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  • What is your development checklist for Java low-latency application?

    - by user49767
    I would like to create comprehensive checklist for Java low latency application. Can you add your checklist here? Here is my list 1. Make your objects immutable 2. Try to reduce synchronized method 3. Locking order should be well documented, and handled carefully 4. Use profiler 5. Use Amdhal's law, and find the sequential execution path 6. Use Java 5 concurrency utilities, and locks 7. Avoid Thread priorities as they are platform dependent 8. JVM warmup can be used As per my definition, low-latency application is tuned for every Milli-seconds.

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  • What are ProductCode & UpgradeCode & GUID? How to detect if certain application/library is already i

    - by claws
    I've already gone through: http://stackoverflow.com/questions/211192/check-if-the-application-is-already-installed http://stackoverflow.com/questions/488717/detecting-if-a-program-is-already-installed-with-nsis http://nsis.sourceforge.net/Add_uninstall_information_to_Add/Remove_Programs My questions are little more in depth and little more general. So, as you understood my problem is that I want to check if "Certain Applications" are already installed on the user's machine? I'm generating the installer using Advanced Installer. First few questions: What is Upgrade Code? Advanced installer has option, Product Version (identify by Upgrade Code) What is Product Code? Advanced installer Product Version (identify by Product Code) Component is installed : GUID. What is GUID? All the above three has values like this: {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} I don't know what these values are but it seems that computer is recognizing software using this kind of strange ID. My required applications are MySQL DBMS MySQL .NET Connector One fact that I discovered is Upgrade Code & Product Code can be extracted from its "msi installer". MySQL Server Installer = mysql-5.1.43-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {0ECED7D8-FF53-4DC9-958E-C2177F528DE4} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{0ECED7D8-FF53-4DC9-958E-C2177F528DE4} Installer = mysql-5.1.46-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {EA8FDE5A-2B33-4EDD-B7E7-8D179DF731A5} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{EA8FDE5A-2B33-4EDD-B7E7-8D179DF731A5} Installer = mysql-essential-5.1.46-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {AD33AF2C-6485-4106-B012-1D9CDC88A454} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{AD33AF2C-6485-4106-B012-1D9CDC88A454} Installer = mysql-essential-5.1.46-win32.msi Upgrade Code = {49EB7A6A-1CEF-4A1E-9E89-B9A4993963E3} Product Code = {9A4DA7EF-A7B9-4282-90AD-10976AA24E69} GUID (for component Installed) = ???? Uninstall Path = HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{9A4DA7EF-A7B9-4282-90AD-10976AA24E69} Observation from above data: UpgradeCode of a software is constant & is irrespective of its version. ProductCode is version specific & it is used by the MSI internally which is actually reasonable because. MSI allows applications of different versions to be installed side by side. I don't know how to find GUID. MySQL ADO .NET Driver Installer = mysql.data.5.2.5.msi Upgrade Code = --- Product Code = {5FD88490-011C-4DF1-B886-F298D955171B} GUID (for component Installed) = ???? Installer = mysql.data.6.2.2.msi Upgrade Code = --- Product Code = {5FD88490-011C-4DF1-B886-F298D955171B} GUID (for component Installed) = ???? UninstallPath =HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{5FD88490-011C-4DF1-B886-F298D955171B} Installer = mysql.data.6.2.3.msi Upgrade Code = --- Product Code = {5FD88490-011C-4DF1-B886-F298D955171B} GUID (for component Installed) = ???? Observations from above data: - surprisingly, it couldn't find UpgradeCode from installer of mysql.data.*.msi. I wonder why? This contradicts with my above observation. - ProductCode for all different versions is same here. This again contradicts my above observations. -I still don't know how to find GUID. Now, What exactly are these ProductCode & UpgradeCode & GUID. Which denotes what? Why are above observations contradicting? I don't care about versions. I don't want to depend on Application Name then how do I check if MySQL driver & MySQL ADO .NET. Does detection become simple if they are .NET assemblies? How to do then? I don't want to ship the assemblies with my deployed files.

