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• Annotations (@EJB, @Resource, ...) within a RESTful Service

  - by Dominik

  Hi! I'm trying to inject a EJB within my RESTful Service (RESTEasy) via Annotations. public class MyServelet implements MyServeletInterface { ... @EJB MyBean mybean; ... } Unfortunately there is no compilation or AS error, the variable "mybean" is just null and I get a NullPointerException when I try to use it. What I'm doing wrong? Here are some side-informations about my architecture: JBoss 4.2.2.GA Java version: 1.5.0_17 local MDB-Project remote EJB-Project WAR Project with the RESTful Service which uses the remote EJB and sends messages to the local MDB-Project Thanks in advance! br Dominik p.s: everything is working fine when I use normal context lookup.

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• Thoughts on moving to Maven in an enterprise environment

  - by Josh Kerr

  I'm interested in hearing from those who either A) use Maven in an enterprise environment or B) tried to use Maven in an enterprise environment. I work for a large company that is contemplating bringing in Maven into our environment. Currently we use OpenMake to build/merge and home-grown software to deploy code to 100+ servers running various platforms (eg. WAS and JBoss). OpenMake works fine for us however Maven does have some ideal features, most importantly being dependency management, but is it viable in a large environment? Also what headaches have/did you incur, if any, in maintaining a Maven environment. Side note, I've read http://stackoverflow.com/questions/861382/why-does-maven-have-such-a-bad-rep, http://stackoverflow.com/questions/303853/what-are-your-impressions-of-maven, and a few other posts. It's interesting seeing the split between developers.

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• Hibernate - hibernate.hbm2ddl.auto = validate

  - by azp74

  I am interested in how hibernate.hbm2ddl.auto=validate actually works and I am struggling to find comprehensive documentation. We've recently discovered production system was affected by http://opensource.atlassian.com/projects/hibernate/browse/HHH-3532 (Hibernate matches foreign keys on name, rather than signature and so will recreate them for you) and hibernate.hbm2ddl.auto=update is being removed from our next release. I would be quite happy to just get rid of hibernate.hbm2ddl.auto altogether and manage our database ourselves. However, not all my colleagues share this world view and some are keen to add back in hibernate.hbm2ddl.auto=validate. I'm concerned this will hit the same problem and I'm interested in finding more documentation about how this validation actually works. The Hibernate Community Documentation (http://docs.jboss.org/hibernate/core/3.3/reference/en/html/session-configuration.html) really just makes reference to the values. Does anyone have any good documentation pointers, or any real life experience of using validate in a production system?

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• JMS Session pooling for large numbers of Topic subscribers

  - by matthewKizoom

  I'm writing an app that will create lots of JMS topic subscribers. What is best practise regarding reusing sessions? A session per subscriber? A pool of sessions? With a session per subscriber the thread count seems unreasonable. Is this a job for something like a ServerSessionPool? What I've seen so far seems to suggest that ServerSessionPool is more geared towards one receiver consuming messages concurrently rather than lots of receivers. I'm currently working with HornetQ 2.0.0GA embedded in JBoss 4.3.0CP6.

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• How to find the physical path of a GSP file in a deployed grails application

  - by Deepak Mittal

  I need to find out the physical path of a grails GSP file. My requirement is that I want to create a new layout file at run-time and use that in the application. I have been able to achieve this without problem when the application runs on jetty (grails run-app), however, when I deploy the app on Jboss, the path at which the file needs to be created changes. So, ideally I would like to find out at runtime using some magical utility the path of a particular GSP (lets say main.gsp layout file) and I need to create my new layout in the same directory in which main.gsp reside. Any pointers? -Deepak

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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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• good documentation about "avoid catching throwable", in context of weblogic server

  - by Marcel

  hi all, i am currently refactoring an existing codebase (EJBs...) to rip out all blocks where a Throwable is catched inside of the EJB. try { ... do some business logic } catch(Throwable t){ ... log and swallow ... :-( } i want/need to convince the people around me with proper documentation that "catching throwable" is a no-go for an EJB (we have lots of discussions around this :-(( ). weblogic will handle all the "Error" conditions and maybe invalidate EJBs and put fresh(working) EJBs into the pool. catching Throwable would undermine all these security nets provided by weblogic. and catching throwable is bad practice anyway (but people here are reluctant and use the "throwable" hammer everywhere). is anyone able to point me to some online docs where this behaviour is explained (for weblogic or jboss or...). i searched via google and had a look at the weblogic docs but wasn't able to find anything, just generic java doc. any help highly appreciated cheers marcel

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• Using glassfish gem with SSL

  - by Wolfgang

  My goal is to deploy a simple rails application on a windows server using the glassfish gem. I have no trouble getting the glassfish gem to work with regular http, however I now need to add SSL security and I cannot find any links on how to enable https in the glassfish gem. Has anyone succeeded in setting up the glassfish gem to support SSL? Are there any other ways to serve a rails application over SSL on windows without any additional software installation (e.g. IIS, Glassfish, jBoss)?

