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Error message while using JPAKnowledgeService and how to do external Signaling with persistence
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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/751986#751986">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi, </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am trying to use persistence such that an external signaling can continue a workflow process that is in a wait-state. </p><p>(I plan on running SignalEvent.java after ProcessMain is in a wait state to trigger the signal node and continue with the workflow) </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a href="https://community.jboss.org/servlet/JiveServlet/showImage/2-751986-19148/externalSignaling.JPG"><span> https://community.jboss.org/servlet/JiveServlet/downloadImage/2-751986-19148/450-99/externalSignaling.JPG </span></a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>However, I get these errors when I run ProcessMain.java. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Exception in thread "main" java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException</p><p>          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:143)</p><p>          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:67)</p><p>          at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)</p><p>          at com.sample.ProcessMain.main(ProcessMain.java:62)</p><p>Caused by: java.lang.reflect.InvocationTargetException</p><p>          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)</p><p>          at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)</p><p>          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)</p><p>          at java.lang.reflect.Constructor.newInstance(Unknown Source)</p><p>          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:129)</p><p>          ... 3 more</p><p>Caused by: java.lang.NullPointerException</p><p>          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:168)</p><p>          ... 8 more</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>1) I read the documentations and it states:<br/><a class="jive-link-anchor-small"><span class="java_operator" style="color: #000000;">//</span><span class="java_plain" style="color: #000000;"> recreate the session from database using the sessionId</span><br/><br/><span class="java_plain" style="color: #000000;">ksession </span><span class="java_operator" style="color: #000000;">=</span><span class="java_plain" style="color: #000000;"> </span><span class="java_type" style="color: #000000;">JPAKnowledgeService</span><span class="java_separator" style="color: #000000;">.</span><span class="java_plain" style="color: #000000;">loadStatefulKnowledgeSession</span><span class="java_separator" style="color: #000000;">(</span><span class="java_plain" style="color: #000000;"> sessionId</span><span class="java_separator" style="color: #000000;">,</span><span class="java_plain" style="color: #000000;"> kbase</span><span class="java_separator" style="color: #000000;">,</span><span class="java_plain" style="color: #000000;"> </span><span class="java_literal" style="color: #2a00ff;">null</span><span class="java_separator" style="color: #000000;">,</span><span class="java_plain" style="color: #000000;"> env </span><span class="java_separator" style="color: #000000;">);</span></a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span class="java_separator" style="color: #000000;">Does the kbase has to be the original knowledgebase? or am I allowed to create a new knowledgebase but as long as the sessionId is correct, I can signal a bpmn workflow externally that is on a different knowledgebase?<br/></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2) Can someone elaborate what the error message means and how to do external signaling with persistence and JPAKnowledgeService? </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Any help is appreciated. Thanks! </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Best, <br/>Bing</p></div>
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