Edited the file outside of the plugin, but is valid. Now I get a stack trace 
when opening the file. The definition executes properly.
Version is:
JBoss Inc.      JBoss jBPM JPDL Designer ...    3.1.0.SP1       org.jbpm.gd.jpdl

Stack trace is below.

  | 
  | java.lang.NullPointerException
  |     at org.jbpm.gd.common.editor.Editor.getSemanticElement(Unknown Source)
  |     at org.jbpm.gd.common.editor.Editor.initSourcePage(Unknown Source)
  |     at org.jbpm.gd.common.editor.Editor.createPages(Unknown Source)
  |     at org.jbpm.gd.jpdl.editor.JpdlEditor.createPages(Unknown Source)
  |     at 
org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:283)
  |     at 
org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661)
  |     at 
org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426)
  |     at 
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592)
  |     at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:299)
  |     at 
org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:179)
  |     at 
org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
  |     at 
org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
  |     at 
org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:400)
  |     at 
org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)
  |     at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209)
  |     at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1604)
  |     at org.eclipse.ui.internal.PartStack.add(PartStack.java:499)
  |     at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
  |     at org.eclipse.ui.internal.PartStack.add(PartStack.java:485)
  |     at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
  |     at 
org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63)
  |     at 
org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:217)
  |     at 
org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207)
  |     at 
org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:774)
  |     at 
org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:673)
  |     at 
org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:634)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2719)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2633)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.access$12(WorkbenchPage.java:2625)
  |     at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2577)
  |     at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2572)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2556)
  |     at 
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2547)
  |     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:644)
  |     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:603)
  |     at 
org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:285)
  |     at 
org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:138)
  |     at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:194)
  |     at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:175)
  |     at 
org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:268)
  |     at 
org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:244)
  |     at 
org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:316)
  |     at 
org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:613)
  |     at 
org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820)
  |     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
  |     at org.eclipse.core.runtime.Platform.run(Platform.java:857)
  |     at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:46)
  |     at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:193)
  |     at 
org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818)
  |     at 
org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079)
  |     at 
org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183)
  |     at 
org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263)
  |     at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257)
  |     at 
org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:297)
  |     at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
  |     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
  |     at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
  |     at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
  |     at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
  |     at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
  |     at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
  |     at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
  |     at 
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
  |     at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
  |     at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
  |     at 
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
  |     at 
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:153)
  |     at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
  |     at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
  |     at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
  |     at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
  |     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  |     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  |     at java.lang.reflect.Method.invoke(Unknown Source)
  |     at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:504)
  |     at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)
  |     at org.eclipse.equinox.launcher.Main.run(Main.java:1169)
  |     at org.eclipse.equinox.launcher.Main.main(Main.java:1144)
  | 
process definition file is below.

