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• Core dump equivalence for Java

  - by m3rLinEz

  So far I have learned about generating thread dump and heap dump using jstack and and jmap respectively. However, jstack thread dump contains only texts describing the stack on each thread. And opening heap dump (.hprof file) with Java VisualVM only shows the objects allocated in the heap. What I actually want is to be able see the stack, to switch to particular stack frame, and watch local variables. This kind of post-mortem debugging can be done normally with tools like WinDbg, gdb and a core file (for a native C++ program.) I wonder if such 'core' file (which will allow me to debug in non-live environment) exists in Java?

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• Best Database Change Control Methodologies

  - by SnapJag

  As a database architect, developer, and consultant, there are many questions that can be answered. One, though I was asked recently and still can't answer good, is... "What is one of, or some of, the best methods or techniques to keep database changes documented, organized, and yet able to roll out effectively either in a single-developer or multi-developer environment." This may involve stored procedures and other object scripts, but especially schemas - from documentation, to the new physical update scripts, to rollout, and then full-circle. There are applications to make this happen, but require schema hooks and overhead. I would rather like to know about techniques used without a lot of extra third-party involvement.

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• Database Network Latency

  - by Karl

  Hi All, I am currently working on an n-tier system and battling some database performance issues. One area we have been investigating is the latency between the database server and the application server. In our test environment the average ping times between the two boxes is in the region of 0.2ms however on the clients site its more in the region of 8.2 ms. Is that somthing we should be worried about? For your average system what do you guys consider a resonable latency and how would you go about testing/measuring the latency? Karl

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• Modifying an old Windows program not to call exit after a keypress without source access

  - by rustyn2

  I have an older C++ Windows program that I've been asked to get run in a kiosk style environment for a student project. From the main menu, hitting ESC will exit the program, which is undesirable. In ye olden days I would have trapped the keyboard interrupt or whatever and dug around to NOOP whatever JMP or CALL was getting referenced in the case statement that likely decides all that, but on Windows everything goes through various registered event handlers, and I haven't done any windows internals work in about 10 years. Is there a good tool to breakpoint a program on certain WM_EVENT (WM_KEYDOWN being a prime target) messages or similar, so that I can narrow down where in the executable the check is made? I'm currently stepping back from various potential system calls made before the various thread cleanups and final exit calls but it seems like there has to be a better way to do this that I'm forgetting.

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• How can I sandbox Python in pure Python?

  - by Blixt

  I'm developing a web game in pure Python, and want some simple scripting available to allow for more dynamic game content. Game content can be added live by privileged users. It would be nice if the scripting language could be Python. However, it can't run with access to the environment the game runs on since a malicious user could wreak havoc which would be bad. Is it possible to run sandboxed Python in pure Python? If not, are there any open source script interpreters written in pure Python that I could use? The requirements are support for variables, basic conditionals and function calls (not definitions).

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• Memory allocation in Xvfb

  - by michael

  Hi, I have following this blog in setting Xvfb in my ubuntu environment: http://corpocrat.com/2008/08/19/how-to-install-xvfb-x11-server-in-linux-server/ So I did this: Xvfb :1 -screen 0 800x600x24& My question is does Xvfb only allocate memory during initialization? i.e. just enough for a display of 800x600x24? So as I have more and more programs (different programs or same program multiple times) display to the Xvfb , it does not allocate more memory? Thank you.

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• Performance Testing Versus Unit Testing

  - by Mystagogue

  I'm reading Osherove's "The Art of Unit Testing," and though I've not yet seen him say anything about performance testing, two thoughts still cross my mind: Performance tests generally can't be unit tests, because performance tests generally need to run for long periods of time. Performance tests generally can't be unit tests, because performance issues too often manifest at an integration or system level (or at least the logic of a single unit test needed to re-create the performance of the integration environment would be too involved to be a unit test). Particularly for the first reason stated above, I doubt it makes sense for performance tests to be handled by a unit testing framework (such as NUnit). My question is: do my findings / leanings correspond with the thoughts of the community?

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• making a new opensource WebOs ?

  - by Ayman

  hello guys, trying to make a new webos for my graduation project, I'm a computer science guy, and this project will be my graduation project. two days ago i sat with ghost OS R&D operation manager and he told me it's a big project and i should not thinking in a project like this. anyway i have an experience, and i can made it using GWT and some programing languages for server side. and am gonna make it as a development environment, OS with specific API that allows any body to write an applications, or some modifications to add a 3rd party apps. i need some feedback and what about making it open-source project, what do you think guys ?