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  • image/jpeg returned by groovy/grails is OK on development system, but corrupt on prod system. What c

    - by ?????
    I have a groovy/grails application that needs to serve images It works fine on my dev box, the image is returned properly. Here's the start of the returned JPEG, as seen by od -cx 0000000 377 330 377 340 \0 020 J F I F \0 001 001 001 001 , d8ff e0ff 1000 464a 4649 0100 0101 2c01 but on the production box, there's some garbage in front, and the d8ff e0ff before the 1000 is missing 0000000 ? ** ** ? ** ** ? ** ** ? ** ** \0 020 J F bfef efbd bdbf bfef efbd bdbf 1000 464a 0000020 I F \0 001 001 001 \0 H \0 H \0 \0 ? ** ** ? 4649 0100 0101 4800 4800 0000 bfef efbd It's the exact same code. I just moved the .war over and run it on a different machine. (Isn't Java supposed to be write once, run everywhere?) Any ideas? An "encoding" problem? The code is sent to the response like this: response.contentType = "image/jpeg"; response.outputStream << out;

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  • Default or fink python and lxml under 10.6.8

    - by songdogtech
    Ah, confusion. I'm trying to install a python library called lxml as needed by a python script. I've been through numerous SU quesitons and answers. I haven't been able to make much progress. I run easy_install lxml and get: Processing lxml-3.0.1-py2.6-macosx-10.6-universal.egg lxml 3.0.1 is already the active version in easy-install.pth Using /Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg Processing dependencies for lxml Finished processing dependencies for lxml but when I run my script, I get: File "scraper.py", line 3, in import lxml.html File "/Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/html/init.py", line 42, in from lxml import etree ImportError: dlopen(/Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/etree.so, 2): Symbol not found: _htmlParseChunk Referenced from: /Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/etree.so Expected in: flat namespace in /Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/etree.so I think that maybe I'm not using the correct python install? I've installed python with fink, but should I use OS X's python? This is in my .profile: test -r /sw/bin/init.sh && . /sw/bin/init.sh which points to the fink install. echo $PATH gives me: /sw/bin:/sw/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/X11R6/bin Should I change that to point to snow leopard's python? (Which is 2.6.1) In Library/, there is: which are the lxml libaries I need, it appears, as well as requests. And whereis python gives me /usr/bin/python What do I do? How do I get python to use these libraries. And which python?

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  • Is this error caused by a 64-bit library being accessed by a Java program running in a 32-bit JVM?

    - by Mike
    I'm trying to create a simple Java app that uses JNI to call some native functions. I've followed the examples in the JNI Programming Guide and can't seem to get them to work. I have the following Hello World program, written in Java: class HelloWorld { private native void print(); public static void main(String [] args) { new HelloWorld().print(); } static { System.load("/home/mike/Desktop/libHelloWorld.so"); } } I compile it using javac HelloWorld.java, just like normal. Then I run javah -jni HelloWorld, and finally the following: gcc34 -shared -fpic -o libHelloWorld.so -I/<path to JDK>/include -I/<path to JDK>/include/linux HelloWorld.c gcc34 is the name of the GCC program on my machine here at work (I don't control that) and I obviously place the real path to the JDK in that command. When I run my program, using the standard java HelloWorld, I get an error saying the following: Exception in thread "main" java.lang.UnsatisfiedLinkError: /home/mike/Desktop/libHelloWorld.so: /home/mike/Desktop/libHelloWorld.so: wrong ELF class: ELFCLASS64 (Possible causes: architecture word width mismatch) at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1778) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1674) at java.lang.Runtime.load0(Runtime.java:770) at java.lang.System.load(System.java:1003) at HelloWorld.<clinit>(HelloWorld.java:8) Could not find the main class: HelloWorld. Program will exit. I know I'm running a 32-bit JVM (and unfortunately, as of right now, I'm not allowed to get a 64-bit JVM). I tried telling GCC to compile in 32-bit mode using the "-m32" option, but we don't have (and again, can't get) what we need for that. Does this sound like a 32/64-bit conflict or something else?

