only? Ok, so request validation is now a runtime feature but sadly it’s a feature that’s scoped to the ASP.NET Runtime – effective scope to the entire running application/app domain. You can still manually force validation using Request.ValidateInput() which gives you the option to do this in code, but that realistically will only work with the requestValidationMode set to V2.0 as well since the 4.0 mode auto-fires before code ever gets a chance to intercept the call. Given all that, the new setting in ASP.NET 4.0 seems to limit options and makes things more difficult and less flexible. Of course Microsoft gets to say ASP.NET is more secure by default because of it but what good is that if you have to turn off this flag the very first time you need to allow one single request that bypasses request validation??? This is really shortsighted design… <sigh>© Rick Strahl, West Wind Technologies, 2005-2010Posted in ASP.NET

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A simple Dynamic Proxy

- by Abhijeet Patel

Frameworks such as EF4 and MOQ do what most developers consider "dark magic". For instance in EF4, when you use a POCO for an entity you can opt-in to get behaviors such as "lazy-loading" and "change tracking" at runtime merely by ensuring that your type has the following characteristics: The class must be public and not sealed. The class must have a public or protected parameter-less constructor. The class must have public or protected properties Adhere to this and your type is magically endowed with these behaviors without any additional programming on your part. Behind the scenes the framework subclasses your type at runtime and creates a "dynamic proxy" which has these additional behaviors and when you navigate properties of your POCO, the framework replaces the POCO type with derived type instances. The MOQ framework does simlar magic. Let's say you have a simple interface: public interface IFoo { int GetNum(); } We can verify that the GetNum() was invoked on a mock like so: var mock = new Mock<IFoo>(MockBehavior.Default); mock.Setup(f => f.GetNum()); var num = mock.Object.GetNum(); mock.Verify(f => f.GetNum()); Beind the scenes the MOQ framework is generating a dynamic proxy by implementing IFoo at runtime. the call to moq.Object returns the dynamic proxy on which we then call "GetNum" and then verify that this method was invoked. No dark magic at all, just clever programming is what's going on here, just not visible and hence appears magical! Let's create a simple dynamic proxy generator which accepts an interface type and dynamically creates a proxy implementing the interface type specified at runtime. public static class DynamicProxyGenerator { public static T GetInstanceFor<T>() { Type typeOfT = typeof(T); var methodInfos = typeOfT.GetMethods(); AssemblyName assName = new AssemblyName("testAssembly"); var assBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assName, AssemblyBuilderAccess.RunAndSave); var moduleBuilder = assBuilder.DefineDynamicModule("testModule", "test.dll"); var typeBuilder = moduleBuilder.DefineType(typeOfT.Name + "Proxy", TypeAttributes.Public); typeBuilder.AddInterfaceImplementation(typeOfT); var ctorBuilder = typeBuilder.DefineConstructor( MethodAttributes.Public, CallingConventions.Standard, new Type[] { }); var ilGenerator = ctorBuilder.GetILGenerator(); ilGenerator.EmitWriteLine("Creating Proxy instance"); ilGenerator.Emit(OpCodes.Ret); foreach (var methodInfo in methodInfos) { var methodBuilder = typeBuilder.DefineMethod( methodInfo.Name, MethodAttributes.Public | MethodAttributes.Virtual, methodInfo.ReturnType, methodInfo.GetParameters().Select(p => p.GetType()).ToArray() ); var methodILGen = methodBuilder.GetILGenerator(); methodILGen.EmitWriteLine("I'm a proxy"); if (methodInfo.ReturnType == typeof(void)) { methodILGen.Emit(OpCodes.Ret); } else { if (methodInfo.ReturnType.IsValueType || methodInfo.ReturnType.IsEnum) { MethodInfo getMethod = typeof(Activator).GetMethod(/span>"CreateInstance",new Type[]{typeof((Type)}); LocalBuilder lb = methodILGen.DeclareLocal(methodInfo.ReturnType); methodILGen.Emit(OpCodes.Ldtoken, lb.LocalType); methodILGen.Emit(OpCodes.Call, typeofype).GetMethod("GetTypeFromHandle")); )); methodILGen.Emit(OpCodes.Callvirt, getMethod); methodILGen.Emit(OpCodes.Unbox_Any, lb.LocalType); } else { methodILGen.Emit(OpCodes.Ldnull); } methodILGen.Emit(OpCodes.Ret); } typeBuilder.DefineMethodOverride(methodBuilder, methodInfo); } Type constructedType = typeBuilder.CreateType(); var instance = Activator.CreateInstance(constructedType); return (T)instance; } } Dynamic proxies are created by calling into the following main types: AssemblyBuilder, TypeBuilder, Modulebuilder and ILGenerator. These types enable dynamically creating an assembly and