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• Are there any widespread, modern Java coding conventions?

  - by brianegge

  Sun's "Code Conventions for the Java Programming Language" was last updated April 1999. Ten years later a lot has changed in the language, as well as general usage patterns. Are there more up to date, widely adopted standards? Most guidelines omit specifying file encoding and line endings. Sun recommends mixed tabs and spaces. The Eclipse IDE defaults to Eclipse's standard, which is tabs only. The Maven style guide is spaces only. Many style guides, such as JBoss, follow Sun's guidelines, but prefer K&R braces instead of OTBS. Each Apache project has it's own style guide, with slight differences between each one.

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• spring mvc vs seam

  - by darko petreski

  Hi, Spring mvc is a framework that has been long time out there, it is well documented and proven technology. A lot of web sites are using spring. Seam is a framework based on jsf - rich faces implementation. It has a lot of ajax based components. It uses some heavy stuff like EJB, JPA. All of this is prone to errors and this framework is so slow (at my computer it is almost impossible do develop something because it is really slow, especially redeploying on jboss) But is is very good for back office applications. Does someone have a professional experience with this two frameworks? Can you recommend the better one ? Why? Regards

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• How to Deploy Simple Java Projects into EAR?

  - by Franco

  Hi, I am using MyEclipse and I use an Enterprise Application Project (EAP) that automattically deploys my Web and EJB Projects. These projects use some other projects that are just POJOs, "simple" java projects. Like a library kind of thing. The problem is that when I change something in on of the "simple" java projects I have to redeploy my entire EAP in my JBoss in order to see the changes. What I want is a way to automatically deploy those projects (POJOs) in the EAP, so hot code replacement works with those too. Any ideas?

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• Identify cause of hundreds of AJP threads in Tomcat

  - by Rich

  We have two Tomcat 6.0.20 servers fronted by Apache, with communication between the two using AJP. Tomcat in turn consumes web services on a JBoss cluster. This morning, one of the Tomcat machines was using 100% of CPU on 6 of the 8 cores on our machine. We took a heap dump using JConsole, and then tried to connect JVisualVM to get a profile to see what was taking all the CPU, but this caused Tomcat to crash. At least we had the heap dump! I have loaded the heap dump into Eclipse MAT, where I have found that we have 565 instances of java.lang.Thread. Some of these, obviously, are entirely legitimate, but the vast majority are named "ajp-6009-XXX" where XXX is a number. I know my way around Eclipse MAT pretty well, but haven't been able to find an explanation for it. If anyone has some pointers as to why Tomcat may be doing this, or some hints on finding out why using Eclipse MAT, that'd be appreciated!

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• ESRI frameworks: java vs javascript

  - by Luke

  I'm about to develop a web mapping application with ESRI Products like ArcGIS Server and Image Server. I can't find a good comparison between the Java Web ADF and the Javascript Framework. They're of course different because one is a full environment and the other is only client side but it's much more concise and the step to start is minimal. Another problem is that the Java Web ADF is not compatible with our current application server (JBoss 4.2.2) and require an old 4.0.2 version. Someone out there has experience that can help me? Many thanks.

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• How to add system property equivalent to java -D in Ant

  - by Shervin

  Hi. I need to set java -Djava.library.path=/some/path and I want to do it when I am running my ant script, building my jar. I think I have to use <sysproperty key="java.library.path" value="/some/path"/> but it doesnt work. I cannot make the syntax work. The only thing I have Googled and found is sysproperty in conjunction with <java classname> but that doesnt make any sense to me. I am not sure if this is relevant, but I am using ant to create a ear and deploying this ear in JBoss.

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• telling java to accept self-signed ssl certificate

  - by Nikita Rybak

  It looks like a standard question, but I couldn't find clear directions anywhere. I have java code trying to connect server with probably self-signed (or expired) certificate. It gives something like this [HttpMethodDirector] I/O exception (javax.net.ssl.SSLHandshakeException) caught when processing request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target As I understand, I have to play around with keytool and tell java that it's ok to allow this connection. But all comments I've found assume I'm fully proficient with keytool, like "generate private key for server and import it into keystore". And I'm not. Is there anybody who could post detailed instructions? I'm running unix, so bash script would be best. Not sure if it's important, but code executed in jboss. Thanks a lot!

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• How to terminate a JBPM processInstance

  - by jie-wang

  Hi all I'm using JBPM 4.3 and trying hard to find a way to terminate one processInstance. First I simply used something like: executionService.endProcessInstance(processInstanceID, "active"); However I got exception thrown out. "exception while executing command org.jbpm.pvm.internal.cmd.EndProcessInstance java.lang.NullPointerException" Then I googled to find this post http://community.jboss.org/thread/146478, which didn't seem to give a resolution. I tried nevertheless to end all executions of the processInstance by calling ((ExecutionImpl) execution).end(); But the same exception was thrown again when I finally try to call executionService.endProcessInstance(processInstanceID, "active"); Did anyone have the same experience and solution?

