java.lang.AssertionError
   at org.netbeans.modules.bpel.mapper.model.DefaultBpelModelUpdater.createVariableXPath(DefaultBpelModelUpdater.java:234)
   at org.netbeans.modules.bpel.mapper.model.DefaultBpelModelUpdater.buildXPathExprList(DefaultBpelModelUpdater.java:295)
   at org.netbeans.modules.bpel.mapper.model.DefaultBpelModelUpdater.populateContentHolder(DefaultBpelModelUpdater.java:266)
   at org.netbeans.modules.bpel.mapper.model.BpelModelUpdater.updateFrom(BpelModelUpdater.java:284)
   at org.netbeans.modules.bpel.mapper.model.BpelModelUpdater.updateCopy(BpelModelUpdater.java:384)
   at org.netbeans.modules.bpel.mapper.model.BpelModelUpdater.updateAssign(BpelModelUpdater.java:430)
   at org.netbeans.modules.bpel.mapper.model.BpelModelUpdater.updateOnChanges(BpelModelUpdater.java:134)
   at org.netbeans.modules.bpel.mapper.model.BpelChangeProcessor$1.call(BpelChangeProcessor.java:61)
   at org.netbeans.modules.bpel.model.impl.BpelModelImpl.invoke(BpelModelImpl.java:237)
   at org.netbeans.modules.bpel.mapper.model.BpelChangeProcessor.processChanges(BpelChangeProcessor.java:59)
   at org.netbeans.modules.soa.xpath.mapper.model.XPathMapperModel.fireGraphChanged(XPathMapperModel.java:629)
   at org.netbeans.modules.soa.xpath.mapper.model.XPathMapperModel.doCopy(XPathMapperModel.java:468)
   at org.netbeans.modules.soa.xpath.mapper.model.XPathMapperModel.add(XPathMapperModel.java:411)
   at org.netbeans.modules.soa.xpath.mapper.palette.PaletteItem$1.actionPerformed(PaletteItem.java:90)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
   at java.awt.Component.processMouseEvent(Component.java:6263)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3255)
   at java.awt.Component.processEvent(Component.java:6028)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2475)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:133)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)