emitting .NET modules and types in that assembly, all using IL instructions. Let's break down the code above a bit and examine it piece by piece Type typeOfT = typeof(T); var methodInfos = typeOfT.GetMethods(); AssemblyName assName = new AssemblyName("testAssembly"); var assBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assName, AssemblyBuilderAccess.RunAndSave); var moduleBuilder = assBuilder.DefineDynamicModule("testModule", "test.dll"); var typeBuilder = moduleBuilder.DefineType(typeOfT.Name + "Proxy", TypeAttributes.Public); We are instructing the runtime to create an assembly caled "test.dll"and in this assembly we then emit a new module called "testModule". We then emit a new type definition of name "typeName"Proxy into this new module. This is the definition for the "dynamic proxy" for type T typeBuilder.AddInterfaceImplementation(typeOfT); var ctorBuilder = typeBuilder.DefineConstructor( MethodAttributes.Public, CallingConventions.Standard, new Type[] { }); var ilGenerator = ctorBuilder.GetILGenerator(); ilGenerator.EmitWriteLine("Creating Proxy instance"); ilGenerator.Emit(OpCodes.Ret); The newly created type implements type T and defines a default parameterless constructor in which we emit a call to Console.WriteLine. This call is not necessary but we do this so that we can see first hand that when the proxy is constructed, when our default constructor is invoked. var methodBuilder = typeBuilder.DefineMethod( methodInfo.Name, MethodAttributes.Public | MethodAttributes.Virtual, methodInfo.ReturnType, methodInfo.GetParameters().Select(p => p.GetType()).ToArray() ); We then iterate over each method declared on type T and add a method definition of the same name into our "dynamic proxy" definition if (methodInfo.ReturnType == typeof(void)) { methodILGen.Emit(OpCodes.Ret); } If the return type specified in the method declaration of T is void we simply return. if (methodInfo.ReturnType.IsValueType || methodInfo.ReturnType.IsEnum) { MethodInfo getMethod = typeof(Activator).GetMethod("CreateInstance", new Type[]{typeof(Type)}); LocalBuilder lb = methodILGen.DeclareLocal(methodInfo.ReturnType); methodILGen.Emit(OpCodes.Ldtoken, lb.LocalType); methodILGen.Emit(OpCodes.Call, typeof(Type).GetMethod("GetTypeFromHandle")); methodILGen.Emit(OpCodes.Callvirt, getMethod); methodILGen.Emit(OpCodes.Unbox_Any, lb.LocalType); } If the return type in the method declaration of T is either a value type or an enum, then we need to create an instance of the value type and return that instance the caller. In order to accomplish that we need to do the following: 1) Get a handle to the Activator.CreateInstance method 2) Declare a local variable which represents the Type of the return type(i.e the type object of the return type) specified on the method declaration of T(obtained from the MethodInfo) and push this Type object onto the evaluation stack. In reality a RuntimeTypeHandle is what is pushed onto the stack. 3) Invoke the "GetTypeFromHandle" method(a static method in the Type class) passing in the RuntimeTypeHandle pushed onto the stack previously as an argument, the result of this invocation is a Type object (representing the method's return type) which is pushed onto the top of the evaluation stack. 4) Invoke Activator.CreateInstance passing in the Type object from step 3, the result of this invocation is an instance of the value type boxed as a reference type and pushed onto the top of the evaluation stack. 5) Unbox the result and place it into the local variable of the return type defined in step 2 methodILGen.Emit(OpCodes.Ldnull); If the return type is a reference type then we just load a null onto the evaluation stack methodILGen.Emit(OpCodes.Ret); Emit a a return statement to return whatever is on top of the evaluation stack(null or an instance of a value type) back to the caller Type constructedType = typeBuilder.CreateType(); var instance = Activator.CreateInstance(constructedType); return (T)instance; Now that we have a definition of the "dynamic proxy" implementing all the methods declared on T, we can now create an instance of the proxy type and return that out typed as T. The caller can now invoke the generator and request a dynamic proxy for any type T. In our example when the client invokes GetNum() we get back "0". Lets add a new method on the interface called DayOfWeek GetDay() public interface IFoo { int GetNum(); DayOfWeek GetDay(); } When GetDay() is invoked, the "dynamic proxy" returns "Sunday" since that is the default value for the DayOfWeek enum This is a very trivial example of dynammic proxies, frameworks like MOQ have a way more sophisticated implementation of this paradigm where in you can instruct the framework to create proxies which return specified values for a method implementation.

