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• Making an asynchronous interface appear synchronous to mod_python users

  - by Trey

  I have a Python-driven web interface powered by Apache 2.2 with mod_python and Python 2.4. I need to make an asynchronous process appear synchronous to users of this web interface. When users access one module on this website: An external SOAP interface will be contacted with a unique identifier and will respond with a number N The external interface will respond asynchronously by contacting a SOAP server on my machine between 1 and 10 times (the number N tells us how many responses we will receive) I need to somehow aggregate these responses and pass them to the original module which will display the information back to the user. The goal is to make the process appear synchronous to the user. What is the best way to handle this synchronization issue? Is this something Twisted would be well-suited for? I am not restricting myself to Python for the solution, though it is preferred because everything else on the server is in Python. I prefer a solution that is both scalable and will take a minimal amount of programming time (though I understand that these attributes are somewhat at odds).

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• How to merge branches in Git by "hunk"

  - by user1316464

  Here's the scenario. I made a "dev" branch off the "master" branch and made a few new commits. Some of those changes are going to only be relevant to my local development machine. For example I changed a URL variable to point to a local apache server instead of the real URL that's posted online (I did this for speed during the testing phase). Now I'd like to incorporate my changes from the dev branch into the master branch but NOT those changes which only make sense in my local environment. I'd envisioned something like a merge --patch which would allow me to choose the changes I want to merge line by line. Alternatively maybe I could checkout the "master" branch, but keep the files in my working directory as they were in the "dev" branch, then do a git add --patch. Would that work?

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• Behavior of nested finally in Exceptions

  - by kuriouscoder

  Hello: Today at work, I had to review a code snippet that looks similar to this mock example. package test; import java.io.IOException; import org.apache.log4j.Logger; public class ExceptionTester { public static Logger logger = Logger.getLogger(ExceptionTester.class); public void test() throws IOException { new IOException(); } public static void main(String[] args) { ExceptionTester comparator = new ExceptionTester(); try { try { comparator.test(); } finally { System.out.println("Finally 1"); } } catch(IOException ex) { logger.error("Exception happened" ex); // also close opened resources } System.out.println("Exiting out of the program"); } } It's printing the following output.I expected an compile error since the inner try did not have a catch block. Finally 1 Exiting out of the program I do not understand why IOException is caught by the outer catch block. I would appreciate if anyone can explain this, especially by citing stack unwinding process

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• deploying a war to tomcat using python

  - by Decado

  Hi, I'm trying to deploy a war to a Apache Tomcat server (Build 6.0.24) using python (2.4.2) as part of a build process. I'm using the following code import urllib2 import base64 war_file_contents = open('war_file.war','rb').read() username='some_user' password='some_pwd' base64string = base64.encodestring('%s:%s' % (username, password))[:-1] authheader = "Basic %s" % base64string opener = urllib2.build_opener(urllib2.HTTPHandler) request = urllib2.Request('http://158.155.40.110:8080/manager/deploy?path=war_file', data=war_file_contents) request.add_header('Content-Type', 'application/octet-stream') request.add_header("Authorization", authheader) request.get_method = lambda: 'PUT' url = opener.open(request) the url.code is 200, and the url.msg is "OK". However the web archive doesn't appear on the manager list applications page. Thanks.

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• Send 404 when requesting index.php through .htaccess?

  - by Daniel

  I've recently refactored an existing CodeIgniter application to use url segments instead of query strings, and I'm using a rewriterule in htaccess to rewrite stuff to index.php: RewriteRule ^(.*)$ /index.php/$1 [L] My problem right now is that a lot of this website's pages are indexed by google with a link to index.php. Since I made the change to use url segments instead, I don't care about these google results anymore and I want to send a 404 (no need to use 301 Move permanently, there have been enough changes, it'll just have to recrawl everything). To get to the point: How do I redirect requests to /index.php?whatever to a 404 page? I was thinking of rewriting to a non-existent file that would cause apache to send a 404. Would this be an acceptable solution? How would the rewriterule for that look like? edit: Currently, existing google results will just cause the following error: An Error Was Encountered The URI you submitted has disallowed characters.

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• Why are most really fast servers written in C instead of C++?

  - by orokusaki

  I'm trying to decide which to learn and I've read all the "Which is better" questions/arguments, so I thought I'd get your take on something more specific. Is there a platform dependency issue that C++ developers run into with such applications? Or, is it because there are more C developers out there than C++? I also noticed that many more third party C modules exist for Python even thought C++ modules are supported. From what I've read on different threads the consensus is that C++ is easier and faster to write, and runs just as fast. Am I missing something really big. Examples: NGINX APE (comet server) Apache

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• How to detect if a form input element of type file is empty

  - by Ankur

  I have some code which reads a file through a form field of type file <input type="file" ... /> I want to give the user another option of providing a url to a file rather than having to upload it as many are already online. How can I detect when this field is empty on the server side. I am using Apache Commons FileUpload FileItemStream item = iter.next(); name = item.getFieldName(); stream = item.openStream(); if(!item.isFormField()){ if(item.toString()!=""){ .... I need to detect when item is empty. The above code doesn't work, nor does using: if(item.equals(null)){ ....

