Hi 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.
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