Hi, I have upgrated my EJB 2.1 session beans to EJB 3 Session beans. Therefore I upgrade my server to 4.0.4 GA. Now Im getting the following exception from Bean Manager Transaction beans. CMT beans work fine. | 13:51:18,437 INFO [[/PlantMgt]] java.lang.LinkageError: Class org/jdom/Document violates loader constraints | at java.lang.ClassLoader.defineClass1(Native Method) | at java.lang.ClassLoader.defineClass(ClassLoader.java:620) | at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) | at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1812) | at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866) | at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319) | at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198) | at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) | at java.lang.Class.getDeclaredMethods0(Native Method) | at java.lang.Class.privateGetDeclaredMethods(Class.java:2395) | at java.lang.Class.getDeclaredMethod(Class.java:1907) | at java.io.ObjectStreamClass.getPrivateMethod(ObjectStreamClass.java:1354) | at java.io.ObjectStreamClass.access$1700(ObjectStreamClass.java:52) | at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:421) | at java.security.AccessController.doPrivileged(Native Method) | at java.io.ObjectStreamClass.<init>(ObjectStreamClass.java:400) | at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:297) | at java.io.ObjectStreamClass.initProxy(ObjectStreamClass.java:491) | at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1508) | at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1463) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) | at java.rmi.MarshalledObject.get(MarshalledObject.java:135) | at org.jnp.interfaces.MarshalledValuePair.get(MarshalledValuePair.java:72) | at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:652) | at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587) | at javax.naming.InitialContext.lookup(InitialContext.java:351) | at lk.informatics.outsideplant.ui.util.EJBHomeFactory.lookupHome(EJBHomeFactory.java:47) | at lk.informatics.outsideplant.ui.backendinterface.BEMediator.getRemoteEJBHome(BEMediator.java:26) | at lk.informatics.outsideplant.ui.backendinterface.TelephoneInstallation.getRemoteTelephoneInstallationSession(T | elephoneInstallation.java:185) | at lk.informatics.outsideplant.ui.backendinterface.TelephoneInstallation.findTelephoneInstallation(TelephoneInst | allation.java:119) | at lk.informatics.outsideplant.ui.action.findphoneinstallationuc.FindPhoneInstallationUCSearchCriteriaFAction.ex | ecute(FindPhoneInstallationUCSearchCriteriaFAction.java:70) | Since JDom.jar is not available in lib folder, I copied the laters jar downloaded from JDom site. Thanks in advance, Lahiru View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996610#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...