Extending designer: random error Nullpointer

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06-21-2013 12:41 PM
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:
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.
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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06-26-2013 01:26 PM
Moved to designer forum.

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06-27-2013 02:48 PM
This looks like some conflict between JDT and Designer when using the "link with editor" button in the project explorer. Can you test for us whether turning off that option solves the problem? It would help track down the problem, if we can do anything about it.

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07-08-2013 04:57 AM
hello.
actually i don't have the problem anymore. i think it may be related with the icon of a task that i made. Icon that was not 16x16. may that be the case?
actually i don't have the problem anymore. i think it may be related with the icon of a task that i made. Icon that was not 16x16. may that be the case?

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07-09-2013 08:14 AM
Could be, but from that particular stacktrace it seems unlikely.