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• How to access java collection, just like the table in the database, having indexes and LINQ-like que

  - by Shaman

  This task occurs from time to time in my projects. I need to handle a collection of some complex elements, having different attributes, such as login, password_hash, role, etc. And, I need to be able to query that collection, just like I query a table in the database, having only partial data. For example: get all users, with role "user". Or check, if there's a user with login "root" and role "superuser". Removing items, based on same data is also needed. The first attempt I've tried is to use Google collections, Apache collections, and lambdaj. All of them have very similar preicate mechanism, but with a great disadvantage: it is based on iteration, one by one, over the collection of items, which is not good, for often used collections, containing big amounts of data. Could you please suggest me some solution? Thanks.

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• Connecting to Sharepoint using HttpClient

  - by Aravindan R

  I am trying to connect to a Sharepoint 2007 using HttpClient 4. The Authentication scheme is NTLM and i wrote an implementation based on this (http://hc.apache.org/httpcomponents-client-ga/ntlm.html). When i try to connect supplying NTCredentials (username,password,host & domain), i get a 500 error saying "The requested function is not supported". I am trying to understand this error. Does anyone know what this error is? and Why is this occuring? Thanks

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• how to find out how much application memory django process is (or will be) taking?

  - by photographer

  There are different "Application memory" options (like 80MB...200MB) in django-friendly hosting called webfaction and I'm confused deciding which one I should buy. Could someone please walk me through the ideas on how to figure out how much memory my project might require (excluding operating system, the main apache server and the database servers memory requirements)? I understand in theory I'll need to perform some kind of load testing, but thought there might be ways to calculate that in advance with some simple/relatively easy understandable approach. I don't know how hard they enforce application memory usage limit, and another question is: what will happen if more users came to the site and more threads started than what I expected? Will the application crash? Or will delays just become uncomfortable? And - no, application is not ready yet (I can't measure anything right now). Development environment if it matters is Winodows 7, 64-bit. Hosting itself is some kind of Linux I think. (Sorry if it's not a stackoverflow question.)

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• Which Subversion do I install for Windows?

  - by johnny

  I was reading this article on Coding Horror: http://www.codinghorror.com/blog/2008/04/setting-up-subversion-on-windows.html I went to the downloads and am confused. I would have just downloaded the first entry but I am afraid it would break my server or something if I don't have apache. We use IIS only and I wouldn't want to break it somehow. I don't even need a web or webdav front end. Which one should I install on this page, please: http://subversion.tigris.org/servlets/ProjectDocumentList?folderID=91 thank you for any help. edit: thanks for information, but I am hoping to stay free with the "regular" subversion. I plan on using TortoiseSVN for the client.

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• Maven/Ivy: Identical artifact with different name in dependency

  - by ThiamTeck

  Currently I am using Ivy for dependency management. And quite often I come across problem of getting identical jar files with different name due to transitive dependency. Example: <dependency> <groupId>javax.mail</groupId> <artifactId>mail</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>org.apache.geronimo.specs</groupId> <artifactId>geronimo-javamail_1.4_spec</artifactId> <version>1.4</version> </dependency> I am thinking of trying out Maven as well. Any best practice to eliminate these identical artifact in either Ivy or Maven?

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• PHP Zip Archive sporadically creating multiple files

  - by user516558

  I have a PHP script (running PHP 5.2 on Apache 2.2) that creates a zip archive of files for a user to download. Everything seems to work just fine; the only issue I have is that periodically multiple files will be created before the ZIP archive is successfully finished. Example: archive-name.zip archive-name.zip.a09600 archive-name.zip.b09600 archive-name.zip.c09600 This does not happen every single time; only periodically - the file is still created but sometimes these extra 'files' are left on the server after it finishes. The code that creates the ZIP archive is as follows: $zip_archive = new ZipArchive(); $zip_archive->open($archiveFullName,ZIPARCHIVE::CREATE); if(!file_exists($archiveFullName)) { foreach ($completed_file_arr as $zip_file) { $isFiller = substr($zip_file,-8) == "_err.txt"; if(!$isFiller) { $zip_archive->addFile($zip_file,$localname); } else $zip_archive->addFromString ($zip_file, "The requested source file could not be found."); } } while(!$zip_archive->close()) sleep(1); //ensure that the ZIP file finishes closing

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• How do I give PHP write access to a directory?

