cannot be cast to org.jbpm.graph.def.ActionHandler

[ekotysh]

Hi,

I have a very simple handler that gets invoked when the timer fires.

Handler code:

import org.jbpm.graph.def.ActionHandler;
import org.jbpm.graph.exe.ExecutionContext;

public class OrderLockHandler implements ActionHandler {

        private static final long serialVersionUID = 1L;

	public void execute(ExecutionContext executionContext) throws Exception
	{
              System.out.println("Inside OrderLockHandler::execute()");
	}
}

This handler is inside a jar. I don't really know what is the proper way to deploy jars to the jboss server, so I copy this jar to
C:\jboss\jbpm-jpdl-3.2.3\server\server\jbpm\lib directory and start the server.

I create an instance of the process and when the timer fires, I receive the following exception:

Caused by: java.lang.ClassCastException: com.primolow.auction.jbpm.handler.OrderLockHandler cannot be cast to org.jbpm.graph.def.ActionHandler
        at org.jbpm.graph.def.Action.execute(Action.java:121)
        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:597)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173)
        at org.jbpm.graph.def.Action_$$_javassist_34.execute(Action_$$_javassist_34.java)
        at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:259)

My only guess was to check that the version of jbpm-jpdl.jar in jboss is the same as the one I linked against in my handler jar. They were the same.

Thanks for any help

[eren.aykin]

In cases where you get class cast exceptions using ActionHandler
or Action, you should try to use delegation instead of casting.

For example:

Node node = new Node("x");
Event event = new Event(Event.EVENTTYPE_x);
Delegation delegation = new Delegation("x.ActionHander");
Action action = new Action(delegation);
event.addAction(action);
node.addEvent(event);