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Steps to reproduce * start fresh/clean java epp 20110317-0706 3.7M7 distro (currently available from http://build.eclipse.org/technology/epp/epp_build/indigo/download/20110317-0706/) * open maven import wizard and point at local maven 3.0.3 checkout * go to the second page to see additional software proposed for installation * finish the wizard Problem: UI is completely blocked for a few minutes. Operating system (linux in my case) marks eclipse as not responding. Eventually, P2 install dialog does show up and it is possible to complete the installation and project import. Here is the stacktrace of the UI thread while it is in the locked state "main" prio=10 tid=0x000000004150f000 nid=0x1737 waiting on condition [0x00007f37c8aed000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.eclipse.core.internal.jobs.JobManager.join(JobManager.java:925) at org.eclipse.equinox.internal.p2.transport.ecf.FileReader.readInto(FileReader.java:296) at org.eclipse.equinox.internal.p2.transport.ecf.RepositoryTransport.download(RepositoryTransport.java:80) at org.eclipse.equinox.internal.p2.transport.ecf.RepositoryTransport.download(RepositoryTransport.java:130) at org.eclipse.equinox.internal.p2.repository.CacheManager.updateCache(CacheManager.java:333) at org.eclipse.equinox.internal.p2.repository.CacheManager.createCache(CacheManager.java:205) at org.eclipse.equinox.internal.p2.metadata.repository.SimpleMetadataRepositoryFactory.getLocalFile(SimpleMetadataRepositoryFactory.java:66) at org.eclipse.equinox.internal.p2.metadata.repository.SimpleMetadataRepositoryFactory.load(SimpleMetadataRepositoryFactory.java:88) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.factoryLoad(MetadataRepositoryManager.java:57) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:747) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:652) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:96) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository.addChild(CompositeMetadataRepository.java:153) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository.<init>(CompositeMetadataRepository.java:106) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepositoryFactory.load(CompositeMetadataRepositoryFactory.java:122) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.factoryLoad(MetadataRepositoryManager.java:57) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:747) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:652) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:96) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.p2.engine.ProvisioningContext.loadMetadataRepository(ProvisioningContext.java:211) at org.eclipse.equinox.p2.engine.ProvisioningContext.getLoadedMetadataRepositories(ProvisioningContext.java:194) at org.eclipse.equinox.p2.engine.ProvisioningContext.getMetadata(ProvisioningContext.java:275) at org.eclipse.equinox.internal.p2.director.SimplePlanner.gatherAvailableInstallableUnits(SimplePlanner.java:258) at org.eclipse.equinox.internal.p2.director.SimplePlanner.getSolutionFor(SimplePlanner.java:318) at org.eclipse.equinox.internal.p2.director.SimplePlanner.getProvisioningPlan(SimplePlanner.java:376) at org.eclipse.equinox.internal.p2.operations.PlannerResolutionJob.runModal(PlannerResolutionJob.java:76) at org.eclipse.equinox.p2.operations.ProfileChangeOperation.resolveModal(ProfileChangeOperation.java:115) at org.eclipse.equinox.internal.p2.ui.dialogs.ResolutionResultsWizardPage.<init>(ResolutionResultsWizardPage.java:57) at org.eclipse.equinox.internal.p2.ui.dialogs.SizeComputingWizardPage.<init>(SizeComputingWizardPage.java:43) at org.eclipse.equinox.internal.p2.ui.dialogs.InstallWizardPage.<init>(InstallWizardPage.java:21) at org.eclipse.equinox.internal.p2.ui.dialogs.PreselectedIUInstallWizard.createResolutionPage(PreselectedIUInstallWizard.java:49) at org.eclipse.equinox.internal.p2.ui.dialogs.ProvisioningOperationWizard.addPages(ProvisioningOperationWizard.java:75) at org.eclipse.equinox.internal.p2.ui.dialogs.WizardWithLicenses.addPages(WizardWithLicenses.java:34) at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:603) at org.eclipse.jface.window.Window.create(Window.java:431) at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089) at org.eclipse.m2e.internal.discovery.wizards.MavenDiscoveryUi.openInstallWizard(MavenDiscoveryUi.java:80) at org.eclipse.m2e.internal.discovery.MavenDiscoveryService.implement(MavenDiscoveryService.java:310) at org.eclipse.m2e.core.ui.internal.wizards.MavenImportWizard.performFinish(MavenImportWizard.java:150) at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:811) at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:430) at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3549) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3170) at org.eclipse.jface.window.Window.runEventLoop(Window.java:825) at org.eclipse.jface.window.Window.open(Window.java:801) at org.eclipse.ui.internal.handlers.WizardHandler$Import.executeHandler(WizardHandler.java:150) at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:277) at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169) at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241) at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157) at org.eclipse.ui.internal.actions.CommandAction.run(CommandAction.java:171) at org.eclipse.ui.actions.ImportResourcesAction.run(ImportResourcesAction.java:97) at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:168) 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:1258) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3549) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3170) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2697) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2661) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2495) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) 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:344) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
I believe the problem is that the p2 UI needs to resolve the job we give it, before it can open the wizard (otherwise it doesn't know which page to show initially). For a brand new workspace it must be much worse because the repositories aren't cached, and big repositories like Indigo or Helios are enabled. I'm not certain what we could do other than to resolve the job back in our wizard context again.
At very least we need to open a bug against p2 so that they manage ui thread properly
I've written a patch to fix this in p2, just testing and I will open a bug there and link it.
closing old/stale bugreports
Moved to https://github.com/eclipse-m2e/m2e-core/issues/
