Hi,
I am trying to use persistence such that an external signaling can continue a workflow process that is in a wait-state.
(I plan on running SignalEvent.java after ProcessMain is in a wait state to trigger the signal node and continue with the workflow)
https://community.jboss.org/servlet/JiveServlet/downloadImage/2-751986-19148/450-99/externalSignaling.JPG
However, I get these errors when I run ProcessMain.java.
Exception in thread "main" java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:143)
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:67)
at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)
at com.sample.ProcessMain.main(ProcessMain.java:62)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:129)
... 3 more
Caused by: java.lang.NullPointerException
at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:168)
... 8 more
1) I read the documentations and it states:
// recreate the session from database using the sessionId
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( sessionId, kbase, null, env );
Does the kbase has to be the original knowledgebase? or am I allowed to create a new knowledgebase but as long as the sessionId is correct, I can signal a bpmn workflow externally that is on a different knowledgebase?
2) Can someone elaborate what the error message means and how to do external signaling with persistence and JPAKnowledgeService?
Any help is appreciated. Thanks!
Best,
Bing
