NullPointerException after signal token in Process State wit
kirq4e Jan 10, 2009 9:54 AMHi guys,
Recently me and my colleague started learning jBPM for our new project. I have started creating some processes to learn its capabilities.
We have developed a simple Parent-Children scenario.
The parent process is:
<?xml version="1.0" encoding="UTF-8"?> <process-definition xmlns="" name="ParentProcess"> <start-state name="start"> <transition to="SetInputVariable" name="toSetInputVariable"></transition> </start-state> <process-state name="InvokeChildProcess"> <sub-process name="ChildProcess" binding="late"></sub-process> <variable access="read" name="parentKey"></variable> <variable access="read,write" name="lastVisitedProcess"></variable> <transition to="PrintVariables" name="toPrintVariables"></transition> </process-state> <node name="SetInputVariable"> <action class="com.sirma.ecs2.test.subprocess.actions.SetInputVariables"></action> <transition to="InvokeChildProcess" name="toInvokeChildProcess"></transition> </node> <node name="PrintVariables"> <action class="com.sirma.ecs2.test.subprocess.actions.PrintVariables"></action> <transition to="end" name="toEnd"></transition> </node> <end-state name="end"></end-state> </process-definition>
The child process is:
<?xml version="1.0" encoding="UTF-8"?> <process-definition xmlns="" name="ChildProcess"> <start-state name="start"> <transition to="Reset Variables" name="toResetVariables"></transition> </start-state> <node name="Reset Variables"> <action name="Reset Variables" class="com.sirma.ecs2.test.subprocess.actions.ResetVariables"></action> <transition to="WaitSignal" name="toWaitSignal"></transition> </node> <state name="WaitSignal"> <transition to="end" name="toEnd"> <action class="com.sirma.ecs2.test.subprocess.actions.ExitWait"></action> </transition> </state> <end-state name="end"></end-state> </process-definition>
I start a Parent process and signal it the Token stops at the child`s State node: WaitSignal.
The Root token of the parent node is in InvokeChildProcess. The ActionHandlers are very simple just print a message and work with some variables.
If i try to signal the Parent process`s root node i got a NullPointerException:
Caused by: java.lang.NullPointerException at org.jbpm.graph.node.ProcessState.leave(ProcessState.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:585) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173) at org.jbpm.graph.def.Node_$$_javassist_49.leave(Node_$$_javassist_49.java) at org.jbpm.graph.exe.Token.signal(Token.java:192) at org.jbpm.graph.exe.Token.signal(Token.java:140) 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.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:173) at org.jbpm.graph.exe.Token_$$_javassist_64.signal(Token_$$_javassist_64.java) at com.kpenev.test.TestBean.signalToken(Unknown Source)
Probably the right token that i have to signal is the token of the subprocess, but i don`t think that such an exception should occur.
The code that i execute is:
JbpmContext jbpmContext = JbpmConfiguration.getInstance() .createJbpmContext(); try { ProcessInstance instance = jbpmContext.getGraphSession() .loadProcessInstance(instanceID); instance.getRootToken().signal(); } finally { jbpmContext.close(); }
The code that really works is:
JbpmContext jbpmContext = JbpmConfiguration.getInstance() .createJbpmContext(); try { ProcessInstance instance = jbpmContext.getGraphSession() .loadProcessInstance(instanceID); instance.getRootToken().getSubProcessInstance().getRootToken() .signal(); } finally { jbpmContext.close(); }
I`m using jbpm-3.3.0.GA version and jboss-4.2.3.GA.
I debuged it and the subProcessInstance variable at ExecutionContext isn`t set.
Hope there is a solution for this, because in the near future i have to develop a very complex processes including subprocesses.