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Nashorn, the rhino in the room

- by costlow

Nashorn is a new runtime within JDK 8 that allows developers to run code written in JavaScript and call back and forth with Java. One advantage to the Nashorn scripting engine is that is allows for quick prototyping of functionality or basic shell scripts that use Java libraries. The previous JavaScript runtime, named Rhino, was introduced in JDK 6 (released 2006, end of public updates Feb 2013). Keeping tradition amongst the global developer community, "Nashorn" is the German word for rhino. The Java platform and runtime is an intentional home to many languages beyond the Java language itself. OpenJDK’s Da Vinci Machine helps coordinate work amongst language developers and tool designers and has helped different languages by introducing the Invoke Dynamic instruction in Java 7 (2011), which resulted in two major benefits: speeding up execution of dynamic code, and providing the groundwork for Java 8’s lambda executions. Many of these improvements are discussed at the JVM Language Summit, where language and tool designers get together to discuss experiences and issues related to building these complex components. There are a number of benefits to running JavaScript applications on JDK 8’s Nashorn technology beyond writing scripts quickly: Interoperability with Java and JavaScript libraries. Scripts do not need to be compiled. Fast execution and multi-threading of JavaScript running in Java’s JRE. The ability to remotely debug applications using an IDE like NetBeans, Eclipse, or IntelliJ (instructions on the Nashorn blog). Automatic integration with Java monitoring tools, such as performance, health, and SIEM. In the remainder of this blog post, I will explain how to use Nashorn and the benefit from those features. Nashorn execution environment The Nashorn scripting engine is included in all versions of Java SE 8, both the JDK and the JRE. Unlike Java code, scripts written in nashorn are interpreted and do not need to be compiled before execution. Developers and users can access it in two ways: Users running JavaScript applications can call the binary directly:jre8/bin/jjs This mechanism can also be used in shell scripts by specifying a shebang like #!/usr/bin/jjs Developers can use the API and obtain a ScriptEngine through:ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn"); When using a ScriptEngine, please understand that they execute code. Avoid running untrusted scripts or passing in untrusted/unvalidated inputs. During compilation, consider isolating access to the ScriptEngine and using Type Annotations to only allow @Untainted String arguments. One noteworthy difference between JavaScript executed in or outside of a web browser is that certain objects will not be available. For example when run outside a browser, there is no access to a document object or DOM tree. Other than that, all syntax, semantics, and capabilities are present. Examples of Java and JavaScript The Nashorn script engine allows developers of all experience levels the ability to write and run code that takes advantage of both languages. The specific dialect is ECMAScript 5.1 as identified by the User Guide and its standards definition through ECMA international. In addition to the example below, Benjamin Winterberg has a very well written Java 8 Nashorn Tutorial that provides a large number of code samples in both languages. Basic Operations A basic Hello World application written to run on Nashorn would look like this: #!/usr/bin/jjs print("Hello World"); The first line is a standard script indication, so that Linux or Unix systems can run the script through Nashorn. On Windows where scripts are not as common, you would run the script like: jjs helloWorld.js. Receiving Arguments In order to receive program arguments your jjs invocation needs to use the -scripting flag and a double-dash to separate which arguments are for jjs and which are for the script itself:jjs -scripting print.js -- "This will print" #!/usr/bin/jjs var whatYouSaid = $ARG.length==0 ? "You did not say anything" : $ARG[0] print(whatYouSaid); Interoperability with Java libraries (including 3rd party dependencies) Another goal of Nashorn was to allow for quick scriptable prototypes, allowing access into Java types and any libraries. Resources operate in the context of the script (either in-line with the script or as separate threads) so if you open network sockets and your script terminates, those sockets will be released and available for your next run. Your code can access Java types the same as regular Java classes. The “import statements” are written somewhat differently to accommodate for language. There is a choice of two styles: For standard classes, just name the class: var ServerSocket = java.net.ServerSocket For arrays or other items, use Java.type: var ByteArray = Java.type("byte[]")You could technically do this for all. The same technique will allow your script to use Java types from any library or 3rd party component and quickly prototype items. Building a user interface One major difference between JavaScript inside and outside of a web browser is the availability of a DOM object for rendering views. When run outside of the browser, JavaScript has full control to construct the entire user interface with pre-fabricated UI controls, charts, or components. The example below is a variation from the Nashorn and JavaFX guide to show how items work together. Nashorn has a -fx flag to make the user interface components available. With the example script below, just specify: jjs -fx -scripting fx.js -- "My title" #!/usr/bin/jjs -fx var Button = javafx.scene.control.Button; var StackPane = javafx.scene.layout.StackPane; var Scene = javafx.scene.Scene; var clickCounter=0; $STAGE.title = $ARG.length>0 ? $ARG[0] : "You didn't provide a title"; var button = new Button(); button.text = "Say 'Hello World'"; button.onAction = myFunctionForButtonClicking; var root = new StackPane(); root.children.add(button); $STAGE.scene = new Scene(root, 300, 250); $STAGE.show(); function myFunctionForButtonClicking(){ var text = "Click Counter: " + clickCounter; button.setText(text); clickCounter++; print(text); } For a more advanced post on using Nashorn to build a high-performing UI, see JavaFX with Nashorn Canvas example. Interoperable with frameworks like Node, Backbone, or Facebook React The major benefit of any language is the interoperability gained by people and systems that can read, write, and use it for interactions. Because Nashorn is built for the ECMAScript specification, developers familiar with JavaScript frameworks can write their code and then have system administrators deploy and monitor the applications the same as any other Java application. A number of projects are also running Node applications on Nashorn through Project Avatar and the supported modules. In addition to the previously mentioned Nashorn tutorial, Benjamin has also written a post about Using Backbone.js with Nashorn. To show the multi-language power of the Java Runtime, there is another interesting example that unites Facebook React and Clojure on JDK 8’s Nashorn. Summary Nashorn provides a simple and fast way of executing JavaScript applications and bridging between the best of each language. By making the full range of Java libraries to JavaScript applications, and the quick prototyping style of JavaScript to Java applications, developers are free to work as they see fit. Software Architects and System Administrators can take advantage of one runtime and leverage any work that they have done to tune, monitor, and certify their systems. Additional information is available within: The Nashorn Users’ Guide Java Magazine’s article "Next Generation JavaScript Engine for the JVM." The Nashorn team’s primary blog or a very helpful collection of Nashorn links.

