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Extending designer: random error Nullpointer

Question asked by esseti on Jun 21, 2013
Latest reply on Jul 9, 2013 by tiesebarrell
Hi all,
i'm trying to extend the editor with some task that i've to implment.
The problem is that sometimes it works, sometimes i have this error:


Problems occurred when invoking code from plug-in: "org.eclipse.jface".


java.lang.NullPointerException
   at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3095)
   at org.eclipse.ui.internal.WorkbenchPage.access$22(WorkbenchPage.java:3003)
   at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:2985)
   at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2981)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2940)
   at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2931)
   at org.eclipse.ui.ide.IDE.openEditor(IDE.java:655)
   at org.eclipse.ui.ide.IDE.openEditor(IDE.java:614)
   at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:360)
   at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:167)
   at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:249)
   at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228)
   at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:275)
   at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:251)
   at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:376)
   at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:538)
   at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
   at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866)
   at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
   at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
   at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
   at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864)
   at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152)
   at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256)
   at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275)
   at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269)
   at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309)
   at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
   at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4134)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1458)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1481)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1466)
   at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1271)
   at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3980)
   at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3619)
   at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1029)
   at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
   at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:923)
   at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
   at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
   at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
   at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
   at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
   at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
   at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
   at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
   at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
   at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
   at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
   at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
   at org.eclipse.equinox.launcher.Main.run(Main.java:1438)

this is the code i'm using: https://github.com/esseti/CroCo-Activiti-Task-UIs

PS: the editor wants to have access to the task implementation? beacuse i've to separated projects, so in the designer i just put the task classes.

ciao.

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