Hi, seems that in some config file, a "class name" is missing. So you will have to dig through your ejb.jar.xml and jboss specific deployment descriptors and other stuff. This is the relevant snippet of your exception: anonymous wrote : 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:252) | at org.jboss.deployment.OptAnnotationMetaDataDeployer.processJBossClientMetaData(OptAnnotationMetaDataDeployer.j | ava:115) | at org.jboss.deployment.OptAnnotationMetaDataDeployer.processMetaData(OptAnnotationMetaDataDeployer.java:82) | at org.jboss.deployment.AnnotationMetaDataDeployer.deploy(AnnotationMetaDataDeployer.java:177) | ... 31 more Maybe you find further details in "server.log". Best regards Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4252769#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...