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• How to rewrite the URL

  - by Kalpana

  I have a small application built using Seam 2.2, Richfaces 3.3, JBoss 5.1. Most of the page navigation adds the request parameters to the target URL. I would like to hide parameters to be hidden to the customer who is using the application (e.g. I would expect the URL to be something like "http://localhost:8080/books/Book.seam". The parameters (userId, orderId and cmId) are currently mapped to the backend bean via Book.page.xml. How do I prevent the request parameters from showing up in the browser URL, as it also allows the customer to manipulate the URL. We did look at seam URL re-writing feature, it talked about manipulating say the primary key id in a REST format, not sure how to accomplish something more complex like the above use case in a elegant fashion.

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• JSF, actionlistener at facelets

  - by asrijaal

  Hi there, I'm using JSF (Mojarra 1.2) with Richfaces (3.3.2) within some facelets which are used as portlets (I'm using the Jboss Portlet Bridge 2.0 here). Now I'm facing something strange: I've got an actionlistener on my <h:commandButton> which is triggered, when the button is clicked but when I simply reload the page, the action is executed everytime I load the page again. This happens only if I already triggered the action before. Is this behaviour normal? I should notice that Spring 2.5 is used to manage my beans, the mentioned beans are session-scope beans, maybe this is a interessting point?!

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• Updating to Spring 2.5.5 causes a javax.servlet.UnavailableException: org.springframework.web.struts

  - by Averroes

  I have been told to update some application from Spring 2.0.8 to Spring 2.5.5. This application is using Struts 1.2.7. Once I change the Spring.jar I get the following exception while loading in JBoss 4.0.5: 10:14:57,579 ERROR [[/PortalRRHH]] Servlet /PortalRRHH threw load() exception javax.servlet.UnavailableException: org.springframework.web.struts.DelegatingTilesRequestProcessor This is defined in the struts-config.xml this way: <controller locale="true"> <set-property property="processorClass" value="org.springframework.web.struts.DelegatingTilesRequestProcessor"/> </controller> I have no clue of what is happening since it works with the old version of Spring and the DelegatingTilesRequestProcessor is still available in Spring 2.5.5. I have no previous experience with Struts so if you need anything else to figure what the problem is please ask and I will update the question. Thanks.

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• Does flex not support hashmaps?

  - by Dr.Dredel

  I have a Flex object which collects a DTO from the server. All the fields arrive filled in correctly except for the one that is a HashMap. It arrives as null. I've tried giving it a type of both ArrayCollection and Dictionary, but that hasn't fixed it. Does anyone know if there's an inherent incomaptability between Java HashMap and Flex? If not, what might I be doing wrong here? I'm looking at my jboss console and I see the data being populated correctly in the server side before delivery to the client. However, as it gets to the client, that field is null. I'm ready to kill myself.

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• I would like to build a Java Web Application. What's the quickest start?

  - by Vish

  I am a reasonably competent programmer, with about 11 years experience. I particularly like Ruby/Rails and ActionScript. And Java is not too hard. I'd like to develop a web application in Java in order to leverage things like BlazeDS and learn some new tricks with regard to JBoss and the whole Java App thing. But I'm having trouble - and confused - looking for a smooth start. I don't want to use Grails, thanks, I want to use Pure Java, with whatever Framework you can think of. Spring, Hibernate, lalala, it's cool. Where do I start?

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• Apache Commons EmailValidator and SeamListener Exception (not deploying)

  - by ranirani

  Hi, friends When using Apache Commons EmailValidator through Maven, I have the following problem that doesn't deploy my app: Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener java.lang.LinkageError: loader constraints violated when linking org/xml/sax/EntityResolver class I've used the following code at my pom.xml: <dependency> <groupId>commons-validator</groupId> <artifactId>commons-validator</artifactId> <version>1.3.1</version> </dependency> One help?

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• Automatic VM deployment

  - by Robert Wilson

  I have an idea to streamline deployments of prototypes within our team using VMs. The idea would be that a developer would be able to deploy their artifacts to Maven, then use a Web interface to pull them onto a development VM for integration/regression testing. They would then be able to to push those artifacts to a reference system, and finally onto production. I'm currently thinking of doing this myself using the vSphere Java API ( http://vijava.sourceforge.net/ ), and some simple scripting to grab artifacts from the Maven repository, configuration from SVN, and then start up a JBoss server. It feels like the kind of thing that may already be available though, has anyone heard of something similar?

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• JVM tuning on Amazon EC2

  - by Shadowman

  We will be deploying a production application to Amazon EC2 very shortly. Initially, we'll just be using a "small" instance, but have plans to scale up not long afterwards. My question is, has any investigation been done on JVM tuning for the EC2 environment? Are there any specific changes that we should make to our JVM parameters to compensate for quirks/characteristics of Amazon EC2? Or, do the normal tuning methodologies apply here as they would in a physical environment? Our application will be deployed on Tomcat 6.x. It is built using JBoss Seam 2.2.x, and uses PostgreSQL 8.x as the backend database. Any advice you can give is greatly appreciated!

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