  - by SGWebsNow

  I'm trying to use PHP to create a file, but it isn't working. I am assuming this is because it doesn't have write access (it's always been the problem before). I tried to test if this was the problem by making the folder chmod 0777, but that just ended up making every script in that directory return a 500 error message until I changed it back. How do I give PHP write access to my file system so it can a create a file? Edit: It is hosted on Hostgator shared hosting using Apache.

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• Using a JSON web service from a Java client application

  - by user383341

  I am developing a client-side Java application that has a bit of functionality that requires getting data from some web services that transmit in JSON (some RESTful, some not). No JavaScript, no web browser, just a plain JAR file that will run locally with Swing for the GUI. This is not a new or unique problem; surely there must be some open source libraries out there that will handle the JSON data transmission over HTTP. I've already found some that will parse JSON, but I'm having trouble finding any that will handle the HTTP communication to consume the JSON web service. So far I've found Apache Axis2 apparently which might have at least part of the solution, but I don't see enough documentation for it to know if it will do what I need, or how to use it. Maybe part of the problem is that I don't have experience with web services so I'm not able to know a solution when I see it. I hope some of you can point me in the right direction. Examples would be helpful.

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• How can I use gtkmm with MinGW (g++) without MSYS?

  - by paycity

  Hello stackoverflow members, How can I use gtkmm with MinGW (g++) without MSYS? Here is the story of my problem: I installed MinGW offline with all required packages (full install). I installed Apache Server and I copied all .tar.gz files and I created a website called sourceforge.org [localhost] and I installed automatically MinGW on Windows XP. After, I set the PATH variables. After, I installed gtkmm for MinGW (g++). I tried to compile a simple window with gtkmm + MinGW, but it does not work. I use this command line: g++ simple.cc -o simple pkg-config gtkmm-2.4 --cflags --libs After, I installed MSYS and I can compile simple.cc with MSYS, using this command line: g++ simple.cc -o simple pkg-config gtkmm-2.4 --cflags --libs My problem: I want to compile simple.cc without MSYS. I want compile my simple.cc with cmd.exe - It's possbile? If, yes. How? Thank you for reading my message. Any help is appreciated.

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• Connection: Keep-Alive and PHP sessions not working

  - by user366667

  We have a VB application that needs to run an specific flow on a PHP page. This application was correctly catching the PHPSESSID cookie and using it for all subsequent requests. However, PHP wasn't able to restore any changes made on $_SESSION variable. The variable was changed, saved, and on the next request it was restored as an empty array. We found out that changing the Connection header from "Keep-Alive" to "Close" fixed the issue. I couldn't find anything on the web saying that PHP sessions shouldn't be restored under Keep-Alive connections. Does anyone know why this was happening? PS: We didn't find anything weird or different on Apache, ModSecurity or PHP configuration settings.

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• Sharing a fabfile across multiple projects

  - by Matthew Rankin

  Fabric has become my deployment tool of choice both for deploying Django projects and for initially configuring Ubuntu slices. However, my current workflow with Fabric isn't very DRY, as I find myself: copying the fabfile.py from one Django project to another and modifying the fabfile.py as needed for each project (e.g., changing the webserver_restart task from Apache to Nginx, configuring the host and SSH port, etc.). One advantage of this workflow is that the fabfile.py becomes part of my Git repository, so between the fabfile.py and the pip requirements.txt, I have a recreateable virtualenv and deployment process. I want to keep this advantage, while becoming more DRY. It seems that I could improve my workflow by: being able to pip install the common tasks defined in the fabfile.py and having a fab_config file containing the host configuration information for each project and overriding any tasks as needed Any recommendations on how to increase the DRYness of my Fabric workflow?

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• extending spring form tag library attributes

  - by TimmyJ

  I'm using Spring's form tag library in a Spring MVC application that I am developing. The company I am working for has implemented some company-wide policies based on the definition of custom attributes for certain tags. For instance, by default (though the inclusion of a standard javascript file) all tags have their values automatically converted to upper case. In order to disable this one would define their tag with a custom attribute in the following way: <input type="text" uppercase="false" /> The problem is that the addition of these custom attributes to a spring:form tag causes an error at runtime. I've pasted the error below. org.apache.jasper.JasperException: /WEB-INF/jsp/reportCriteria.jsp(45,5) Attribute uppercase invalid for tag input according to TLD My question is: is there any way to extend the TLD to allow for these attributes, or is there any other way add these custom attributes to these spring:form tags?

