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JPAWorkingMemoryDbLogger NullPointerException
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created by <a href="https://community.jboss.org/people/chabee">Csaba K</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/800237#800237">View the full discussion</a>
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<div class="jive-rendered-content"><p><strong>Hi,</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>I am a newbie JBPM user and I would like to get history log.</strong></p><p><strong>I use JBPM v5.3,I tried it with a sapmle process, and I get the Exception below:</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Exception in thread "main" java.lang.NullPointerException</p><p>    at org.jbpm.process.audit.JPAWorkingMemoryDbLogger.addProcessLog(JPAWorkingMemoryDbLogger.java:90)</p><p>    at org.jbpm.process.audit.JPAWorkingMemoryDbLogger.logEventCreated(JPAWorkingMemoryDbLogger.java:65)</p><p>    at org.drools.audit.WorkingMemoryLogger.filterLogEvent(WorkingMemoryLogger.java:196)</p><p>    at org.drools.audit.WorkingMemoryLogger.beforeProcessStarted(WorkingMemoryLogger.java:421)</p><p>    at org.drools.event.ProcessEventSupport.fireBeforeProcessStarted(ProcessEventSupport.java:40)</p><p>    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:167)</p><p>    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:138)</p><p>    at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:130)</p><p>    at org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1077)</p><p>    at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:315)</p><p>    at com.sample.ProcessMain.main(ProcessMain.java:25)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>The java code:</strong></p><p>public class ProcessMain {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public static final void main(String[] args) throws Exception {</p><p>       </p><p>        KnowledgeBase kbase = readKnowledgeBase();</p><p>        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();</p><p>        <strong>JPAWorkingMemoryDbLogger logger = new JPAWorkingMemoryDbLogger(ksession);</strong></p><p>        ksession.startProcess("com.sample.bpmn.hello");</p><p>        <strong>logger.dispose()</strong>;</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private static KnowledgeBase readKnowledgeBase() throws Exception {</p><p>        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();</p><p>        kbuilder.add(ResourceFactory.newClassPathResource("sample.bpmn"), ResourceType.BPMN2);</p><p>        return kbuilder.newKnowledgeBase();</p><p>    }</p><p>    </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>I use an in-memory H2 database, I created the three tables (process,node and variable log), the JTA datasource</strong></p><p><strong>is binded to this database in the jbpm-ds.xml file. My persistence.xml is the following:</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><?xml version="1.0" encoding="UTF-8" standalone="yes"?></p><p><persistence version="1.0"</p><p><span>             xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence</a></p><p><span>                                 </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd</a></p><p><span>                                 </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/orm" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence/orm</a><span> </span></p><p><span>                                 </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/orm_1_0.xsd" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence/orm_1_0.xsd</a><span>"</span></p><p><span>             xmlns:orm="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/orm" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence/orm</a><span>"</span></p><p><span>             xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" rel="nofollow" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"</span></p><p><span>             xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" rel="nofollow" target="_blank">http://java.sun.com/xml/ns/persistence</a><span>"></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA"></p><p>    <provider>org.hibernate.ejb.HibernatePersistence</provider></p><p>    <jta-data-source>java:jboss/datasources/jbpmDS</jta-data-source>       </p><p>    <mapping-file>META-INF/JBPMorm.xml</mapping-file></p><p>    <mapping-file>META-INF/ProcessInstanceInfo.hbm.xml</mapping-file></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class></p><p>    <class>org.drools.persistence.info.SessionInfo</class></p><p>    <class>org.drools.persistence.info.WorkItemInfo</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <class>org.jbpm.process.audit.ProcessInstanceLog</class></p><p>    <class>org.jbpm.process.audit.NodeInstanceLog</class></p><p>    <class>org.jbpm.process.audit.VariableInstanceLog</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    <properties></p><p>      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/></p><p>      <property name="hibernate.max_fetch_depth" value="3"/></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>      <property name="hibernate.hbm2ddl.auto" value="update" /></p><p>      <property name="hibernate.show_sql" value="false" /></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>      <!-- for AS7 --></p><p>      <property name="hibernate.transaction.manager_lookup_class" value="org.jbpm.integration.console.JBPMTransactionManager" /></p><p>    </properties>        </p><p>  </persistence-unit></p><p>    </p><p></persistence></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>Thanks for your help!</strong></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>Csaba</strong></p></div>
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