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• Cannot Access Rails Server From Outside LAN

  - by Mike

  Hello All This is my first post here. I have a rails server I'm running on a dedicated server that I have jail shell access to. I can start up a rails server and access it just fine using the text-based browser elinks running in that jail shell using both internal and public IP's. However, I cannot access the rails server from outside that chrooted environment. Does anyone have any ideas as to what might be going on? Any help would be appreciated. Thanks.

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• SQL Server CLR Integration to acheive Encryption/Decryption

  - by Aakash

  I have a requirement to store the data in encrypted form in database tables. I want to do it at database level but the problems I am facing: ( a) Data Type of the field should be Varbinary. ( b) Encryption is not supported by Workgroup edition ( c) Is it possible to encrypt Numeric Fields? I want to access the encrypted data in tables to fetch in views and stored procedure for some processing but due to above problems I am not able to. Here is my Environment: Development Platform - ASP.Net,.Net Framework 3.5,Visual studio 2008 Server Operating System - Windows Server 2008 Database - SQL Server 2008 Work group edition I was also thinking to adopt a different approach to resolve this issue (yet to test it's feasibility). I was just wondering if I could create a CLR function (which could take parameters to encrypt and decrypt data using Cryptography types provided in .Net framework) and use the CLR integration feature of SQL Server and call that function from stored procedure and views. I am not sure if I am thinking in right direction? Any advice on this as well please.

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• WCF - Compact Framework - Pull data from mobile client

  - by jagse

  Hello guys, I want to communicate xml serialized objects from the server to the client and the other way arround. Now it is (probably) easy to invoke methods from a mobile client (compact framework) using WCF, but is there a way so that the server can invoke methods on the client side or some other way to pull data from the client? I know that callback contracts are not available in the compact framework as you can see here: http://blogs.msdn.com/andrewarnottms/archive/2007/09/13/calling-wcf-services-from-netcf-3-5-using-compact-wcf-and-netcfsvcutil-exe.aspx Originally I thought of socket programming and of developing this by myself, then someone here mentioned WCF. But it seems like WCF only would work in a non mobile environment as I need callbacks. Anyone can help me with this? Is it possible to develop a two way communication with a desktop server and multiple mobile clients using WCF, or will I have to do socket programming? Thanks for any advice or any kind of help!

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• Paperclip - Stream not recognized by identify command

  - by user117046

  I'm getting a paperclip error every time that I upload an image: [paperclip] An error was received while processing: #<Paperclip::NotIdentifiedByImageMagickError: /tmp/stream20100531-1921-uvlewk-0 is not recognized by the 'identify' command.> I'm running: Ubuntu 10.04, Imagemagick 6.5.1-0 (via apt-get), Paperclip 3.2.1.1 My path to identify is 'usr/bin/identify' and have confirmed Imagemagick works via command line I've tried putting adding the path to the options, but to no avail. I've tried: Paperclip.options[:command_path] = "usr/bin" or Paperclip.options.merge!(:command_path => "/usr/bin") in environment.rb or config/initializers/paperclip.rb. Though it makes no rational sense, I also tried "usr/local/bin" since this is the default for most people. Any thoughts on getting around this? Thanks!

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• Properly handling unicode characters in Rails

  - by Gdeglin

  By default Rails allows users of our application to input non-utf8 data, such as: ¶®«¼ However when we attempt to retrieve the data from our database and render it in a template Rails incorrectly assumes that it is in UTF-8 format and throws an error. ArgumentError: invalid byte sequence in UTF-8 What is the best way to handle this? I have seen one fix that suggested sanitizing the data in every place the user can input it. However, that would involve changing a considerable amount of code and it would strip out the characters entirely. Ideally we would want some characters converted to their UTF-8 equivalents. Our environment: Ruby: 1.9.1 Rails 2.3.5 MySql Gem: 2.8.1 This is a serious and urgent problem for us so your answers are very appreciated!

