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Re: java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper
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created by <a href="https://community.jboss.org/people/kifayath">kifayath khan</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/757289#757289">View the full discussion</a>
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<div class="jive-rendered-content"><p>I am also getting same error , i am putting my code and error. Please help me</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>package com.sample;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.util.HashMap;</p><p>import java.util.Map;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.drools.KnowledgeBase;</p><p>import org.drools.builder.KnowledgeBuilder;</p><p>import org.drools.builder.KnowledgeBuilderFactory;</p><p>import org.drools.builder.ResourceType;</p><p>import org.drools.io.ResourceFactory;</p><p>import org.drools.logger.KnowledgeRuntimeLogger;</p><p>import org.drools.logger.KnowledgeRuntimeLoggerFactory;</p><p>import org.drools.runtime.StatefulKnowledgeSession;</p><p>import org.jbpm.process.workitem.wsht.HornetQHTWorkItemHandler;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>/**</p><p> * This is a sample file to launch a process.</p><p> */</p><p>public class ProcessTest {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>          public static final void main(String[] args) {</p><p>                    try {</p><p>                              // load up the knowledge base</p><p>                              KnowledgeBase kbase = readKnowledgeBase();</p><p>                              StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);</p><p>                              KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newThreadedFileLogger(ksession, "test", 1000);</p><p>                              // start a new process instance</p><p>                              Map<String, Object> params = new HashMap<String, Object>();</p><p>                              params.put("employee", "krisv");</p><p>                              params.put("reason", "Yearly performance evaluation");</p><p>                              ksession.startProcess("com.sample.evaluation", params);</p><p>                              System.out.println("Process started ...");</p><p>                              logger.close();</p><p>                    } catch (Throwable t) {</p><p>                              t.printStackTrace();</p><p>                    }</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("Evaluation.bpmn"), ResourceType.BPMN2);</p><p>                    return kbuilder.newKnowledgeBase();</p><p>          }</p><p>  </p><p>          private static StatefulKnowledgeSession createKnowledgeSession(KnowledgeBase kbase) {</p><p>                    StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();</p><p>                    HornetQHTWorkItemHandler humanTaskHandler = new HornetQHTWorkItemHandler(ksession);</p><p>                    humanTaskHandler.setIpAddress("127.0.0.1");</p><p>                    humanTaskHandler.setPort(5445);</p><p>                    ksession.getWorkItemManager().registerWorkItemHandler("Human Task", humanTaskHandler);</p><p>                    return ksession;</p><p>          }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>  </p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="background-color: #eef4f9; font-size: 12px; color: #555555; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">When I ran the code above, the first task executed fine, but the second task gives me:</p><p style="background-color: #eef4f9; font-size: 12px; color: #555555; font-family: 'Lucida Sans', 'Lucida Sans Unicode', 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif;">     java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>Process started ...</p><p>Exception in thread "Thread-3" java.lang.ClassCastException: java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper</p><p>          at org.jbpm.task.utils.ContentMarshallerHelper.unmarshall(ContentMarshallerHelper.java:157)</p><p>          at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:208)</p><p>          at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler$1.run(GenericHTWorkItemHandler.java:187)</p><p>          at java.lang.Thread.run(Thread.java:722)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p></blockquote></div>
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