the jpdl:

<task-node name="chief examine">
 <description>
 ??????
 </description>
 <task name="chief examine">
 <description>
 ????
 </description>
 <assignment class="demo.workflow.assignment.ChiefAssignment"></assignment>
 <controller>
 <variable access="read" name="reimbursementId" mapped-name="rid"></variable>
 </controller>
 </task>
 <transition to="requester fix the reimbursement form" name="need modify form"></transition>
 <transition to="decision" name="to result"></transition>
 </task-node>

<decision name="decision">
 <description>
 ????
 </description>
 <handler class="demo.workflow.action.DecisionProcess"></handler>
 <transition to="handle result" name="to result"></transition>
 <transition to="boss examine" name="to boss examine"></transition>
 <transition to="financial affairs process" name="to financial affairs process"></transition>
 </decision>

use this code to end the taskInstance:

public static void main(String[] args) {
 JbpmConfiguration config=JbpmConfiguration.getInstance();
 JbpmContext jbpmContext=config.createJbpmContext();

 TaskInstance ti = jbpmContext.getTaskInstance(18);

 ti.end("to result"); // this will go to the Decision node,cause exception
//ti.end("need modify form"); // if use this test, everything is ok.
 jbpmContext.close();


 }

when the process go to the Decision node , cause error.

15:56:21,764 [main] DEBUG Token : token[9] is unlocked by token[9]
15:56:21,780 [main] ERROR GraphElement : action threw exception: id to load is required for loading
java.lang.IllegalArgumentException: id to load is required for loading
 at org.hibernate.event.LoadEvent.<init>(LoadEvent.java:51)
 at org.hibernate.event.LoadEvent.<init>(LoadEvent.java:33)
 at org.hibernate.impl.SessionImpl.get(SessionImpl.java:812)
 at org.hibernate.impl.SessionImpl.get(SessionImpl.java:808)
 at demo.workflow.action.ProcessResultAction.execute(ProcessResultAction.java:24)
 at org.jbpm.graph.def.Action.execute(Action.java:122)
 at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:264)
 at org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:220)
 at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:190)
 at org.jbpm.graph.def.GraphElement.fireEvent(GraphElement.java:174)
 at org.jbpm.graph.def.Node.enter(Node.java:303)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$42da374e.enter(<generated>)
 at org.jbpm.graph.def.Transition.take(Transition.java:151)
 at org.jbpm.graph.def.Node.leave(Node.java:394)
 at org.jbpm.graph.exe.ExecutionContext.leaveNode(ExecutionContext.java:136)
 at org.jbpm.graph.node.Decision.execute(Decision.java:152)
 at org.jbpm.graph.def.Node.enter(Node.java:319)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$42da374e.enter(<generated>)
 at org.jbpm.graph.def.Transition.take(Transition.java:151)
 at org.jbpm.graph.def.Node.leave(Node.java:394)
 at org.jbpm.graph.node.TaskNode.leave(TaskNode.java:209)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.node.TaskNode$$EnhancerByCGLIB$$7edde70c.leave(<generated>)
 at org.jbpm.graph.exe.Token.signal(Token.java:195)
 at org.jbpm.graph.exe.Token.signal(Token.java:166)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.exe.Token$$EnhancerByCGLIB$$7233a4ca.signal(<generated>)
 at org.jbpm.taskmgmt.exe.TaskInstance.end(TaskInstance.java:488)
 at org.jbpm.taskmgmt.exe.TaskInstance.end(TaskInstance.java:427)
 at com.hundsun.bpm.console.Test.main(Test.java:20)
Exception in thread "main" org.jbpm.graph.def.DelegationException: id to load is required for loading
 at org.jbpm.graph.def.GraphElement.raiseException(GraphElement.java:387)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.def.ProcessDefinition$$EnhancerByCGLIB$$fe0fb99e.raiseException(<generated>)
 at org.jbpm.graph.def.GraphElement.raiseException(GraphElement.java:378)
 at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:281)
 at org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:220)
 at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:190)
 at org.jbpm.graph.def.GraphElement.fireEvent(GraphElement.java:174)
 at org.jbpm.graph.def.Node.enter(Node.java:303)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$42da374e.enter(<generated>)
 at org.jbpm.graph.def.Transition.take(Transition.java:151)
 at org.jbpm.graph.def.Node.leave(Node.java:394)
 at org.jbpm.graph.exe.ExecutionContext.leaveNode(ExecutionContext.java:136)
 at org.jbpm.graph.node.Decision.execute(Decision.java:152)
 at org.jbpm.graph.def.Node.enter(Node.java:319)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$42da374e.enter(<generated>)
 at org.jbpm.graph.def.Transition.take(Transition.java:151)
 at org.jbpm.graph.def.Node.leave(Node.java:394)
 at org.jbpm.graph.node.TaskNode.leave(TaskNode.java:209)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.node.TaskNode$$EnhancerByCGLIB$$7edde70c.leave(<generated>)
 at org.jbpm.graph.exe.Token.signal(Token.java:195)
 at org.jbpm.graph.exe.Token.signal(Token.java:166)
 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:585)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:157)
 at org.jbpm.graph.exe.Token$$EnhancerByCGLIB$$7233a4ca.signal(<generated>)
 at org.jbpm.taskmgmt.exe.TaskInstance.end(TaskInstance.java:488)
 at org.jbpm.taskmgmt.exe.TaskInstance.end(TaskInstance.java:427)
 at com.hundsun.bpm.console.Test.main(Test.java:20)
Caused by: java.lang.IllegalArgumentException: id to load is required for loading
 at org.hibernate.event.LoadEvent.<init>(LoadEvent.java:51)
 at org.hibernate.event.LoadEvent.<init>(LoadEvent.java:33)
 at org.hibernate.impl.SessionImpl.get(SessionImpl.java:812)
 at org.hibernate.impl.SessionImpl.get(SessionImpl.java:808)
 at demo.workflow.action.ProcessResultAction.execute(ProcessResultAction.java:24)
 at org.jbpm.graph.def.Action.execute(Action.java:122)
 at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:264)
 ... 41 more

how to solve this problem: id to load is required for loading.

any suggestion! thanks.