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elffile: ELF Specific File Identification Utility

- by user9154181

Solaris 11 has a new standard user level command, /usr/bin/elffile. elffile is a variant of the file utility that is focused exclusively on linker related files: ELF objects, archives, and runtime linker configuration files. All other files are simply identified as "non-ELF". The primary advantage of elffile over the existing file utility is in the area of archives — elffile examines the archive members and can produce a summary of the contents, or per-member details. The impetus to add elffile to Solaris came from the effort to extend the format of Solaris archives so that they could grow beyond their previous 32-bit file limits. That work introduced a new archive symbol table format. Now that there was more than one possible format, I thought it would be useful if the file utility could identify which format a given archive is using, leading me to extend the file utility: % cc -c ~/hello.c % ar r foo.a hello.o % file foo.a foo.a: current ar archive, 32-bit symbol table % ar r -S foo.a hello.o % file foo.a foo.a: current ar archive, 64-bit symbol table In turn, this caused me to think about all the things that I would like the file utility to be able to tell me about an archive. In particular, I'd like to be able to know what's inside without having to unpack it. The end result of that train of thought was elffile. Much of the discussion in this article is adapted from the PSARC case I filed for elffile in December 2010: PSARC 2010/432 elffile Why file Is No Good For Archives And Yet Should Not Be Fixed The standard /usr/bin/file utility is not very useful when applied to archives. When identifying an archive, a user typically wants to know 2 things: Is this an archive? Presupposing that the archive contains objects, which is by far the most common use for archives, what platform are the objects for? Are they for sparc or x86? 32 or 64-bit? Some confusing combination from varying platforms? The file utility provides a quick answer to question (1), as it identifies all archives as "current ar archive". It does nothing to answer the more interesting question (2). To answer that question, requires a multi-step process: Extract all archive members Use the file utility on the extracted files, examine the output for each file in turn, and compare the results to generate a suitable summary description. Remove the extracted files It should be easier and more efficient to answer such an obvious question. It would be reasonable to extend the file utility to examine archive contents in place and produce a description. However, there are several reasons why I decided not to do so: The correct design for this feature within the file utility would have file examine each archive member in turn, applying its full abilities to each member. This would be elegant, but also represents a rather dramatic redesign and re-implementation of file. Archives nearly always contain nothing but ELF objects for a single platform, so such generality in the file utility would be of little practical benefit. It is best to avoid adding new options to standard utilities for which other implementations of interest exist. In the case of the file utility, one concern is that we might add an option which later appears in the GNU version of file with a different and incompatible meaning. Indeed, there have been discussions about replacing the Solaris file with the GNU version in the past. This may or may not be desirable, and may or may not ever happen. Either way, I don't want to preclude it. Examining archive members is an O(n) operation, and can be relatively slow with large archives. The file utility is supposed to be a very fast operation. I decided that extending file in this way is overkill, and that an investment in the file utility for better archive support would not be worth the cost. A solution that is more narrowly focused on ELF and other linker related files is really all that we need. The necessary code for doing this already exists within libelf. All that is missing is a small user-level wrapper to make that functionality available at the command line. In that vein, I considered adding an option for this to the elfdump utility. I examined elfdump carefully, and even wrote a prototype implementation. The added code is small and simple, but the conceptual fit with the rest of elfdump is poor. The result complicates elfdump syntax and documentation, definite signs that this functionality does not belong there. And so, I added this functionality as a new user level command. The elffile Command The syntax for this new command is elffile [-s basic | detail | summary] filename... Please see the elffile(1) manpage for additional details. To demonstrate how output from elffile looks, I will use the following files: FileDescription configA runtime linker configuration file produced with crle dwarf.oAn ELF object /etc/passwdA text file mixed.aArchive containing a mixture of ELF and non-ELF members mixed_elf.aArchive containing ELF objects for different machines not_elf.aArchive containing no ELF objects same_elf.aArchive containing a collection of ELF objects for the same machine. This is the most common type of archive. The file utility identifies these files as follows: % file config dwarf.o /etc/passwd mixed.a mixed_elf.a not_elf.a same_elf.a config: Runtime Linking Configuration 64-bit MSB SPARCV9 dwarf.o: ELF 64-bit LSB relocatable AMD64 Version 1 /etc/passwd: ascii text mixed.a: current ar archive, 32-bit symbol table mixed_elf.a: current ar archive, 32-bit symbol table not_elf.a: current ar archive same_elf.a: current ar archive, 32-bit symbol table By default, elffile uses its "summary" output style. This output differs from the output from the file utility in 2 significant ways: Files that are not an ELF object, archive, or runtime linker configuration file are identified as "non-ELF", whereas the file utility attempts further identification for such files. When applied to an archive, the elffile output includes a description of the archive's contents, without requiring member extraction or other additional steps. Applying elffile to the above files: % elffile config dwarf.o /etc/passwd mixed.a mixed_elf.a not_elf.a same_elf.a config: Runtime Linking Configuration 64-bit MSB SPARCV9 dwarf.o: ELF 64-bit LSB relocatable AMD64 Version 1 /etc/passwd: non-ELF mixed.a: current ar archive, 32-bit symbol table, mixed ELF and non-ELF content mixed_elf.a: current ar archive, 32-bit symbol table, mixed ELF content not_elf.a: current ar archive, non-ELF content same_elf.a: current ar archive, 32-bit symbol table, ELF 64-bit LSB relocatable AMD64 Version 1 The output for same_elf.a is of particular interest: The vast majority of archives contain only ELF objects for a single platform, and in this case, the default output from elffile answers both of the questions about archives posed at the beginning of this discussion, in a single efficient step. This makes elffile considerably more useful than file, within the realm of linker-related files. elffile can produce output in two other styles, "basic", and "detail". The basic style produces output that is the same as that from 'file', for linker-related files. The detail style produces per-member identification of archive contents. This can be useful when the archive contents are not homogeneous ELF object, and more information is desired than the summary output provides: % elffile -s detail mixed.a mixed.a: current ar archive, 32-bit symbol table mixed.a(dwarf.o): ELF 32-bit LSB relocatable 80386 Version 1 mixed.a(main.c): non-ELF content mixed.a(main.o): ELF 64-bit LSB relocatable AMD64 Version 1 [SSE]

