Invocation on a simple singleton bean:

public class SomeSingletonBean
{

public void doSomething(SomeCustomClass param)

}

fails with ClassNotFoundException for SomeCustomClass like below:

java.lang.RuntimeException: java.lang.ClassNotFoundException: de.xxx.persistence.entity.core.Company (no security manager: RMI class loader disabled)
at org.jboss.aop.joinpoint.MethodInvocation.getArguments(MethodInvocation.java:318)
at org.jboss.ejb3.singleton.aop.impl.AOPBasedSingletonContainer.dynamicInvoke(AOPBasedSingletonContainer.java:331)
at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:897)
at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:768)
at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:721)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:548)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:234)
Caused by: java.lang.ClassNotFoundException: de.xxx.persistence.entity.core.Company (no security manager: RMI class loader disabled)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:375)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)
at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620)
at org.jboss.system.JBossRMIClassLoader.loadClass(JBossRMIClassLoader.java:91)
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:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1667)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
at java.rmi.MarshalledObject.get(MarshalledObject.java:142)
at org.jboss.aop.joinpoint.MethodInvocation.getArguments(MethodInvocation.java:309)
at org.jboss.ejb3.singleton.aop.impl.AOPBasedSingletonContainer.dynamicInvoke(AOPBasedSingletonContainer.java:331)
at org.jboss.ejb3.session.InvokableContextClassProxyHack._dynamicInvoke(InvokableContextClassProxyHack.java:53)
at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:91)
at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:897)
at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:768)
at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:721)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:548)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:234)
at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:213)
at org.jboss.remoting.Client.invoke(Client.java:1927)
at org.jboss.remoting.Client.invoke(Client.java:770)
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
at $Proxy6.invoke(Unknown Source)
at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:188)
at $Proxy5.get(Unknown Source)
at de.xxx.test.CoreServicesRemoteTest.testCompanyCreate(CoreServicesRemoteTest.java:39)
at de.xxx.test.CoreServicesRemoteTest.main(CoreServicesRemoteTest.java:50)
at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
at $Proxy6.invoke(Unknown Source)
at org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:188)
at $Proxy5.get(Unknown Source)
at de.xxx.test.CoreServicesRemoteTest.testCompanyCreate(CoreServicesRemoteTest.java:39)
at de.xxx.test.CoreServicesRemoteTest.main(CoreServicesRemoteTest.java:50)

This is because, during unmarshalling, the AOPSingletonBasedContainer.dynamicInvoke does not use the container's classloader.

See the referenced forum thread for details.