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• Random blank pages on Safari when developing webapp

  - by Ali

  Hey guys, I've been experiencing a safari problem while building a web application. The screen goes completely blank (white) and refreshing won't help. Going to another page on the site gives the same problem. Then magically, after a little while, everything goes back to normal and pages are rendered correctly! This started happening around the same time that I SUSPECT my hosting automatically upgraded from PHP 5.2.x to 5.3 (all of a sudden, we got 'deprecated function' errors and the error settings and handling were unchanged) I also have to mention that this doesn't happen in our dev environment (PHP 5.2.9, Apache 2) Settings Safari 4.0.2 and the latest one (don't know the version) Server side: PHP 5.3, MySQL 5.0.90, Apache is cPanel Easy Apache v3.2.0 Does anyone know why this is happening at all, or how to fix it? I appreciate any help or pointers you might have. Thanks!

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• Invalidate (MFC) debug assertion failed error message

  - by kobac

  I've made a custom control, and when I want it to repaint on the screen I call Invalidate(), and afterwards UpdateWindow(), but i get message: debug assertion failed for a file afxwin2.inl in line 150 which is: AFXWIN_INLINE void CWnd::Invalidate(BOOL bErase) { ASSERT(::IsWindow(m_hWnd)); ::InvalidateRect(m_hWnd, NULL, bErase); } The thing is that when I run the same app in release mode, it doesn't report any message! So this clue makes me think it's about some environment configuration I should change. What do you think? Thanks.

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• Can Core Data be used on Linux?

  - by glenc

  This might be a stupid question, but I was wondering whether or not you can use the Core Data libraries on Linux at all? I'm planning how to build the server side of an iPhone app that I'm working on, and have found that you can use PyObjC to get access to Core Data in a Python environment, e.g. use Core Data in a TurboGears web application. At this point I'm thinking that you would have to run the web server on Mac OSX, because I can't find any evidence on the internet that you can access the Objective-C libraries on Linux. I've always written webapps on Linux but will obviously make the jump to an OSX server if it allows me to use the same datastore implementation on the iPhone and the server, the only job remaining being the Core Data <- Web Services XML translation that has to happen on the wire.

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• Behavior of a pipe after a fork()

  - by Steve Melvin

  When reading about pipes in Advanced Programming in the UNIX Environment, I noticed that after a fork that the parent can close() the read end of a pipe and it doesn't close the read end for the child. When a process forks, does its file descriptors get retained? What I mean by this is that before the fork the pipe read file descriptor had a retain count of 1, and after the fork 2. When the parent closed its read side the fd went to 1 and is kept open for the child. Is this essentially what is happening? Does this behavior also occur for regular file descriptors?

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• How to set up jndi.properties for DataStore?

  - by FarmBoy

  I'm struggling to set connect a Java program to MySQL using JPA/Hibernate. I'm currently getting the following error when I try to call createEntityManagerFactory(): [main] ERROR org.hibernate.connection.DatasourceConnectionProvider - Could not find datasource: java:jdbc/myDataDS javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645) at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288) at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325) at javax.naming.InitialContext.lookup(InitialContext.java:392) at org.hibernate.connection.DatasourceConnectionProvider.configure(DatasourceConnectionProvider.java:75) Googling seems to indicate that I need a jndi.properties file in META-INF in my classpath, but I can't seem to find any information about what that file should contain in my case.

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• TypeInitializationException When Getting an NHibernate Session

  - by Paul Johnson

  I’ve run into what appears to be an NHibernate config problem. Basically, I ran up a simple proof of concept persistence integration test using NUnit, the test simply querys an Oracle database and successfully returns the last record received by the underlying table. However, when the assemblies are taken out of the NUnit test environment and deployed as they would be for an actual application build, my call for an NHibernate session results in a ‘TypeInitializationException’ whilst executing the code line: sessionFactory = New Configuration().Configure().BuildSessionFactory() The application is a vb.net console app running against an Oracle 9.2 database, using a ‘coding framework’ published on the web by Bill McCafferty entitled 'NHibernate Best Practices with ASP.NET' (pre S#harp Architecture). I am running version 2.1.2.4000 of NHibernate. Any assistance much appreciated. Kind Regards Paul J.

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• Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more i

  - by pooyakhamooshi

  I have developed an application using Entity Framework, SQL Server 2000, VS 2008 and Enterprise Library. It works absolutely fine locally but when I deploy the project to our test environment, I am getting the following error: "Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information." Stack trace: at System.Reflection.Module._GetTypesInternal(StackCrawlMark& stackMark) at System.Reflection.Assembly.GetTypes() at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.LoadTypesFromAssembly(LoadingContext context) at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.InternalLoadAssemblyFromCache(LoadingContext context) at System.Data.Metadata.Edm.ObjectItemCollection.AssemblyCacheEntry.LoadAssemblyFromCache(Assembly assembly, Boolean loadReferencedAssemblies, Dictionary2 knownAssemblies, Dictionary2& typesInLoading, List`1& errors) at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies) at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyForType(Type type) at System.Data.Metadata.Edm.MetadataWorkspace.LoadAssemblyForType(Type type, Assembly callingAssembly) at System.Data.Objects.ObjectContext.CreateQueryT Entity Framework seems to have issue, any clue how to fix it?

