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[m2e-users] ClassCastException when updating project configuration
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Hey.
Wasn't quite sure how you want to handle bugs in the 0.13
builds of m2e. But it seems the latest milestone and
nightly both have a problem that results in a silent error
when I am trying to update my project configuration. In
the Eclipse Error Log this can been seen:
java.lang.ClassCastException:
org.eclipse.core.internal.resources.Folder cannot be cast
to org.eclipse.core.resources.IProject
at
org.eclipse.m2e.core.ui.internal.dialogs.UpdateDepenciesDialog.getMavenCodebases(UpdateDepenciesDialog.java:327)
at
org.eclipse.m2e.core.ui.internal.dialogs.UpdateDepenciesDialog.createDialogArea(UpdateDepenciesDialog.java:192)
at
org.eclipse.jface.dialogs.TitleAreaDialog.createContents(TitleAreaDialog.java:155)
at
org.eclipse.jface.window.Window.create(Window.java:431)
at
org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)
at org.eclipse.jface.window.Window.open(Window.java:790)
at
org.eclipse.m2e.core.ui.internal.actions.UpdateConfigurationAction.run(UpdateConfigurationAction.java:30)
at
org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
at
org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
at
org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
at
org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
at
org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at
org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at
org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
at
org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
at
org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at
org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at
org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at
org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at
org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
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:369)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
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:620)
at
org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
at org.eclipse.equinox.launcher.Main.main(Main.java:1384)
I *think* the problem is exactly what it says in the
JavaDoc for IWorkspaceRoot#getContainerForLocation:
"Warning: This method ignores linked resources and their
children. Since linked resources may overlap other
resources, a unique mapping from a file system location to
a single resource is not guaranteed. To find all resources
for a given location, including linked resources, use the
method findContainersForLocation."
And I have a couple of multi-module projects where each
child module is imported as a separate project. So it is
likely ending up with the folder that is inside the main
project instead of the project one.
/Kristoffer Peterhänsel
