I have deployed a sample ear file containing 2 jars file. The EAR file is 
exploded and even the jar files are in exploded format.

  | EJB3Persistence.ear
  |  |
  |  |--- META-INF
  |  |  |
  |  |  |--- application.xml
  |  |
  |  |
  |  |
  |  |--- myapp_ejb3.jar (this is exploded too)
  |  |  |
  |  |  |--- META-INF
  |  |  |       |
  |  |  |       |--- persistence.xml
  |  |  |       |
  |  |  |
  |  |  |--- <some annotated persistent entities>
  |  |
  |  |
  |  |  
  |  |--- myapp2_ejb3.jar (this too is exploded)
  |  |  |
  |  |  |--- META-INF
  |  |  |
  |  |  |--- <some more annotated persistent entities>
  |  
  |  
  | 
  |      
  |  
  | 
  |     

My persistent (annotated) entities are present in both myapp_ejb3.jar and 
myapp2_ejb3.jar. My persistence.xml file is present in the META-INF folder of 
myapp_ejb3.jar and looks like this :

  | <?xml version="1.0" encoding="UTF-8"?>
  | 
  | <persistence xmlns="http://java.sun.com/xml/ns/persistence";>
  | 
  |     <persistence-unit name="EJB3Persistence"> 
  |             <jta-data-source>java:/EJB3PersistenceDS</jta-data-source> 
  |             <!-- <class>org.myapp.entity.User</class>
  |             <class>org.myapp.entity.Account</class> -->
  |             <!-- The current jar is by default scanned for entities,  so 
just mention the other jar -->
  |             <jar-file>../myapp2_ejb3.jar</jar-file>
  |     </persistence-unit> 
  | </persistence>

When i deploy this EAR on 4.2.2 version of JBoss, i get this deployment error:

  | 15:41:48,844 WARN  [ServiceController] Problem starting service 
persistence.units:ear=EJB3Persistence.ear,jar=myapp_ejb3.jar,unitName=EJB3Persistence
  | java.lang.RuntimeException: error trying to scan <jar-file>: 
file:/D:/JBoss_4_2/server/default/deploy/EJB3Persistence.ear/myapp_ejb3.jar/myapp2_ejb3.jar
  |         at 
org.hibernate.ejb.Ejb3Configuration.scanForClasses(Ejb3Configuration.java:619)
  |         at 
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:338)
  |         at 
org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:126)
  |         at 
org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |         at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:103)
  |         at 
org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
  |         at 
org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
  |         at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at 
org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
  |         at $Proxy0.start(Unknown Source)
  |         at 
org.jboss.system.ServiceController.start(ServiceController.java:417)
  |         at 
org.jboss.system.ServiceController.start(ServiceController.java:435)
  |         at 
org.jboss.system.ServiceController.start(ServiceController.java:435)
  |         at 
org.jboss.system.ServiceController.start(ServiceController.java:435)
  |         at 
org.jboss.system.ServiceController.start(ServiceController.java:435)
  |         at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
  |         at $Proxy4.start(Unknown Source)
  |         at org.jboss.deployment.SARDeployer.start(SARDeployer.java:304)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |         at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
  |         at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
  |         at $Proxy42.start(Unknown Source)
  |         at 
org.jboss.deployment.XSLSubDeployer.start(XSLSubDeployer.java:197)
  |         at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)
  |         at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1015)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)
  |         at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
  |         at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
  |         at $Proxy9.deploy(Unknown Source)
  |         at 
org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:421)
  |         at 
org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:634)
  |         at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263)
  |         at 
org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:336)
  |         at 
org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
  |         at 
org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
  |         at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at 
org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
  |         at $Proxy0.start(Unknown Source)
  |         at 
org.jboss.system.ServiceController.start(ServiceController.java:417)
  |         at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
  |         at $Proxy4.start(Unknown Source)
  |         at org.jboss.deployment.SARDeployer.start(SARDeployer.java:304)
  |         at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)
  |         at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:766)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |         at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |         at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:585)
  |         at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
  |         at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
  |         at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
  |         at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
  |         at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
  |         at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
  |         at 
org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
  |         at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
  |         at $Proxy5.deploy(Unknown Source)
  |         at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482)
  |         at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362)
  |         at org.jboss.Main.boot(Main.java:200)
  |         at org.jboss.Main$1.run(Main.java:508)
  |         at java.lang.Thread.run(Thread.java:595)
  | Caused by: java.lang.RuntimeException: java.util.zip.ZipException: The 
system cannot find the file specified
  |         at 
org.jboss.util.file.JarArchiveBrowser.<init>(JarArchiveBrowser.java:74)
  |         at 
org.jboss.util.file.FileProtocolArchiveBrowserFactory.create(FileProtocolArchiveBrowserFactory.java:48)
  |         at 
org.jboss.util.file.ArchiveBrowser.getBrowser(ArchiveBrowser.java:57)
  |         at 
org.hibernate.ejb.Ejb3Configuration.scanForClasses(Ejb3Configuration.java:610)
  |         ... 119 more
  | Caused by: java.util.zip.ZipException: The system cannot find the file 
specified
  |         at java.util.zip.ZipFile.open(Native Method)
  |         at java.util.zip.ZipFile.<init>(ZipFile.java:203)
  |         at java.util.jar.JarFile.<init>(JarFile.java:132)
  |         at java.util.jar.JarFile.<init>(JarFile.java:97)
  |         at 
org.jboss.util.file.JarArchiveBrowser.<init>(JarArchiveBrowser.java:69)
  |         ... 122 more

As seen in the stacktrace, the relative URL ../myapp2_ejb3.jar is parsed 
incorrectly which leads to this exception. This problem seems to happen only if 
the jar file is in exploded format (as a directory). If i zip the jar files as 
an archive an deploy the same EAR, everything works fine.

Should i open a JIRA with a simple deployable application?

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