1 Reply Latest reply on Jun 22, 2011 11:39 AM by Francesco Pietrobelli

    Unable to load session snapshot

    Francesco Pietrobelli Newbie

      Hi,

      i have a problem about persistence that i don't know how to resolve it. Particularly i'm not able to load a session with some facts into an entry point of working memory.

       

      I have attached a very simple eclipse project in which there is only one rule file and one java class:

      In the rule file i define a entry-point called "eventStream"

       

       

      In java class inside a single transaction i:

      1. create a StatefulKnowledgeSession
      2. add some facts in entry point
      3. dispose session

      After that in another transaction i try to load the session, but the following exception is thrown

       

      java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException

          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:103)

          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.loadStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:71)

          at org.drools.persistence.jpa.JPAKnowledgeService.loadStatefulKnowledgeSession(JPAKnowledgeService.java:118)

          at jpaSession.TestJPASession.loadKnowledgeSession(TestJPASession.java:148)

          at jpaSession.TestJPASession.testLoadSessionWithFactsInEntryPoint(TestJPASession.java:97)

          at jpaSession.TestJPASession.main(TestJPASession.java:65)

      Caused by: java.lang.reflect.InvocationTargetException

          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

          at java.lang.reflect.Constructor.newInstance(Constructor.java:532)

          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:88)

          ... 5 more

      Caused by: java.lang.RuntimeException: Unable to load session snapshot

          at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:96)

          at org.drools.persistence.SingleSessionCommandService.initKsession(SingleSessionCommandService.java:196)

          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:160)

          ... 10 more

      Caused by: java.lang.NullPointerException

          at org.drools.reteoo.LeftTuple.<init>(LeftTuple.java:158)

          at org.drools.reteoo.LeftTuple.<init>(LeftTuple.java:144)

          at org.drools.marshalling.impl.InputMarshaller.readLeftTuple(InputMarshaller.java:599)

          at org.drools.marshalling.impl.InputMarshaller.readFactHandles(InputMarshaller.java:372)

          at org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:220)

          at org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:92)

          at org.drools.persistence.SessionMarshallingHelper.loadSnapshot(SessionMarshallingHelper.java:91)

          ... 12 more

       

      the problem occurs only when i dispose the session with some facts in entry-point, if i insert some facts in workingmemory everything works fine.

       

      does anyone have any suggestion?

       

      i'm using jBPM 5.1 CR1