Eclipse + Scala-IDE, DEADLOCK (FIXED, SORT OF)
February 22, 2011
FIXED IN http://download.scala-ide.org/nightly-update-wip-experiment-trunk (This is a nightly build, based on latest as 2011-02-22, Scala 2.9.)
Unfortunately, this version of the plugin takes 7 times longer (45-50 minutes) to perform a from-scratch project rebuild, and incremental changes are just as costly as clean rebuilds. This is clearly not usable. However, it is possible to use the new version, to clear the deadlocking state, and revert to 2.8.0, which can perform incremental rebuilds in a few seconds.
Sometimes, when I start Eclipse (Helios, M20100909-0800) with the Scala 2.8.0 Helios plugin, it never makes it past the splash screen, and CPU consumption falls to zero. Updating to the 2.8.1 version of the plugin is not an option (yet) because of this other bug. When (apparent) deadlock happens, jconsole can be very helpful in determining what’s really gloing on:
Which takes you here:
And lo:
Here’s the per-thread deadlock information from the pane in the lower right:
Name: org.eclipse.jdt.internal.ui.text.JavaReconciler State: BLOCKED on scala.tools.eclipse.javaelements.ScalaSourceFile@63273e5b owned by: org.eclipse.jdt.internal.ui.text.JavaReconciler Total blocked: 15 Total waited: 3 Stack trace: scala.tools.eclipse.javaelements.ScalaSourceFile.file(ScalaSourceFile.scala:79) scala.tools.eclipse.ScalaPresentationCompiler.discardCompilerResult(ScalaPresentationCompiler.scala:110) scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$discard$1.apply(ScalaCompilationUnit.scala:74) scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$discard$1.apply(ScalaCompilationUnit.scala:74) scala.tools.eclipse.util.Cached$$anonfun$apply$3.apply(Cached.scala:58) scala.tools.eclipse.util.Cached$class.locked(Cached.scala:83) scala.tools.eclipse.util.Cached$class.apply(Cached.scala:56) scala.tools.eclipse.ScalaProject$$anon$1.apply(ScalaProject.scala:40) scala.tools.eclipse.ScalaProject.withPresentationCompiler(ScalaProject.scala:362) scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.discard(ScalaCompilationUnit.scala:74) scala.tools.eclipse.javaelements.ScalaSourceFile.discard(ScalaSourceFile.scala:40) scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.close(ScalaCompilationUnit.scala:78) scala.tools.eclipse.javaelements.ScalaSourceFile.close(ScalaSourceFile.scala:40) org.eclipse.jdt.internal.core.JavaModelManager.closeChildren(JavaModelManager.java:3491) org.eclipse.jdt.internal.core.JavaModelManager.putInfos(JavaModelManager.java:3455) - locked org.eclipse.jdt.internal.core.JavaModelManager@406ea85e org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:529) org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:252) org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238) org.eclipse.jdt.internal.core.JavaElement.getChildren(JavaElement.java:193) scala.tools.eclipse.contribution.weaving.jdt.core.NameLookupAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_core_NameLookupAspect$1$1c7010b1(NameLookupAspect.aj:73) org.eclipse.jdt.internal.core.NameLookup.seekTypesInSourcePackage(NameLookup.java:1066) org.eclipse.jdt.internal.core.NameLookup.seekTypes(NameLookup.java:987) org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:776) org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:660) org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:619) org.eclipse.jdt.internal.core.SearchableEnvironment.find(SearchableEnvironment.java:101) org.eclipse.jdt.internal.core.SearchableEnvironment.findType(SearchableEnvironment.java:287) org.eclipse.jdt.internal.core.CancelableNameEnvironment.findType(CancelableNameEnvironment.java:45) org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:128) org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getType(PackageBinding.java:127) org.eclipse.jdt.internal.compiler.lookup.PackageBinding.isViewedAsDeprecated(PackageBinding.java:211) org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding.isViewedAsDeprecated(ReferenceBinding.java:1217) org.eclipse.jdt.internal.compiler.lookup.ClassScope.checkAndSetModifiers(ClassScope.java:420) org.eclipse.jdt.internal.compiler.lookup.ClassScope.buildType(ClassScope.java:376) org.eclipse.jdt.internal.compiler.lookup.ClassScope.buildMemberTypes(ClassScope.java:264) org.eclipse.jdt.internal.compiler.lookup.ClassScope.buildType(ClassScope.java:378) org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:144) org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:153) org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:717) org