Hi Maciej,
Thanks for your response.
I implemented persistence but I'm thinking that there might be configuration problems that's causing the error I have right now.
The exceptions I got are:
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
Regarding the database, is the databse implemented within JBPM? By using JPAKnowledgeService and EntityManager, does it has a specific database that stores the information I need?
I have attached the files in a zip folder in the original post, if you need any additional information.
Thanks a lot for offering your help and I look forward to hearing from you.
Best,
Bing