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"apt-get -f install" fails with "/usr/bin/dpkg returned an error code (1)"

- by parsley72

I started out trying to install CVS: $ sudo apt-get install cvs Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: libcups2 : Breaks: libcups2:i386 (!= 1.5.3-0ubuntu3) but 1.5.3-0ubuntu4 is to be installed libcups2:i386 : Breaks: libcups2 (!= 1.5.3-0ubuntu4) but 1.5.3-0ubuntu3 is to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). But when I try this I get: $ sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following package was automatically installed and is no longer required: tzdata-java Use 'apt-get autoremove' to remove them. The following extra packages will be installed: libcups2 The following packages will be upgraded: libcups2 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 14 not fully installed or removed. Need to get 0 B/172 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? y dpkg: error processing libcups2 (--configure): libcups2:amd64 1.5.3-0ubuntu3 cannot be configured because libcups2:i386 is in a different version (1.5.3-0ubuntu4) dpkg: error processing libcups2:i386 (--configure): libcups2:i386 1.5.3-0ubuntu4 cannot be configured because libcups2:amd64 is in a different version (1.5.3-0ubuntu3) dpkg: dependency problems prevent configuration of libcupsmime1: libcupsmime1 depends on libcups2 (>= 1.5~); however: Package libcups2 is not configured yet. dpkg: error processing libcupsmime1 (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of libcupscgi1: libcupscgi1 depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. dpkg: error processing libcupscgi1 (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of libcupsppdc1: libcupsppdc1 depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. dpkg: error processing libcupsppdc1 (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of cups-client: cups-client depends on libcups2 (>= 1.5.0); however: Package libcups2 is not configured yet. dpkg: error processing cups-client (--configure): dependency problems - leaviNo apport report written because the error message indicates its a followup error from a previous failure. No apport report written because the error message indicates its a followup error from a previous failure. No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already No apport report written because MaxReports is reached already ng unconfigured dpkg: dependency problems prevent configuration of cups-ppdc: cups-ppdc depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. cups-ppdc depends on libcupsppdc1 (>= 1.4.0); however: Package libcupsppdc1 is not configured yet. dpkg: error processing cups-ppdc (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of cups: cups depends on libcups2 (>= 1.5.0); however: Package libcups2 is not configured yet. cups depends on libcupscgi1 (>= 1.4.2); however: Package libcupscgi1 is not configured yet. cups depends on libcupsmime1 (>= 1.5.0); however: Package libcupsmime1 is not configured yet. cups depends on libcupsppdc1 (>= 1.4.0); however: Package libcupsppdc1 is not configured yet. cups depends on cups-client (>= 1.5.3-0ubuntu4); however: Package cups-client is not configured yet. cups depends on cups-ppdc; however: Package cups-ppdc is not configured yet. dpkg: error processing cups (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of libcupsdriver1: libcupsdriver1 depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. dpkg: error processing libcupsdriver1 (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of openjdk-7-jre-headless: openjdk-7-jre-headless depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. dpkg: error processing openjdk-7-jre-headless (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of openjdk-7-jre: openjdk-7-jre depends on openjdk-7-jre-headless (= 7u7-2.3.2-1ubuntu0.12.04.1); however: Package openjdk-7-jre-headless is not configured yet. openjdk-7-jre depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. dpkg: error processing openjdk-7-jre (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of cups-bsd: cups-bsd depends on libcups2 (>= 1.4.0); however: Package libcups2 is not configured yet. cups-bsd depends on cups-client (= 1.5.3-0ubuntu4); however: Package cups-client is not configured yet. dpkg: error processing cups-bsd (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of icedtea-7-jre-jamvm: icedtea-7-jre-jamvm depends on openjdk-7-jre-headless (= 7u7-2.3.2-1ubuntu0.12.04.1); however: Package openjdk-7-jre-headless is not configured yet. dpkg: error processing icedtea-7-jre-jamvm (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of openjdk-7-jre-lib: openjdk-7-jre-lib depends on openjdk-7-jre-headless (>= 7~b130~pre0); however: Package openjdk-7-jre-headless is not configured yet. dpkg: error processing openjdk-7-jre-lib (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: libcups2 libcups2:i386 libcupsmime1 libcupscgi1 libcupsppdc1 cups-client cups-ppdc cups libcupsdriver1 openjdk-7-jre-headless openjdk-7-jre cups-bsd icedtea-7-jre-jamvm openjdk-7-jre-lib E: Sub-process /usr/bin/dpkg returned an error code (1) I've done "apt-get update" and "apt-get upgrade" and this hasn't fixed the problem: $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: libcups2 : Breaks: libcups2:i386 (!= 1.5.3-0ubuntu3) but 1.5.3-0ubuntu4 is installed libcups2:i386 : Breaks: libcups2 (!= 1.5.3-0ubuntu4) but 1.5.3-0ubuntu3 is installed E: Unmet dependencies. Try using -f.