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:377) org.eclipse.jdt.internal.compiler.Compiler.resolve(Compiler.java:862) org.eclipse.jdt.internal.compiler.Compiler.resolve(Compiler.java:928) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody0(CompilationUnitProblemFinder.java:189) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody1$advice(CompilationUnitProblemFinder.java:246) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody2(CompilationUnitProblemFinder.java:1) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder$AjcClosure3.run(CompilationUnitProblemFinder.java:1) scala.tools.eclipse.contribution.weaving.jdt.core.CompilationUnitProblemFinderAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_core_CompilationUnitProblemFinderAspect$1$3edd546aproceed(CompilationUnitProblemFinderAspect.aj:1) scala.tools.eclipse.contribution.weaving.jdt.core.CompilationUnitProblemFinderAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_core_CompilationUnitProblemFinderAspect$1$3edd546a(CompilationUnitProblemFinderAspect.aj:49) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:156) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:255) org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:190) org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:89) org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728) org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:788) org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1244) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:126) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:108) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:89) org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:87) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.initialReconcile(JavaReconcilingStrategy.java:178) org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.initialReconcile(CompositeReconcilingStrategy.java:114) org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.initialReconcile(JavaCompositeReconcilingStrategy.java:133) org.eclipse.jface.text.reconciler.MonoReconciler.initialProcess(MonoReconciler.java:105) org.eclipse.jdt.internal.ui.text.JavaReconciler.initialProcess(JavaReconciler.java:398) - locked java.lang.Object@35fba309 org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:173)
Name: org.eclipse.jdt.internal.ui.text.JavaReconciler State: BLOCKED on org.eclipse.jdt.internal.core.JavaModelManager@406ea85e owned by: org.eclipse.jdt.internal.ui.text.JavaReconciler Total blocked: 28 Total waited: 1 Stack trace: org.eclipse.jdt.internal.core.JavaModelManager.getInfo(JavaModelManager.java:1913) org.eclipse.jdt.internal.core.Openable.exists(Openable.java:183) org.eclipse.jdt.internal.core.PackageFragmentRoot.getUnderlyingResource(PackageFragmentRoot.java:694) org.eclipse.jdt.internal.core.PackageFragment.getUnderlyingResource(PackageFragment.java:337) org.eclipse.jdt.internal.core.Openable.getUnderlyingResource(Openable.java:334) org.eclipse.jdt.internal.core.CompilationUnit.getUnderlyingResource(CompilationUnit.java:930) org.eclipse.jdt.internal.core.CompilationUnit.getCorrespondingResource(CompilationUnit.java:693) scala.tools.eclipse.javaelements.ScalaSourceFile.liftedTree1$1(ScalaSourceFile.scala:80) scala.tools.eclipse.javaelements.ScalaSourceFile.file(ScalaSourceFile.scala:80) - locked scala.tools.eclipse.javaelements.ScalaSourceFile@63273e5b scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anon$1.create(ScalaCompilationUnit.scala:49) scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anon$1.create(ScalaCompilationUnit.scala:35) scala.tools.eclipse.util.Cached$class.apply(Cached.scala:44) scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anon$1.apply(ScalaCompilationUnit.scala:35) scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.withCompilerResult(ScalaCompilationUnit.scala:58) scala.tools.eclipse.javaelements.ScalaSourceFile.withCompilerResult(ScalaSourceFile.scala:40) scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.buildStructure(ScalaCompilationUnit.scala:87) scala.tools.eclipse.javaelements.ScalaSourceFile.buildStructure(ScalaSourceFile.scala:40) org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:258) org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:515) org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:252) org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238) org.eclipse.jdt.internal.core.JavaElement.getChildren(JavaElement.java:193) scala.tools.eclipse.javaelements.ScalaSourceFile.getCorrespondingElement(ScalaSourceFile.scala:96) scala.tools.eclipse.javaelements