I'm trying to call an EJB method on a JBoss server, passing it a reference to the
client object so that I can receive a callback. I used to have this working when we
were using Weblogic, but I can't seem to get it to work for JBoss.
The EJB's interface includes a nested interface that extends Remote:
| public interface TestEjb extends EJBObject {
| public void register(Callback callback) throws RemoteException;
|
| public interface Callback extends Remote {
| public void send(String message) throws RemoteException;
| }
| }
|
My client implements that interface:
| public class TestClient extends UnicastRemoteObject implements TestEjb.Callback {
| ...
| public void send(String message) {
| System.out.println("Message from server: '" + message + "'");
| }
| ...
| }
|
I expect to be able to pass "this" to TestEbj.register. However, I get an
IllegalArgumentException from the server, claiming that I am passing the wrong number
of arguments.
Steps to reproduce:
1) Get the source files here:
http://www.everybody.org/~jeremystein/code/CallbackTest.zip
2) Extract the zip file
3) The server directory contains the Test EJB. Deploy it on a JBoss server.
4) The EjbInterface.jar file contains these classes needed to compile the client.
- TestEjb$Callback.class
- TestEjb.class
- TestEjbHome.class
(You could create this jar yourself after compiling the EJB classes.)
5) Grab jbossall-client.jar from the jboss distribution (in the client directory). Put
it in the client directory.
6) CD to the client directory.
7) javac -d . -classpath EjbInterface.jar;jbossall-client.jar TestClient.java
8) rmic -classpath .;EjbInterface.jar;jbossall-client.jar
com.elementk.client.TestClient
9) java -classpath .;EjbInterface.jar;jbossall-client.jar
com.elementk.client.TestClient
Detailed exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception
is:
java.rmi.ServerException: RuntimeException; nested exception is:
java.lang.IllegalArgumentException: wrong number of arguments
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:292)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:534)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown
Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
at
org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:135)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:96)
at
org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:45)
at
org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:100)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:85)
at $Proxy2.register(Unknown Source)
at com.elementk.client.TestClient.main(TestClient.java:25)
Caused by: java.rmi.ServerException: RuntimeException; nested exception is:
java.lang.IllegalArgumentException: wrong number of arguments
at
org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:361)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:195)
at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:122)
at
org.jboss.ejb.StatelessSessionContainer.internalInvoke(StatelessSessionContainer.java:331)
at org.jboss.ejb.Container.invoke(Container.java:700)
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:324)
at
org.jboss.mx.capability.ReflectedMBeanDispatcher.invoke(ReflectedMBeanDispatcher.java:284)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:546)
at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:367)
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:324)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
at sun.rmi.transport.Transport$1.run(Transport.java:148)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:534)Caused by:
java.lang.IllegalArgumentException: wrong number of arguments
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:324)
at
org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:683)
at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:185)
at
org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:72)
at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:84)
at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:267)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:128)
at
org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:118)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:191)
... 21 more
If no one can tell me what's wrong with my code, perhaps someone can point me to a
complete example of RMI callback that works with JBoss.
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