Hello, I use the remote ejb/CommandServiceBean ejb in order to query an enterprise (EJB) jBPM deployment. The EJB client only depends on the jBPM jar (for the various Command implementations) and on the JBoss client jar. If a Hibernate exceptin occurs, it is wrapped by a JBPMException and rethrown. When deserialiezed on the client side (which does not have a Hibernate dependency), a ClassNotFoundException occurs. Here is the exception handling code in the EJB : catch (Exception e) { | throw new JbpmException("couldn't execute "+command, e); | } I think the CommandServiceBean should not wrap internal implementation-specific exceptions; it should instead simply copy the stack trace and throw a new implementation-independent exception which contains the exception trace without containing the causes themselves. That typically avoids ClassNotFoundExceptions without losing exception history. | java.lang.reflect.UndeclaredThrowableException | at $Proxy1.execute(Unknown Source) | at fr.bnf.jbpm.client.GetInvalidDocumentsTest.testExecute(GetInvalidDocumentsTest.java:27) | 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 junit.framework.TestCase.runTest(TestCase.java:164) | at junit.framework.TestCase.runBare(TestCase.java:130) | at junit.framework.TestResult$1.protect(TestResult.java:106) | at junit.framework.TestResult.runProtected(TestResult.java:124) | at junit.framework.TestResult.run(TestResult.java:109) | at junit.framework.TestCase.run(TestCase.java:120) | at junit.framework.TestSuite.runTest(TestSuite.java:230) | at junit.framework.TestSuite.run(TestSuite.java:225) | at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128) | at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) | at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) | at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) | at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) | at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) | Caused by: java.lang.ClassNotFoundException: org.hibernate.collection.PersistentMap (no security manager: RMI class loader disabled) | at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:371) | at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165) | at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620) | at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247) | at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197) | at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1544) | at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908) | at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) | at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305) | at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348) | at java.util.ArrayList.readObject(ArrayList.java:591) | 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 java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946) | at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809) | at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719) | 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.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:134) | at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:365) | at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:197) | at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:61) | at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:70) | at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:112) | at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:100) | ... 20 more | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059066#... 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