[jboss-user] [jBPM] - JPAWorkingMemoryDbLogger NullPointerException

Csaba K do-not-reply at jboss.com
Fri Mar 1 04:53:06 EST 2013


Csaba K [https://community.jboss.org/people/chabee] created the discussion

"JPAWorkingMemoryDbLogger NullPointerException"

To view the discussion, visit: https://community.jboss.org/message/800237#800237

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*Hi,*

*I am a newbie JBPM user and I would like to get history log.*
*I use JBPM v5.3,I tried it with a sapmle process, and I get the Exception below:*

Exception in thread "main" java.lang.NullPointerException
    at org.jbpm.process.audit.JPAWorkingMemoryDbLogger.addProcessLog(JPAWorkingMemoryDbLogger.java:90)
    at org.jbpm.process.audit.JPAWorkingMemoryDbLogger.logEventCreated(JPAWorkingMemoryDbLogger.java:65)
    at org.drools.audit.WorkingMemoryLogger.filterLogEvent(WorkingMemoryLogger.java:196)
    at org.drools.audit.WorkingMemoryLogger.beforeProcessStarted(WorkingMemoryLogger.java:421)
    at org.drools.event.ProcessEventSupport.fireBeforeProcessStarted(ProcessEventSupport.java:40)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:167)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:138)
    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:130)
    at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1077)
    at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:315)
    at com.sample.ProcessMain.main(ProcessMain.java:25)

*The java code:*
public class ProcessMain {

    public static final void main(String[] args) throws Exception {

        KnowledgeBase kbase = readKnowledgeBase();
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
*JPAWorkingMemoryDbLogger logger = new JPAWorkingMemoryDbLogger(ksession);*
        ksession.startProcess("com.sample.bpmn.hello");
*logger.dispose()*;
    }


    private static KnowledgeBase readKnowledgeBase() throws Exception {
        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add(ResourceFactory.newClassPathResource("sample.bpmn"), ResourceType.BPMN2);
        return kbuilder.newKnowledgeBase();
    }

}

*I use an in-memory H2 database, I created the three tables (process,node and variable log), the JTA datasource*
*is binded to this database in the jbpm-ds.xml file. My persistence.xml is the following:*

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence version="1.0"
             xsi:schemaLocation=" http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence
                                  http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
                                  http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm 
                                  http://java.sun.com/xml/ns/persistence/orm_1_0.xsd http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
             xmlns:orm=" http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm"
             xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"
             xmlns=" http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence">

  <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:jboss/datasources/jbpmDS</jta-data-source>       
    <mapping-file>META-INF/JBPMorm.xml</mapping-file>
    <mapping-file>META-INF/ProcessInstanceInfo.hbm.xml</mapping-file>

    <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
    <class>org.drools.persistence.info.SessionInfo</class>
    <class>org.drools.persistence.info.WorkItemInfo</class>

    <class>org.jbpm.process.audit.ProcessInstanceLog</class>
    <class>org.jbpm.process.audit.NodeInstanceLog</class>
    <class>org.jbpm.process.audit.VariableInstanceLog</class>

    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
      <property name="hibernate.max_fetch_depth" value="3"/>

      <property name="hibernate.hbm2ddl.auto" value="update" />
      <property name="hibernate.show_sql" value="false" />

      <!-- for AS7 -->
      <property name="hibernate.transaction.manager_lookup_class" value="org.jbpm.integration.console.JBPMTransactionManager" />
    </properties>        
  </persistence-unit>

</persistence>

*Thanks for your help!*

*Csaba*
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