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A plugin is preventing Eclipse from starting up

- by Mahmoud Hossam

It just gives me a blank window, and the splash screen doesn't go away. I tried running it in a terminal, turns out it's a problematic plugin. Is there a way to disable that plugin without the GUI? There's the error log: [org.eclipse.contribution.weaving.jdt] error at org/eclipse/contribution/jdt/IsWovenTester.aj::0 class 'org.eclipse.contribution.jdt.IsWovenTester' is already woven and has not been built in reweavable mode [org.eclipse.contribution.weaving.jdt] error at org/eclipse/contribution/jdt/IsWovenTester.aj::0 class 'org.eclipse.contribution.jdt.IsWovenTester$WeavingMarker' is already woven and has not been built in reweavable mode [org.eclipse.jdt.core] warning at org/eclipse/contribution/jdt/sourceprovider/SourceTransformerAspect.aj:106::0 does not match because declaring type is org.eclipse.jdt.core.IOpenable, if match desired use target(org.eclipse.jdt.core.ICompilationUnit) [Xlint:unmatchedSuperTypeInCall] see also: org/eclipse/jdt/internal/core/SourceRefElement.java:198::0 [org.eclipse.jdt.ui] warning at org/eclipse/contribution/jdt/sourceprovider/SourceTransformerAspect.aj:106::0 does not match because declaring type is org.eclipse.jdt.core.ITypeRoot, if match desired use target(org.eclipse.jdt.core.ICompilationUnit) [Xlint:unmatchedSuperTypeInCall] see also: org/eclipse/jdt/internal/ui/javaeditor/ASTProvider.java:572::0 [org.eclipse.contribution.weaving.jdt] error at org/eclipse/contribution/jdt/sourceprovider/SourceTransformerAspect.aj::0 class 'org.eclipse.contribution.jdt.sourceprovider.SourceTransformerAspect' is already woven and has not been built in reweavable mode [org.eclipse.contribution.weaving.jdt] error at org/eclipse/contribution/jdt/cuprovider/CompilationUnitProviderAspect.aj::0 class 'org.eclipse.contribution.jdt.cuprovider.CompilationUnitProviderAspect' is already woven and has not been built in reweavable mode [ScalaPlugin] [scalaLibBundle] Found 0 bundles: LogFilter.isLoggable threw a non-fatal unchecked exception as follows: java.lang.NullPointerException at org.eclipse.core.internal.runtime.Log.isLoggable(Log.java:101) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.safeIsLoggable(ExtendedLogReaderServiceFactory.java:59) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.logPrivileged(ExtendedLogReaderServiceFactory.java:164) at org.eclipse.equinox.log.internal.ExtendedLogReaderServiceFactory.log(ExtendedLogReaderServiceFactory.java:150) at org.eclipse.equinox.log.internal.ExtendedLogServiceFactory.log(ExtendedLogServiceFactory.java:65) at org.eclipse.equinox.log.internal.ExtendedLogServiceImpl.log(ExtendedLogServiceImpl.java:87) at org.eclipse.equinox.log.internal.LoggerImpl.log(LoggerImpl.java:54) at org.eclipse.core.internal.runtime.Log.log(Log.java:60) at scala.tools.eclipse.util.DefaultLogger.warning(DefaultLogger.scala:46) at scala.tools.eclipse.ScalaPlugin$$anonfun$3.apply(ScalaPlugin.scala:131) at scala.tools.eclipse.ScalaPlugin$$anonfun$3.apply(ScalaPlugin.scala:130) at scala.Option.getOrElse(Option.scala:108) at scala.tools.eclipse.ScalaPlugin.<init>(ScalaPlugin.scala:130) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at java.lang.Class.newInstance0(Class.java:372) at java.lang.Class.newInstance(Class.java:325) at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:166) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:679) at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381) at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299) at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440) at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268) at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400) at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:345) at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229) at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1207) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55) at org.eclipse.contribution.jdt.cuprovider.CompilationUnitProviderRegistry.registerProviders(CompilationUnitProviderRegistry.java:69) at org.eclipse.contribution.jdt.cuprovider.CompilationUnitProviderRegistry.getProvider(CompilationUnitProviderRegistry.java:46) at