Hello,
I have a jboss-client which shows a swing-UI and thus performs calls to
the application server in a separate thread. My only busines-logic call
is handleEvent(aEvent) and I have the following code in run():
--------8<------8<------------
Collection changedModels = null;
synchronized(controller) {
ClientController cc = controller.getClientController();
changedModels = cc.handleEvent(event);
}
--------8<------8<------------
The variable controller is a static one and checked for != null. I tried
to synchronize on cc too, but no help. I tried to synchronize the
whole handleEvent() method on both client and server side, no change.
Every time I get an exception like this:
--------8<------8<------------
[junit] java.rmi.ServerException: RemoteException occurred in server
thread; nested exception is:
[junit] java.rmi.RemoteException: Application Error: no concurrent
calls on stateful beans
[junit] java.rmi.RemoteException: Application Error: no concurrent calls
on stateful beans
[junit] at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:245)
[junit] at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)
[junit] at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
[junit] at
org.jboss.ejb.plugins.jrmp.server.JRMPContainerInvoker_Stub.invoke(Unknown
Source)
[junit] at
org.jboss.ejb.plugins.jrmp.interfaces.GenericProxy.invokeContainer(GenericProxy.java:357)
[junit] at
org.jboss.ejb.plugins.jrmp.interfaces.StatefulSessionProxy.invoke(StatefulSessionProxy.java:136)
[junit] at $Proxy1.handleEvent(Unknown Source)
[junit] at
com.lambdalogic.messeinfo.control.application.HandleEventThread.run(HandleEventThread.java:83)
--------8<------8<------------
On creating the thread I even have a method to ensure only one thread is
created and running (so I get only the advantage of a GUI update if the
server is called):
--------8<------8<------------
if (eventThread != null && eventThread.isAlive()) {
try {
eventThread.join();
} catch (InterruptedException e) {
log.error("handleEvent()",e);
}
// the thread is dead here, e.g. all events are handled
}
eventThread = HandleEventThread.queueEvent(event,null);
eventThread.start();
--------8<------8<------------
Here is the queueEvent function:
--------8<------8<------------
static HandleEventThread queueEvent(MIEvent pEvent,
EventHandlerCallback pCallback) {
HandleEventThread newEvent = new HandleEventThread(pEvent,pCallback);
return newEvent;
}
--------8<------8<------------
BTW: if i put the two handleEvent() calls one after each other,
everything is fine. This is not a very useful way for me, because the
GUI may start some nasty action every time, thus issuing a new event for
the server...
Anybody out there with ideas?
Thanks a lot,
Frank
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