Eclipse Checkstyle Plug-in / Bugs (Deprecated - use Github) / #420 ClassCastException: net.sf.eclipsecs.ui.actions.PurgeCachesAction cannot be cast to org.eclipse.core.commands.IHandler

Andreas Sewe - 2017-07-18

Got virtually the same exception under Oxygen.R as well. So it’s not just broken in the milestone:

Exception:java.lang.ClassCastException: net.sf.eclipsecs.ui.actions.PurgeCachesAction cannot be cast to org.eclipse.core.commands.IHandler
at org.eclipse.ui.internal.handlers.HandlerProxy.loadHandler(HandlerProxy.java:350)
at org.eclipse.ui.internal.handlers.HandlerProxy.setEnabled(HandlerProxy.java:231)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.setEnabled(E4HandlerProxy.java:127)
at sun.reflect.GeneratedMethodAccessor3.invoke(null:-1)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:305)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:239)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.setEnabled(HandlerServiceHandler.java:80)
at org.eclipse.core.commands.Command.setEnabled(Command.java:862)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.canExecute(HandlerServiceImpl.java:179)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.canExecute(HandlerServiceImpl.java:165)
at org.eclipse.ui.internal.quickaccess.CommandProvider.getElements(CommandProvider.java:80)
at org.eclipse.ui.internal.quickaccess.QuickAccessProvider.getElementsSorted(QuickAccessProvider.java:55)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.computeMatchingEntries(QuickAccessContents.java:436)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.refresh(QuickAccessContents.java:143)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.lambda$2(QuickAccessContents.java:659)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:180)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4257)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1502)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1525)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1510)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1314)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4081)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3698)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1044)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
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:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)

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Lars Koedderitzsch - 2017-12-20

I don't seem to hit this error with Oxygen.1a and the latest plugin code. Please try 8.5.0 once it's out.

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Lars Koedderitzsch - 2017-12-20

status: open --> pending
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Andreas Sewe - 2017-12-20

Still seeeing this under Eclipse Photon M4 with Eclipse Checkstyle Plugin 8.0.0.201707161819.

STATUS

pluginId org.eclipse.ui
pluginVersion 3.109.100.v20171116-2149
code 0
severity 4
message The proxied handler was the wrong class
fingerprint 8b7964d9ec64027a6f6ae85132aa1083

Exception:java.lang.ClassCastException: net.sf.eclipsecs.ui.actions.PurgeCachesAction cannot be cast to org.eclipse.core.commands.IHandler
at org.eclipse.ui.internal.handlers.HandlerProxy.loadHandler(HandlerProxy.java:350)
at org.eclipse.ui.internal.handlers.HandlerProxy.setEnabled(HandlerProxy.java:231)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.setEnabled(E4HandlerProxy.java:127)
at sun.reflect.GeneratedMethodAccessor8.invoke(null:-1)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:305)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:239)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:133)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.setEnabled(HandlerServiceHandler.java:80)
at org.eclipse.core.commands.Command.setEnabled(Command.java:862)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.canExecute(HandlerServiceImpl.java:179)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.canExecute(HandlerServiceImpl.java:165)
at org.eclipse.ui.internal.quickaccess.CommandProvider.getElements(CommandProvider.java:80)
at org.eclipse.ui.internal.quickaccess.QuickAccessProvider.getElementsSorted(QuickAccessProvider.java:55)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.computeMatchingEntries(QuickAccessContents.java:436)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.refresh(QuickAccessContents.java:143)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.lambda$2(QuickAccessContents.java:659)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:180)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4270)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1509)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1532)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1517)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1321)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4094)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3711)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:681)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:595)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
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:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)

BUNDLES

name org.eclipse.core.commands
version 3.9.100.v20170607-0939

name org.eclipse.core.databinding.observable
version 1.6.200.v20171117-0856

name org.eclipse.core.databinding
version 1.6.200.v20171109-0840

name org.eclipse.core.runtime
version 3.14.0.v20171130-1004

name org.eclipse.e4.core.commands
version 0.12.200.v20171124-0847

name org.eclipse.e4.core.contexts
version 1.6.100.v20171130-1004

name org.eclipse.e4.core.di
version 1.6.200.v20171130-1004

name org.eclipse.e4.ui.workbench
version 1.6.0.v20170927-1521

name org.eclipse.e4.ui.workbench.swt
version 0.14.200.v20171016-0628

name org.eclipse.equinox.app
version 1.3.400.v20150715-1528

name org.eclipse.equinox.launcher
version 1.4.0.v20161219-1356

name org.eclipse.swt
version 3.107.0.v20171205-0742

name org.eclipse.ui
version 3.109.100.v20171116-2149

name org.eclipse.ui.ide.application
version 1.2.100.v20171120-1140

name org.eclipse.ui.ide
version 3.14.0.v20171204-0830

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Andreas Sewe - 2017-12-20

To reproduce: Go to the Quick Access bar in the upper right and enter some text. This causes Eclipse to load the command defintions and triggers the exception, logged as an error in the Error Log.

I also get a warning in the Error Log that might be related, as the same command is referenced:

Commands should really have a category: plug-in='net.sf.eclipsecs.ui', id='CheckstylePlugin.PurgeCaches', categoryId='net.sf.eclipsecs'

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Andreas Sewe - 2017-12-20

Please try 8.5.0 once it's out.

FYI, I tried building the current master (fcc935d3ed4e66cbd6777cd48535fb2c24ca449c; it’s still at version 8.0.0, correct?), installed from the locally build update site, and the problem still occurs under Photon M4.

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Lars Koedderitzsch - 2017-12-20

Latest changes are in this branch: https://sourceforge.net/p/eclipse-cs/git/ci/adopt_checkstyle_8.5/tree/

With your additional information I was able to reproduce and fix the issue.

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Lars Koedderitzsch - 2017-12-20

status: pending --> closed

assigned_to: Lars Koedderitzsch

Group: Future --> 8.5.0
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Andreas Sewe - 2017-12-20

Latest changes are in this branch: https://sourceforge.net/p/eclipse-cs/git/ci/adopt_checkstyle_8.5/tree/

Good to know.

With your additional information I was able to reproduce and fix the issue.

Awesome. Thanks.

Did you also manage to get rid of the warning I mentioned? (Commands should really have a category: plug-in='net.sf.eclipsecs.ui', id='CheckstylePlugin.PurgeCaches', categoryId='net.sf.eclipsecs')

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Lars Koedderitzsch - 2017-12-20

Did you also manage to get rid of the warning I mentioned?

Ah, yes I did, see https://sourceforge.net/p/eclipse-cs/bugs/428/ :-)

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#420 ClassCastException: net.sf.eclipsecs.ui.actions.PurgeCachesAction cannot be cast to org.eclipse.core.commands.IHandler

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