[jbosstools-issues] [JBoss JIRA] (JBIDE-18572) NPE while calling a diff between 2 versions of a JS file

[Xavier Coulon (JIRA)]

Xavier Coulon created JBIDE-18572:
-------------------------------------

             Summary: NPE while calling a diff between 2 versions of a JS file
                 Key: JBIDE-18572
                 URL: https://issues.jboss.org/browse/JBIDE-18572
             Project: Tools (JBoss Tools)
          Issue Type: Bug
          Components: visual-page-editor-core
    Affects Versions: 4.2.0.CR1
            Reporter: Xavier Coulon
            Priority: Critical


Not sure if the error is related {{summarry}}, but here's the stacktrace:
I did compare my current JS file with the first version in my history, which was an empty file, then I called the diff with the next version and I got this error. I kept having this error when comparing the current version with any other version of the file (if that can help to reproduce/identify the problem)

{code}
java.lang.NullPointerException
	at org.jboss.tools.vpe.preview.editor.VpvEditor.formRequestToServer(VpvEditor.java:572)
	at org.jboss.tools.vpe.preview.editor.VpvEditor.access$0(VpvEditor.java:551)
	at org.jboss.tools.vpe.preview.editor.VpvEditor$EditorListener.partInputChanged(VpvEditor.java:674)
	at org.eclipse.ui.internal.WorkbenchPage$28.run(WorkbenchPage.java:5151)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.WorkbenchPage.firePartInputChanged(WorkbenchPage.java:5148)
	at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart$4.propertyChanged(CompatibilityPart.java:369)
	at org.eclipse.ui.part.WorkbenchPart.firePropertyChange(WorkbenchPart.java:132)
	at org.eclipse.compare.internal.CompareEditor.doSetInput(CompareEditor.java:313)
	at org.eclipse.compare.internal.CompareEditor.setInput(CompareEditor.java:254)
	at org.eclipse.compare.internal.CompareUIPlugin$1.run(CompareUIPlugin.java:546)
	at org.eclipse.compare.internal.CompareUIPlugin.syncExec(CompareUIPlugin.java:1413)
	at org.eclipse.compare.internal.CompareUIPlugin.internalOpenEditor(CompareUIPlugin.java:567)
	at org.eclipse.compare.internal.CompareUIPlugin.openEditorInBackground(CompareUIPlugin.java:537)
	at org.eclipse.compare.internal.CompareUIPlugin.openCompareEditor(CompareUIPlugin.java:526)
	at org.eclipse.compare.CompareUI.reuseCompareEditor(CompareUI.java:199)
	at org.eclipse.compare.CompareUI.reuseCompareEditor(CompareUI.java:180)
	at org.eclipse.team.internal.ui.actions.CompareRevisionAction.openInCompare(CompareRevisionAction.java:139)
	at org.eclipse.team.internal.ui.actions.CompareRevisionAction.run(CompareRevisionAction.java:102)
	at org.eclipse.team.internal.ui.history.LocalHistoryPage$9.open(LocalHistoryPage.java:414)
	at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:853)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:178)
	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:850)
	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1142)
	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1249)
	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:278)
	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:272)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:313)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4188)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1467)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1490)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1475)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1279)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4031)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3658)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:484)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
{code}



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