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  • Should I use WPF or ASP.NET for my next Web Application development?

    - by gap
    We have a web application that has been built using MySQL / PHP / Javascript+JQuery, with server-side HTML generation. The problem is that of the 10 software developers that work for the company, none are PHP experts (we're all .NET / C# developers). I need to make a recommendation to my management team on which technologies to use as the platform for the next generation of web application products. I want to leverage the .NET / C# expertise which the company has and is otherwise building, and so am inclined to recommend some Microsoft technologies. We don't want a client-side plugin, and we don't need flashy animations/multimedia, so I'm ruling out Silverlight. Is WPF ready for primetime? Is ASP.NET deprecated by WPF? How do I choose between these two technologies? Big Question, I know... I can refine it based on your comments if necessary. Thanks for taking the time.

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  • Java-Maven: How to add manually a library to the maven repository?

    - by Aaron
    I'm trying to generate a jasperReport, but I receive this: net.sf.jasperreports.engine.util.JRFontNotFoundException: Font 'Times New Roman' is not available to the JVM. See the Javadoc for more details. After searching on the net, I found that I need to add a jar to the classpath with the font. So, I create a jar file with the ttf files and now I want to add this as a dependency to my pom file. So: I installed the file : mvn install:install-file -Dfile=tf.jar -DgroupId=tf -DartifactId=tf -Dversion=1.0.0 -Dpackaging=jar and in my pom, I added these lines: <dependency> <groupId>tf</groupId> <artifactId>tf</artifactId> <version>1.0.0</version> </dependency> but I receive this: Dependency 'tf:tf:1.0.0' not found less I checked the repository folder and the jar file is there, in ... tf\tf\1.0.0\ What I'm doing wrong?

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  • What is the easiest way to have a local LAMP installation for web development on mac OS X ?

    - by pixeline
    I'm new to mac os x. In the Windows XP world, there are packages available, like easyPHP, wampserver, uniformserver, that enable you to have a local webserver complete with php, mysql configured via an automatic installer. Really handy. I need the same on my new mac. I know mac os x comes with a local webserver. Is this already with php, mysql preinstalled? I'd like to have you guys advise on the easiest way to have this local lamp so that i can continue developing on this nice and shiny machine. thanks!

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  • Does there exist a jQuery plugin or JavaScript library that allows Venn Diagram presentation?

    - by knowncitizen
    I'm writing a jQuery application to allow analysis of data with the help of visual cues. My data is retrieved via XMLHttpRequest in the form of JSON. The visual cues include histograms, spark lines, and various other graph types. The idea is that the user is able to narrow their data via these various visual views. My question is thus - aside from the Google Charts API, does there exist a JavaScript way of presenting a Venn Diagram? Requirement: no Flash. Canvas is acceptable.

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  • What are the best programming and development related Blogs?

    - by Christopher Cashell
    There are lots of great resources available on the Internet for learning more about programming and improving your skills. Blogs are one of the best, IMO. There's a wealth of knowledge and experience, much of it covering topics not often found in traditional books, and the increased community aspect helps to bring in multiple viewpoints and ideas. We're probably all familiar with Coding Horror and Joel on Software (so no need to mention them), but what are the other great ones out there? What are the Blogs that you find yourself following most closely? Where you see the best new ideas, the most interesting or informative ideas, or just the posts that make you sit back and think? One Blog per answer, and then we'll vote up the best so we can all learn from them.

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  • What are your recommended tools and frameworks for network development on Linux?

    - by Vivek Sharma
    What are your favourite network-tools, which you use to troubleshoot or design (as in conceptualize) your network-application code. Ethereal/Wireshark Nmap any particular simulators (e.g. ns) any special purpose sniffer any particular frameworks, (e.g. iptables) I am looking at must have, and good/advantage to have tools/framework in ones profile/skill set. I think Wireshark and Nmap are must haves.

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  • is there an scp/sftp client library available for flex?

