User development, A new message was posted in the thread "EJB 2 Deployment issue on JBoss 5": http://community.jboss.org/message/529307#529307 Author : Manigandan R Profile : http://community.jboss.org/people/manigandan5986 Message: -------------------------------------------------------------- Dileep,   I am facing a similar issue.   A resource adapter that used to work with JBoss 4 is now not working with JBoss 5.1.1. And I get the error :   16:09:18,221 ERROR [AbstractKernelController] Error installing to PostClassLoader: name=vfszip:RA-Name-masked-ra.rar/ state=ClassLoader mode=Manual requiredState=PostClassLoader org.jboss.deployers.spi.DeploymentException: Cannot process metadata         at org.jboss.deployers.spi.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:49)         at org.jboss.deployment.AnnotationMetaDataDeployer.deploy(AnnotationMetaDataDeployer.java:181)           ....         at org.jboss.Main$1.run(Main.java:556)         at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.ClassNotFoundException: Empty class name ''         at org.jboss.classloader.plugins.ClassLoaderUtils.checkClassName(ClassLoaderUtils.java:52)         at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:416)         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)         at org.jboss.deployment.OptAnnotationMetaDataDeployer.processJBossClientMetaData(OptAnnotationMetaDataDeployer.java:115)         at org.jboss.deployment.OptAnnotationMetaDataDeployer.processMetaData(OptAnnotationMetaDataDeployer.java:82)         at org.jboss.deployment.AnnotationMetaDataDeployer.deploy(AnnotationMetaDataDeployer.java:177)         ... 32 more   Were u able to work around the issue? -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/529307#529307