org.eclipse.contribution.jdt.cuprovider.CompilationUnitProviderAspect.ajc$inlineAccessMethod$org_eclipse_contribution_jdt_cuprovider_CompilationUnitProviderAspect$org_eclipse_contribution_jdt_cuprovider_CompilationUnitProviderRegistry$getProvider(CompilationUnitProviderAspect.aj:1) at org.eclipse.jdt.internal.core.PackageFragment.init$_aroundBody7$advice(PackageFragment.java:47) at org.eclipse.jdt.internal.core.PackageFragment.getCompilationUnit(PackageFragment.java:216) at org.eclipse.jdt.internal.core.JavaModelManager.createCompilationUnitFrom(JavaModelManager.java:962) at org.eclipse.jdt.internal.core.JavaModelManager.create(JavaModelManager.java:871) at org.eclipse.jdt.core.JavaCore.create(JavaCore.java:2622) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.createCompilationUnit(CompilationUnitDocumentProvider.java:941) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.createFileInfo(CompilationUnitDocumentProvider.java:974) at org.eclipse.ui.editors.text.TextFileDocumentProvider.connect(TextFileDocumentProvider.java:478) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.connect(CompilationUnitDocumentProvider.java:1243) at org.eclipse.ui.texteditor.AbstractTextEditor.doSetInput(AbstractTextEditor.java:4213) at org.eclipse.ui.texteditor.StatusTextEditor.doSetInput(StatusTextEditor.java:237) at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.doSetInput(AbstractDecoratedTextEditor.java:1451) at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.internalDoSetInput(JavaEditor.java:2563) at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.doSetInput(JavaEditor.java:2536) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSetInput(CompilationUnitEditor.java:1395) at org.eclipse.ui.texteditor.AbstractTextEditor$19.run(AbstractTextEditor.java:3200) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372) at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:759) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:756) at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2642) at org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3218) at org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3245) at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:828) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:647) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595) at org.eclipse.ui.internal.EditorAreaHelper.setVisibleEditor(EditorAreaHelper.java:271) at org.eclipse.ui.internal.EditorManager.setVisibleEditor(EditorManager.java:1459) at org.eclipse.ui.internal.EditorManager$5.runWithException(EditorManager.java:972) at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212) at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803) at org.eclipse.ui.internal.Workbench$33.runWithException(Workbench.java:1595) at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386) [StartupDiagnostics$] startup diagnostics: previous version = 2.0.0.rc01-2_09-201111091447-ce49e0a [StartupDiagnostics$] startup diagnostics: CURRENT version = 2.0.0.rc01-2_09-201111091447-ce49e0a [ScalaPlugin] Scala compiler bundle: reference:file:plugins/org.scala-ide.scala.compiler_2.9.2.r25964-b20111108034957.jar [org.eclipse.jdt.core] warning at org/eclipse/contribution/jdt/sourceprovider/SourceTransformerAspect.aj:106::0 does not match because declaring type is org.eclipse.jdt.core.IOpenable, if match desired use target(org.eclipse.jdt.core.ICompilationUnit) [Xlint:unmatchedSuperTypeInCall] see also: org/eclipse/jdt/internal/core/LocalVariable.java:363::0 [org.eclipse.contribution.weaving.jdt] error at org/eclipse/contribution/jdt/imagedescriptor/ImageDescriptorSelectorAspect.aj::0 class 'org.eclipse.contribution.jdt.imagedescriptor.ImageDescriptorSelectorAspect' is already woven and has not been built in reweavable mode [org.eclipse.jdt.ui] warning at org/eclipse/contribution/jdt/sourceprovider/SourceTransformerAspect.aj:106::0 does not match because declaring type is org.eclipse.jdt.core.IOpenable, if match desired use target(org.eclipse.jdt.core.ICompilationUnit) [Xlint:unmatchedSuperTypeInCall] see also: org/eclipse/jdt/internal/ui/text/java/hover/JavadocHover.java:630::0 [org.eclipse.contribution.weaving.jdt] error at org/eclipse/contribution/jdt/itdawareness/ITDAwarenessAspect.aj::0 class 'org.eclipse.contribution.jdt.itdawareness.ITDAwarenessAspect' is already woven and has not been built in reweavable mode [ScalaPlugin] open Ride.java

