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 Assignee: Konstantin Marmalyukov Priority: Critical Fix For: 4.2.2.Final, 4.3.0.Alpha1 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}