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    Re: Is it possible to get the StatefulKnowledgeSession/processInstance from solely its ID?
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    created by <a href="https://community.jboss.org/people/binglim">Bing Lim</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/752102#752102">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi Maciej, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>Thanks for your response. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>I implemented persistence but I'm thinking that there might be configuration problems that's causing the error I have right now. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>The exceptions I got are: </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:143)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:67)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at com.sample.ProcessMain.main(ProcessMain.java:62)</p><p>Caused by: java.lang.reflect.InvocationTargetException</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at java.lang.reflect.Constructor.newInstance(Unknown Source)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:129)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;... 3 more</p><p>Caused by: java.lang.NullPointerException</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;at org.drools.persistence.SingleSessionCommandService.&lt;init&gt;(SingleSessionCommandService.java:168)</p><p>&#160;&#160;&#160;&#160; &#160;&#160;&#160;&#160;&#160;... 8 more</p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>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?</p><p>I have attached the files in a zip folder in the original post, if you need any additional information. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>Thanks a lot for offering your help and I look forward to hearing from you. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;">&#160;</p><p>Best, <br/>Bing</p></div>

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