    - by nont
    I need to send files securely from Adobe Air. In any other language, my first thought would be sftp/scp, but I don't see any libraries to do that in Flex. I'm new to flex, so I'm not sure where to look for code examples and repos. It looks like the raw socket interface is available, so I could write one if no good examples exist. Of course, I'm trying to avoid that.

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  • Sometimes Xcode appears to ignore target build settings?

    - by Derek Clarkson
    Hi all, I've created a iPhone static library project with two targets like this Project -- Library (Device) target -- Library (simulator) target The device target has the SDK set to the device so it produces an armv6/7 library and the simulator target is set to the simulator SDK so it produces an i386 library. The issue I'm having is that the SDK settings on the targets keep getting overridden by the XCode active target setting. i.e. if I build the device target, but the XCode window is showing the active SDK as being the simlulator, XCode will build a simulator library instead of a device library, ignoring the settings of the target. Although it will put it into the *-iphoneos/ directory in the build directories! I originally had the same issue with another static library project, and after a lot of playing around got everything to work correctly. i.e. The targets ignore the XCode active SDK because they have their own specifications of what to build. The problem is that I don't know what made it work in that project and I have not been able to reproduce the issue in it either. Does anyone have any ideas as to what is going on? ciao Derek

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  • What development technologies or technology stack is typically used in the security industry?

    - by vfilby
    In this case security means building security (access control, alarm systems, etc). And I am not talking about working directly with the hardware, more focused on web based applications/api's that clients or companies can use? Are there technologies that are commonly used? Are there technologies that shouldn't be used? Are there any real benefits to a linux based stack as opposed to a windows based stack for exposing web based applications?

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  • What do I need for development for an ARM processor?

    - by claws
    Hello, I'm familiar with X86[-64] architecture & assembly. I want to start develop for an ARM processor. But unlike desktop processors, I don't have an actual ARM processor. I think I need an ARM simulator. http://www.armtutorial.com/ say An ARM assembly compiler will be required, the most accessible is the ARMulator. I thought of downloading Armulator but found from http://forums.arm.com/index.php?showtopic=13744 that Its not sold seperately. But you can download an eval of RVDS - which includes RVISS/ARMulator I've downloaded & installed RVDS but It looks very complex. I'm unable to figure out what do I need to do to write ARM assembly & run it. I want to write in assembly not in C/C++. I don't have an ARM processor. What is a good simulator? Can any one please mention in short. How to write assembly & assemble & simulate using RVDS. Please be clear? Are there any other alternative ways. I can't afford buying any kind of boards. I always learn from books rather than tutorials. I'm following these two books: ARM System Developer's Guide: Designing and Optimizing System Software (The Morgan Kaufmann Series in Computer Architecture and Design) ARM System-on-Chip Architecture (2nd Edition) Do you have any better suggestions?

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  • How prevalent is the use of Emacs' eshell in multi-platform development?

    - by pajato0
    I've only recently become aware of Emacs' eshell tool. It looks quite powerful in that it is entirely written in Emacs Lisp and does not require native subshell support. The Emacs info documentation is a bit sparse but EmacsWiki has pretty decent information, at least on a first glance. Given the potential value of eshell as a scripting tool/programmer's aid that works equally well on multiple platforms I'm wondering how prevalent the use of eshell versus the normal (bash) shell is among software developers. Would those of you who have taken the time to learn it recommend it or is it one of those many interesting ideas that did not really pan out?

