Bug 205655

Comment 1 Janusz Lembicz 2007-10-19 16:58:15 EDT

Created attachment 80803 [details]
Patch

Comment 2 Janusz Lembicz 2007-10-19 16:58:51 EDT

(In reply to comment #0)
> Found this NPE in the log. Sorry, didn't see when it was printed, but since
> NPEs are often easy to figure out, thought I would log anyway.
> !SESSION 2007-10-07 01:04:00.120
> -----------------------------------------------
> eclipse.buildId=I20070625-1500
> java.version=1.5.0_12
> java.vendor=Sun Microsystems Inc.
> BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_CA
> Framework arguments:  -product org.eclipse.sdk.ide -pdelaunch
> Command-line arguments:  -product org.eclipse.sdk.ide -data
> C:\dev\abstratt/../runtime-New_configuration -dev
> file:C:/dev/abstratt/.metadata/.plugins/org.eclipse.pde.core/Full/dev.properties
> -pdelaunch -os win32 -ws win32 -arch x86 -consolelog -console
> !ENTRY org.eclipse.ui 4 0 2007-10-07 01:02:06.595
> !MESSAGE Unhandled event loop exception
> !STACK 0
> org.eclipse.swt.SWTException: Failed to execute runnable
> (java.lang.NullPointerException)
>         at org.eclipse.swt.SWT.error(SWT.java:3563)
>         at org.eclipse.swt.SWT.error(SWT.java:3481)
>         at
> org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:126)
>         at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3659)
>         at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3296)
>         at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
>         at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
>         at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
>         at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
>         at
> org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
>         at
> org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
>         at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
>         at
> org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
>         at
> org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:153)
>         at
> org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
>         at
> org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
>         at
> org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
>         at
> org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
>         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:585)
>         at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:504)
>         at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)
>         at org.eclipse.equinox.launcher.Main.run(Main.java:1169)
>         at org.eclipse.equinox.launcher.Main.main(Main.java:1144)
> Caused by: java.lang.NullPointerException
>         at
> org.eclipse.pde.internal.ui.editor.plugin.ManifestEditorMatchingStrategy.matches(ManifestEditorMatchingStrategy.java:32)
>         at
> org.eclipse.ui.internal.EditorManager.findEditors(EditorManager.java:485)
>         at
> org.eclipse.ui.internal.EditorManager.findEditors(EditorManager.java:431)
>         at
> org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:394)
>         at
> org.eclipse.ui.internal.EditorManager.findEditor(EditorManager.java:376)
>         at
> org.eclipse.ui.internal.WorkbenchPage.findEditor(WorkbenchPage.java:1967)
>         at
> org.eclipse.ui.NavigationLocation.getEditorPart(NavigationLocation.java:44)
>         at
> org.eclipse.ui.NavigationLocation.getText(NavigationLocation.java:60)
>         at
> org.eclipse.ui.internal.NavigationHistoryEntry.<init>(NavigationHistoryEntry.java:49)
>         at
> org.eclipse.ui.internal.NavigationHistory.createEntry(NavigationHistory.java:655)
>         at
> org.eclipse.ui.internal.NavigationHistory.addEntry(NavigationHistory.java:371)
>         at
> org.eclipse.ui.internal.NavigationHistory.access$10(NavigationHistory.java:352)
>         at
> org.eclipse.ui.internal.NavigationHistory$2.run(NavigationHistory.java:199)
>         at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
>         at
> org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123)
>         ... 23 more

Hi. As you said this bug was easy to figure out. The problem was that it did not occur in my environment. I've assumed that NPE was triggered when an inputFile variable had been set to null by ResourceUtil.getFile(input) method when an instance of IEditorInput being passed as argument didn't guarantee that the resource does exist. I attach a patch which simply extends the conditional expression by adding inputFile!=null when the input is an instance of IFileEditorInput. This is my first bug so please be understanding ;]

Comment 3 Brian Bauman 2007-10-22 13:31:39 EDT

I could not reproduce this bug either, but your assumption seems to be correct.  If for some reason that is not the culprit of the NPE, this is definitely a good check that could save us in the future.

Janusz, thanks for your help and your educated guessing ;-)

Send me a photo with a leafy background if you would like to be included on the PDE Contributor page (http://www.eclipse.org/pde/pde-ui/committers/committers.php).  Thanks again for your help!