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How to get data from Multiple-instance subprocess node?
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created by <a href="https://community.jboss.org/people/taurus">Evgene Ostapenko</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/725589#725589">View the full discussion</a>
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<div class="jive-rendered-content"><p>I have a Multiple-instance node for which i have specified CollectionExpression and VariableName parameters:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>CollectionExpression: list</p><p>VariableName: item</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>After starting a system creates several subproceses. Each of them can access its own<span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;"> element from the collection by using a variable given as VariableName. I pass an Object elements in collection and use such parameter mapping:</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;"><br/></span></p><table border="1" cellpadding="3" cellspacing="0" class="jiveBorder" style="width: 100%; border: 1px solid #000000;"><tbody><tr><th align="center" style="border:1px solid black;border: 1px solid #000000;background-color: #6690bc;" valign="middle"><span style="color: #ffffff;"><strong style="text-align: justify; font-size: 12px; font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif;">Sub-process variable</strong></span></th><th align="center" style="border:1px solid black;border: 1px solid #000000;background-color: #6690bc;" valign="middle"><span style="color: #ffffff;"><strong>Process variable</strong></span></th></tr><tr><td style="border:1px solid black;border: 1px solid #000000;"><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">username                    </span></td><td style="border:1px solid black;border: 1px solid #000000;">item.username</td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">It works. I can use "username" in the subprocess. But when i tried to return its value to the main process and set a result mapping</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table border="1" cellpadding="3" cellspacing="0" class="jiveBorder" style="width: 100%; border: 1px solid #000000;"><tbody><tr><th align="center" style="border:1px solid black;border: 1px solid #000000;background-color: #6690bc;" valign="middle"><span style="color: #ffffff;"><strong style="text-align: justify; font-size: 12px; font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif;">Sub-process variable</strong></span></th><th align="center" style="border:1px solid black;border: 1px solid #000000;background-color: #6690bc;" valign="middle"><span style="color: #ffffff;"><strong>Process variable</strong></span></th></tr><tr><td style="border:1px solid black;border: 1px solid #000000;"><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">username                    </span></td><td style="border:1px solid black;border: 1px solid #000000;"><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">item.username</span></td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">i get the message at start of the application:</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">There is no ID/IDREF binding for IDREF 'item.username'.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>After executing a subprocess, exception happens:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #ff0000;">ould not find variable scope for variable item.username</span></p><p><span style="color: #ff0000;">when trying to complete SubProcess node Sub-Process</span></p><p><span style="color: #ff0000;">Continuing without setting variable.</span></p><p><span style="color: #ff0000;">Could not find variable scope for variable item.outcoming_doc_id</span></p><p><span style="color: #ff0000;">when trying to complete SubProcess node Sub-Process</span></p><p><span style="color: #ff0000;">Continuing without setting variable.</span></p><p><span style="color: #ff0000;">java.lang.NullPointerException</span></p><p><span style="color: #ff0000;">          at com.sample.BPMTaskHandler.executeWorkItem(BPMTaskHandler.java:32)</span></p><p><span style="color: #ff0000;">          at org.drools.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:70)</span></p><p><span style="color: #ff0000;">          at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:105)</span></p><p><span style="color: #ff0000;">          at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'Lucida Grande', Geneva, Verdana, Arial, sans-serif; font-size: 12px; text-align: justify;">How can i write a working result mapping in this case?<br/></span></p></div>
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