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  • ManyToManyField "table exist" error on syncdb

    - by Derek Reynolds
    When I include a ModelToModelField to one of my models the following error is thrown. Traceback (most recent call last): File "manage.py", line 11, in <module> execute_manager(settings) File "/Library/Python/2.6/site-packages/django/core/management/__init__.py", line 362, in execute_manager utility.execute() File "/Library/Python/2.6/site-packages/django/core/management/__init__.py", line 303, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 195, in run_from_argv self.execute(*args, **options.__dict__) File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 222, in execute output = self.handle(*args, **options) File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 351, in handle return self.handle_noargs(**options) File "/Library/Python/2.6/site-packages/django/core/management/commands/syncdb.py", line 93, in handle_noargs cursor.execute(statement) File "/Library/Python/2.6/site-packages/django/db/backends/util.py", line 19, in execute return self.cursor.execute(sql, params) File "/Library/Python/2.6/site-packages/django/db/backends/mysql/base.py", line 84, in execute return self.cursor.execute(query, args) File "build/bdist.macosx-10.6-universal/egg/MySQLdb/cursors.py", line 173, in execute File "build/bdist.macosx-10.6-universal/egg/MySQLdb/connections.py", line 36, in defaulterrorhandler _mysql_exceptions.OperationalError: (1050, "Table 'orders_proof_approved_associations' already exists") Field definition: approved_associations = models.ManyToManyField(Association) Everything works fine when I remove the field, and the table is no where in site. Any thoughts as to why this would happen?

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  • XCTest.framework build error

    - by user2703123
    I am using the DropBox Core API in my app and therefore, I must include the XCTest framework, because, when I haven't added the XCTest framework, my app can't connect to dropbox, however when I do add the framework, I get an error while building for the simulator. There is nothing wrong with my code! Here is the error: Ld /Users/Zach/Library/Developer/Xcode/DerivedData/SnapDrop!-fchnxyvnqyeefscfhmohrzxtiqeb/Build/Products/Debug-iphonesimulator/SnapDrop!.app/SnapDrop! normal i386 cd "/Users/Zach/Desktop/SnapDrop!" setenv IPHONEOS_DEPLOYMENT_TARGET 6.1 setenv PATH "/Applications/Xcode5-DP6.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode5-DP6.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Applications/Xcode5-DP6.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode5-DP6.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk -L/Users/Zach/Library/Developer/Xcode/DerivedData/SnapDrop!-fchnxyvnqyeefscfhmohrzxtiqeb/Build/Products/Debug-iphonesimulator -F/Users/Zach/Library/Developer/Xcode/DerivedData/SnapDrop!-fchnxyvnqyeefscfhmohrzxtiqeb/Build/Products/Debug-iphonesimulator -F/Users/Zach/Downloads/dropbox-ios-sdk-1.3.5 -F/Users/Zach/Downloads/dropbox-ios-sync-sdk-1-1.1.0 -F/Applications/Xcode5-DP6.app/Contents/Developer/Library/Frameworks -F/Users/Zach/Desktop -filelist /Users/Zach/Library/Developer/Xcode/DerivedData/SnapDrop!-fchnxyvnqyeefscfhmohrzxtiqeb/Build/Intermediates/SnapDrop!.build/Debug-iphonesimulator/SnapDrop!.build/Objects-normal/i386/SnapDrop!.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.1 -framework iAd -framework AssetsLibrary -framework QuartzCore -framework SystemConfiguration -framework Security -framework CFNetwork -framework XCTest -framework Dropbox -framework DropboxSDK -framework CoreGraphics -framework UIKit -framework Foundation -Xlinker -dependency_info -Xlinker /Users/Zach/Library/Developer/Xcode/DerivedData/SnapDrop!-fchnxyvnqyeefscfhmohrzxtiqeb/Build/Intermediates/SnapDrop!.build/Debug-iphonesimulator/SnapDrop!.build/Objects-normal/i386/SnapDrop!_dependency_info.dat -o /Users/Zach/Library/Developer/Xcode/DerivedData/SnapDrop!-fchnxyvnqyeefscfhmohrzxtiqeb/Build/Products/Debug-iphonesimulator/SnapDrop!.app/SnapDrop! ld: building for iOS Simulator, but linking against dylib built for MacOSX file '/Applications/Xcode5-DP6.app/Contents/Developer/Library/Frameworks/XCTest.framework/XCTest' for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) What should I do? If my framework is corrupt, can you tell me how to reinstall it? I have tried deleting and reinstalling Xcode with no luck.

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