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Error when Eclipse started and now my package explorer is empty!

- by carpenteri

Friends, Just a quick introduction, I'm currently learning Java, using a combination of the Head First Java book and Eclipse. Everything was going well until tonight! When I started up Eclipse tonight, I saw an error message which I didn't pay attention to (I know! I know!) and acknowledged after which the project explorer was empty where it used to contain my Head First project! After a quick "google" I found the workspace.metadata.log and the errors are shown below. The version of Eclipse I am using is: 20100218-1602 and the only plugin that I use is egit. Any help would be much appreciated. Thanks !SESSION 2010-06-08 19:24:33.841 ----------------------------------------------- eclipse.buildId=unknown java.version=1.5.0_22 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_GB Framework arguments: -product org.eclipse.epp.package.java.product Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.java.product !ENTRY org.eclipse.ui.workbench 4 2 2010-06-08 19:24:36.475 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench". !STACK 1 org.eclipse.ui.WorkbenchException: Content is not allowed in prolog. at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:121) at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:64) at org.eclipse.ui.internal.Workbench$49.run(Workbench.java:1895) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.Workbench.restoreState(Workbench.java:1890) at org.eclipse.ui.internal.WorkbenchConfigurer.restoreState(WorkbenchConfigurer.java:183) at org.eclipse.ui.application.WorkbenchAdvisor$1.run(WorkbenchAdvisor.java:781) Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:94) ... 6 more !SUBENTRY 1 org.eclipse.ui 4 0 2010-06-08 19:24:36.475 !MESSAGE Content is not allowed in prolog. !STACK 0 org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:94) at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:64) at org.eclipse.ui.internal.Workbench$49.run(Workbench.java:1895) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.Workbench.restoreState(Workbench.java:1890) at org.eclipse.ui.internal.WorkbenchConfigurer.restoreState(WorkbenchConfigurer.java:183) at org.eclipse.ui.application.WorkbenchAdvisor$1.run(WorkbenchAdvisor.java:781) !SUBENTRY 1 org.eclipse.ui 4 0 2010-06-08 19:24:36.475 !MESSAGE Content is not allowed in prolog. !STACK 0 org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:94) at org.eclipse.ui.XMLMemento.createReadRoot(XMLMemento.java:64) at org.eclipse.ui.internal.Workbench$49.run(Workbench.java:1895) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.Workbench.restoreState(Workbench.java:1890) at org.eclipse.ui.internal.WorkbenchConfigurer.restoreState(WorkbenchConfigurer.java:183) at org.eclipse.ui.application.WorkbenchAdvisor$1.run(WorkbenchAdvisor.java:781) !ENTRY org.eclipse.jdt.ui 4 10001 2010-06-08 19:24:41.442 !MESSAGE Internal Error !STACK 1 org.eclipse.jdt.internal.ui.JavaUIException: Problems reading information from XML 'OpenTypeHistory.xml' at org.eclipse.jdt.internal.corext.util.History.createException(History.java:70) at org.eclipse.jdt.internal.corext.util.History.load(History.java:257) at org.eclipse.jdt.internal.corext.util.History.load(History.java:166) at org.eclipse.jdt.internal.corext.util.OpenTypeHistory.<init>(OpenTypeHistory.java:199) at org.eclipse.jdt.internal.corext.util.OpenTypeHistory.getInstance(OpenTypeHistory.java:185) at org.eclipse.jdt.internal.ui.JavaPlugin.initializeAfterLoad(JavaPlugin.java:381) at org.eclipse.jdt.internal.ui.InitializeAfterLoadJob$RealJob.run(InitializeAfterLoadJob.java:36) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.jdt.internal.corext.util.History.load(History.java:255) ... 6 more !SUBENTRY 1 org.eclipse.jdt.ui 4 4 2010-06-08 19:24:41.442 !MESSAGE Problems reading information from XML 'OpenTypeHistory.xml' !STACK 0 org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.jdt.internal.corext.util.History.load(History.java:255) at org.eclipse.jdt.internal.corext.util.History.load(History.java:166) at org.eclipse.jdt.internal.corext.util.OpenTypeHistory.<init>(OpenTypeHistory.java:199) at org.eclipse.jdt.internal.corext.util.OpenTypeHistory.getInstance(OpenTypeHistory.java:185) at org.eclipse.jdt.internal.ui.JavaPlugin.initializeAfterLoad(JavaPlugin.java:381) at org.eclipse.jdt.internal.ui.InitializeAfterLoadJob$RealJob.run(InitializeAfterLoadJob.java:36) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) !ENTRY org.eclipse.jdt.ui 4 10001 2010-06-08 19:24:50.435 !MESSAGE Internal Error !STACK 1 org.eclipse.jdt.internal.ui.JavaUIException: Problems reading information from XML 'QualifiedTypeNameHistory.xml' at org.eclipse.jdt.internal.corext.util.History.createException(History.java:70) at org.eclipse.jdt.internal.corext.util.History.load(History.java:257) at org.eclipse.jdt.internal.corext.util.History.load(History.java:166) at org.eclipse.jdt.internal.corext.util.QualifiedTypeNameHistory.<init>(QualifiedTypeNameHistory.java:33) at org.eclipse.jdt.internal.corext.util.QualifiedTypeNameHistory.getDefault(QualifiedTypeNameHistory.java:26) at org.eclipse.jdt.internal.ui.JavaPlugin.stop(JavaPlugin.java:602) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:843) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.stop(BundleContextImpl.java:836) at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(BundleHost.java:474) at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(AbstractBundle.java:546) at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Framework.java:1098) at org.eclipse.osgi.framework.internal.core.StartLevelManager.decFWSL(StartLevelManager.java:593) at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:261) at org.eclipse.osgi.framework.internal.core.StartLevelManager.shutdown(StartLevelManager.java:216) at org.eclipse.osgi.framework.internal.core.InternalSystemBundle.suspend(InternalSystemBundle.java:266) at org.eclipse.osgi.framework.internal.core.Framework.shutdown(Framework.java:685) at org.eclipse.osgi.framework.internal.core.Framework.close(Framework.java:583) at org.eclipse.core.runtime.adaptor.EclipseStarter.shutdown(EclipseStarter.java:409) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:200) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:592) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311) Caused by: org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.jdt.internal.corext.util.History.load(History.java:255) ... 25 more !SUBENTRY 1 org.eclipse.jdt.ui 4 4 2010-06-08 19:24:50.435 !MESSAGE Problems reading information from XML 'QualifiedTypeNameHistory.xml' !STACK 0 org.xml.sax.SAXParseException: Content is not allowed in prolog. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.eclipse.jdt.internal.corext.util.History.load(History.java:255) at org.eclipse.jdt.internal.corext.util.History.load(History.java:166) at org.eclipse.jdt.internal.corext.util.QualifiedTypeNameHistory.<init>(QualifiedTypeNameHistory.java:33) at org.eclipse.jdt.internal.corext.util.QualifiedTypeNameHistory.getDefault(QualifiedTypeNameHistory.java:26) at org.eclipse.jdt.internal.ui.JavaPlugin.stop(JavaPlugin.java:602) at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:843) at java.security.AccessController.doPrivileged(Native Method) at org.eclipse.osgi.framework.internal.core.BundleContextImpl.stop(BundleContextImpl.java:836) at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(BundleHost.java:474) at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(AbstractBundle.java:546) at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Framework.java:1098) at org.eclipse.osgi.framework.internal.core.StartLevelManager.decFWSL(StartLevelManager.java:593) at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:261) at org.eclipse.osgi.framework.internal.core.StartLevelManager.shutdown(StartLevelManager.java:216) at org.eclipse.osgi.framework.internal.core.InternalSystemBundle.suspend(InternalSystemBundle.java:266) at org.eclipse.osgi.framework.internal.core.Framework.shutdown(Framework.java:685) at org.eclipse.osgi.framework.internal.core.Framework.close(Framework.java:583) at org.eclipse.core.runtime.adaptor.EclipseStarter.shutdown(EclipseStarter.java:409) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:200) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:592) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

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