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• Configuring log4j at runtime

  - by Neil

  I'm using org.apache.tools.ant.listener.Log4jListener to manage logging with my ant script. The ant script is highly configurable and designed to be run different ways with different parameters and therefore I need to be able to log to files specified at runtime. I have a log4j.properties which specifies a log file to be build.log, and despite my attempts to launch ant redefining properties defined in log4j.properties have been unsuccessful. The build ignores them and continues to write to build.log. I haven't found much support regarding writing to custom files unless it's in Java with their Logger class. Perhaps I'm thinking this through wrong. log4j.properties isn't treated in the same way as a property file in an ant script (hence overrideable from the command line)? Is there a way I can do this intelligently without writing a custom task or something?

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• Changing dalvik/libcore causes rebuilding the whole framework

  - by ZelluX

  I'm adding some interception routines to Dalvik libcore methods (e.g. file open method in libcore/luni/src/main/java/org/apache/harmony/luni/platform/OSFileSystem.java), which I think only changes basic sharing libraries. But to my surprise, every time I run make after modifications, it rebuilds nearly everything of the framework, such as Calculator application, W3C DOM parser, etc. It really takes time to build the framework after a small modification. I'm wondering if it is possible to reduce number of rebuilt components after modifying dalvik libcore? Thanks.

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• Django Import Error with URLS and ROOT_URLCONF confusion

  - by tipu

  The error can be seen here: http://djaffry.selfip.com:8080/ In httpd conf, <VirtualHost *:8080> ServerName tweet_search_engine DocumentRoot /var/www/microblogsearchengine/twingle </VirtualHost> <Directory /var/www/microblogsearchengine/twingle> SetHandler python-program PythonHandler django.core.handlers.modpython SetEnv DJANGO_SETTINGS_MODULE settings PythonOption django.root /var/www/microbloggingsearchengine/twingle PythonDebug On </Directory> Running python manage.py runserver and visiting localhost:8000 returns a splash page telling me everything is okay. However when I visit this site through apache, I get an import error with urls. In my settings.py file I have a line, ROOT_URLCONF = 'twingle.urls' I'm assuming this is the cause of the error. The project folder contains only 4 files: __init__.py manage.py settings.py urls.py I tried replacing twingle.urls with urls.py but then it gave me a different error. What is it I can do to get this working?

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• Listing C/C++ functions (Code analysis in Unix)

  - by Jond

  Whether we're maintaining unfamiliar code or checking out the implementation details of an Apache module it can help if we can quickly traverse the code and build up an overview of what we're looking at. Grep serves most of my daily needs but there are some cases where it just wont do. Here's a common example of how it can help. To find the definition of a PHP function I'm interested in I can type this at the command line: grep -r "function myfunc" . This could be adapted very quickly to C or C++ if we know the return type, but things become more complicated if, say, I want to list every method that my class provides: grep "function " ./src/mine.class.php Since there's no single keyword that denotes a function or method in C++ and because it's generally more complex syntax, I think I'd need some kind of static code analysis tool, smart use of the C Preprocessor or blind faith the coder followed strict code guidelines (# of whitespace, position of curlies etc) to get these sorts of results. What would you recommend? p.s. be nice, this is my first post ;-) :p

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• IE sending through multiple unrequested requests for parent URL

  - by andyjeffries

  We have a rather large/complex web site (so it's not easy to extract portions of it). The problem we're having is that IE6/7/8 (but 6 is the worst) are sending through multiple requests for the parent of a URL (which fails, a different point). As an example, if you visited (dummy domain name obviously): http://www.example.com/view/event/123/456/78 We'd get 8-20 requests for: http://www.example.com/view/event/123/456/ appear in the Apache log. We've tried: Disabling all plugins (including toolbars, Flash, etc) Disabling scripting (e.g. Javascript) And it still sends through at least one erroneous request. We've viewed the requests through ieHttpHeaders so the browser is aware of them (i.e. it's not prefetching by the network's proxy). Any ideas? What can else could cause this?

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• Eclipse is not importing jar dependencies between two projects in the same workspace

  - by jax

  Here is the situation. I have a java project "LicenseGenerator" in eclipse that depends on commons-codec. I have therefore added the commons-codec jar file to the build path. I have Junit tests and everything is working fine. I have made a different project in the same workspace - which happens to be an Android project - that needs to use my LicenseGenerator classes. I added LicenseGenerator to the "projects" tab in the build path - the classes were recognized and I was able to use them. Everything compiled and ran. However, when the part of the LicenseGenerator that used the commons-codec was called from my Android project I got the following error. Could not find method org.apache.commons.codec.binary.Base64.encodeBase64URLSafeString, referenced from method This basically tells me that the commons-codec was not packaged which the Android project, so I added the commons-codec to the android project as well but the same error appears. how do I fix this?

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