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• Query Cache Issues - releasing cache locks?

  - by Corey Coogan

  I have enabled query caching to use the NHibernate.Caches.Prevalence.PrevalenceCacheProvider provider. This is running on IIS 7, WCF service. I have limited rights to what I can do, but I'm getting an exception about releasing cache locks. I've created the following 2 directories in the system32/inetsrv directory and given full control to the account IIS is using. NHibernate.Cache.StandardQueryCache Some other cache dir I can think of right now This doesn't happen in my local environment so I'm thinking this is somehow related to caching. Do I need to give the IIS account full control to the inetsrv dir as well?

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• log in as a proxy for a certain user

  - by Samuel

  We have a requirement, wherein the administrative user needs to proxy in as a certain user in an environment where several users (Role: User) are managed by an administrator (Role: Admin). e.g If we have the following users in the database (admin, user1, user2, user3), we would want the admin to proxy as 'user2' and use the system in certain scenarios. Authentication in our web application is based username / password credentials, what mechanisms are available for the admin to proxy as 'user2' when he doesn't have the password for 'user2'. How can the application track such access for audit purposes to mention that 'admin' had proxied for 'user2' and performed certain actions. I am looking for suggestions on supporting this in our j2ee (jboss seam) web application.

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• How to solve using Flex Builder 3 and BlazeDS?

  - by Teerasej

  I am using Flex builder 3, BlazeDS, and Java with Spring and Hibernate framework. I using the remote object to load a string from spring's configuration files. But in testing, I found this fault event like this: RPC Fault faultString="java.lang.NullPointerException" faultCode="Server.Processing" faultDetail="null" I have checked the configuration in remote-config.xml and services-config.xml. But it looks good. Some people have talked about this problem around the Internet and I think you can help me and them. I am using these environment: Flex Builder 3 BlazeDS 3.2.0 JBoss server Full stacktrace: [RPC Fault faultString="java.lang.NullPointerException" faultCode="Server.Processing" faultDetail="null"] at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AbstractInvoker.as:220] at mx.rpc::Responder/fault()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\Responder.as:53] at mx.rpc::AsyncRequest/fault()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\rpc\AsyncRequest.as:103] at NetConnectionMessageResponder/statusHandler()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\channels\NetConnectionChannel.as:569] at mx.messaging::MessageResponder/status()[C:\autobuild\3.2.0\frameworks\projects\rpc\src\mx\messaging\MessageResponder.as:222]

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• popen fails with "sh: <command>: not found"

  - by smallmeans

  I'm developing a server application and I recently encountered this wierd error on a testing server (Debian Squeeze). Every executable I pass to popen fails with a msg: sh: sort: not found // happens to any command This happens regardless whether I point to the full path returned by "type" or keep it short . As mentioned earlier, this happens at only one testing environment, to add confusion, am running the same OS and had no problem whatsoever. Popen is apparently using sh to execute commands, but if I run the same command thru the prompt (bash or sh), everything's fine Thanks in advance (PS: even tried Python os.popen just to nail this head scratcher, and it works!) Edit this is a simple call that fails: $command="tail -10 myfile"; $handle = popen($command.' 2>&1','r'); if($handle){ while (!feof($handle)){ ....//process buffer } } returns: sh: tail: not found

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• How to reserve a set of primary key identifiers for preloading bootstrap data

  - by Joshua

  We would like to reserve a set of primary key identifiers for all tables (e.g. 1-1000) so that we can bootstrap the system with pre-loaded system data. All our JPA entity classes have the following definition for the primary key. @Id @GeneratedValue(strategy = IDENTITY) @Column(name = "id", unique = true, nullable = false, insertable = false, updatable = false) private Integer id; is there a way to tell the database that increments should start happening from 1000 (i.e. customer specific data will start from 1000 onwards). We support (h2, mysql, postgres) in our environment and I would prefer a solution which can be driven via JPA and reverse engineering DDL tools from Hibernate. Let me know if this is the correct approach

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