We have the same issue using the simplest workflow here : <state name="validateIn20seconds"> | <transition name="" to="validated" /> | <transition name="missed" to="notvalidated" /> | <timer duedate="20 seconds" transition="missed"> | <action class="action.DoNothing" /> | </timer> | </state> | <state name="validated"> | <transition name="" to="end"></transition> | </state> | <state name="notvalidated"> | <transition name="" to="end"></transition> | </state> | We're using the SchedulerServlet to execute timers so the error is not due to your mechanism. We obtain the same error : INFO: runtime exception while executing timers | java.lang.NullPointerException | at org.jbpm.graph.def.GraphElement.getRuntimeActionsForEvent(GraphElement.java:259) | at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:186) | 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.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:147) | at org.jbpm.graph.node.State$$EnhancerByCGLIB$$d55a4606.fireAndPropagateEvent(<generated>) | at org.jbpm.scheduler.exe.Timer.execute(Timer.java:77) | at org.jbpm.scheduler.impl.SchedulerThread.executeTimers(SchedulerThread.java:118) | at org.jbpm.scheduler.impl.SchedulerThread.run(SchedulerThread.java:70) No idea what the solution is ... We're using Jbpm as recommended by the docs. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4013496#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...