  | <?xml version="1.0" encoding="UTF-8"?>
  | <process-definition xmlns="urn:jbpm.org:jpdl-3.2" name="safe_harbor_">
  |     <start-state name="start">
  |             <transition name="" to="setup"/>
  |     </start-state>
  |     <end-state name="end"/>
  |     <task-node name="setup">
  |             <task name="shw_entry1">
  |                     <controller>
  |                             <variable name="plan_number" 
access="read,write,required"/>
  |                             <variable name="part_id" 
access="read,write,required"/>
  |                             <variable name="omni_text_file_name" 
access="read,write,required"/>
  |                     </controller>
  |             </task>
  |             <event type="node-leave">
  |                     <action name="action_get_setup_info" 
class="com.sungard.omni.fluid.action.OmniCustomVarAction"/>
  |                     <action name="action-ddweb" 
class="com.sungard.omni.fluid.action.OmniDDWebAction">
  |                             <responseString/>
  |                     </action>
  |                     <action name="action_xpath_test" 
class="com.sungard.omni.fluid.action.XPathVariableSetter">
  |                             <variableName>part_name_test</variableName>
  |                             <calcFileName>DDWEB1</calcFileName>
  |                             <expression>/xml/participant/DE011</expression>
  |                     </action>
  |                     <action name="action_xpath_size" 
class="com.sungard.omni.fluid.action.XPathExpression">
  |                             <variableName>parms_size</variableName>
  |                             <calcFileName>DDWEB1</calcFileName>
  |                             <expression>/xml/parms/*</expression>
  |                     </action>
  |                     <action name="action_xpath_test_parms_1" 
class="com.sungard.omni.fluid.action.XPathVariableSetter">
  |                             <variableName>parm1</variableName>
  |                             <calcFileName>DDWEB1</calcFileName>
  |                             <expression>/xml/parms/parm[1]</expression>
  |                     </action>
  |                     <action name="action_xpath_test_parms_2" 
class="com.sungard.omni.fluid.action.XPathVariableSetter">
  |                             <variableName>parm2</variableName>
  |                             <calcFileName>DDWEB1</calcFileName>
  |                             <expression>/xml/parms/parm[2]</expression>
  |                     </action>
  |                     <action name="action_xpath_test_parms_3" 
class="com.sungard.omni.fluid.action.XPathVariableSetter">
  |                             <variableName>parm3</variableName>
  |                             <calcFileName>DDWEB1</calcFileName>
  |                             <expression>/xml/parms/parm[3]</expression>
  |                     </action>
  |             </event>
  |             <event type="node-enter">
  |                     <action name="action_set_text_file_name" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>omni_text_file_name</variableName>
  |                             <variableValue>FLUID_SHW_SETUP</variableValue>
  |                     </action>
  |                     <action name="action_set_plan_number" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>plan_number</variableName>
  |                             <variableValue>LN0020</variableValue>
  |                     </action>
  |                     <action name="action_set_part_id" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>part_id</variableName>
  |                             <variableValue> </variableValue>
  |                     </action>
  |                     <action name="action_set_calc_file" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>CALCFILE</variableName>
  |                             <variableValue>DDWEB1</variableValue>
  |                     </action>
  |                     <action name="action_set_ddweb_plan_number" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>PLANNUM</variableName>
  |                             <variableValue>LN0020</variableValue>
  |                     </action>
  |                     <action name="action_set_ddweb_parm" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>
  |                                     DDWEB_PARM1
  |                             </variableName>
  |                             <variableValue>
  |                                     HELLO
  |                             </variableValue>
  |                     </action>
  |             </event>
  |             <transition name="" to="ifSafeHarbor"/>
  |     </task-node>
  |     <decision name="ifSafeHarbor">
  |             <transition name="no" to="WdrlAmt">
  |                     <condition>#{safe_harbor_plan=='NO'}</condition>
  |             </transition>
  |             <transition name="yes" to="SafeHarbor">
  |                     <condition>#{safe_harbor_plan=='YES'}</condition>
  |             </transition>
  |     </decision>
  |     <task-node name="SafeHarbor">
  |             <task name="shw_msg"/>
  |             <event type="node-enter">
  |                     <action name="action_set_message" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>message</variableName>
  |                             <variableValue>Can't do withdrawal on a Safe 
Harbor Plan !!</variableValue>
  |                     </action>
  |             </event>
  |             <transition name="" to="end"/>
  |     </task-node>
  |     <task-node name="WdrlAmt">
  |             <task name="shw_amt">
  |                     <controller>
  |                             <variable name="amt" 
access="read,write,required"/>
  |                             <variable name="payment_type" 
access="read,write,required"/>
  |                     </controller>
  |             </task>
  |             <!--comment-->
  |             <event type="node-enter">
  |                     <action name="action_set_amt" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>WK001</variableName>
  |                             <variableValue>0.00</variableValue>
  |                     </action>
  |                     <action name="action_set_tran" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>TX003</variableName>
  |                             <variableValue>444</variableValue>
  |                     </action>
  |             </event>
  |             <transition name="" to="isWire"/>
  |     </task-node>
  |     <task-node name="WireInfo">
  |             <task name="shw_wire">
  |                     <controller>
  |                             <variable name="TX010" 
access="read,write,required"/>
  |                             <variable name="TX011" 
access="read,write,required"/>
  |                     </controller>
  |             </task>
  |             <event type="node-enter">
  |                     <action name="action_set_transit_routing" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>TX010</variableName>
  |                             <variableValue/>
  |                     </action>
  |             </event>
  |             <event type="node-enter">
  |                     <action name="action_set_account_number" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>TX011</variableName>
  |                             <variableValue/>
  |                     </action>
  |             </event>
  |             <event type="node-leave">
  |                     <action name="action_set_do_wire" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>TX006</variableName>
  |                             <variableValue>YES</variableValue>
  |                     </action>
  |             </event>
  |             <transition name="" to="AddTransactions"/>
  |     </task-node>
  |     <node name="AddTransactions">
  |             <action class="com.sungard.omni.fluid.action.OmniScriptAction"/>
  |             <event type="node-leave">
  |                     <action name="action_set_message" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>message</variableName>
  |                             <variableValue>Hardship Withdrawal submitted 
for  processing</variableValue>
  |                     </action>
  |             </event>
  |             <event type="node-enter">
  |                     <action name="action_set_omni_text_file" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>omni_text_file_name</variableName>
  |                             <variableValue>FLUID_SHW_ADD_T</variableValue>
  |                     </action>
  |             </event>
  |             <transition name="" to="Confirmation"/>
  |     </node>
  |     <decision name="isWire">
  |             <event type="node-leave">
  |                     <action name="action_set_do_wire" 
class="com.sungard.omni.fluid.action.VariableSetterAction">
  |                             <variableName>TX006</variableName>
  |                             <variableValue>NO</variableValue>
  |                     </action>
  |             </event>
  |             <transition name="yes" to="WireInfo">
  |                     <condition>#{type=='wire'}</condition>
  |             </transition>
  |             <transition name="no" to="AddTransactions">
  |                     <condition>#{type=='check'}</condition>
  |             </transition>
  |     </decision>
  |     <task-node name="Confirmation">
  |             <task name="shw_confirm">
  |                     <controller>
  |                             <variable name="message" access="read"/>
  |                     </controller>
  |             </task>
  |             <transition name="" to="end"/>
  |     </task-node>
  | </process-definition>
  | 

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