.ScalaSourceFile.getType(ScalaSourceFile.scala:102) scala.tools.eclipse.contribution.weaving.jdt.core.NameLookupAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_core_NameLookupAspect$1$1c7010b1(NameLookupAspect.aj:83) org.eclipse.jdt.internal.core.NameLookup.seekTypesInSourcePackage(NameLookup.java:1066) org.eclipse.jdt.internal.core.NameLookup.seekTypes(NameLookup.java:987) org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:776) org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:660) org.eclipse.jdt.internal.core.NameLookup.findType(NameLookup.java:619) org.eclipse.jdt.internal.core.SearchableEnvironment.find(SearchableEnvironment.java:101) org.eclipse.jdt.internal.core.SearchableEnvironment.findType(SearchableEnvironment.java:287) org.eclipse.jdt.internal.core.CancelableNameEnvironment.findType(CancelableNameEnvironment.java:45) org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:128) org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:183) org.eclipse.jdt.internal.compiler.lookup.Scope.getTypeOrPackage(Scope.java:2613) org.eclipse.jdt.internal.compiler.lookup.Scope.getType(Scope.java:2330) org.eclipse.jdt.internal.compiler.ast.SingleTypeReference.getTypeBinding(SingleTypeReference.java:44) org.eclipse.jdt.internal.compiler.ast.TypeReference.internalResolveType(TypeReference.java:131) org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveType(TypeReference.java:207) org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveSuperType(TypeReference.java:185) org.eclipse.jdt.internal.compiler.lookup.ClassScope.findSupertype(ClassScope.java:1194) org.eclipse.jdt.internal.compiler.lookup.ClassScope.connectSuperclass(ClassScope.java:888) org.eclipse.jdt.internal.compiler.lookup.ClassScope.connectTypeHierarchy(ClassScope.java:1031) org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.connectTypeHierarchy(CompilationUnitScope.java:299) org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:191) org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:735) org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:377) org.eclipse.jdt.internal.compiler.Compiler.resolve(Compiler.java:862) org.eclipse.jdt.internal.compiler.Compiler.resolve(Compiler.java:928) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody0(CompilationUnitProblemFinder.java:189) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody1$advice(CompilationUnitProblemFinder.java:246) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody2(CompilationUnitProblemFinder.java:1) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder$AjcClosure3.run(CompilationUnitProblemFinder.java:1) scala.tools.eclipse.contribution.weaving.jdt.core.CompilationUnitProblemFinderAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_core_CompilationUnitProblemFinderAspect$1$3edd546aproceed(CompilationUnitProblemFinderAspect.aj:1) scala.tools.eclipse.contribution.weaving.jdt.core.CompilationUnitProblemFinderAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_core_CompilationUnitProblemFinderAspect$1$3edd546a(CompilationUnitProblemFinderAspect.aj:49) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:156) org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:255) org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:190) org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:89) org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728) org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:788) org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1244) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:126) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:108) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:89) org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:87) org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.initialReconcile(JavaReconcilingStrategy.java:178) org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.initialReconcile(CompositeReconcilingStrategy.java:114) org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.initialReconcile(JavaCompositeReconcilingStrategy.java:133) org.eclipse.jface.text.reconciler.MonoReconciler.initialProcess(MonoReconciler.java:105) org.eclipse.jdt.internal.ui.text.JavaReconciler.initialProcess(JavaReconciler.java:398) - locked java.lang.Object@1b8cbf8f org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:173)
More gory details from jconsole:
VM Summary Tuesday, February 22, 2011 11:31:27 AM EST Connection name: pid: 6414 Virtual Machine: Java HotSpot(TM) 64-Bit Server VM version 17.1-b03-307 Vendor: Apple Inc. Name: 6414@dr2chase.local Uptime: 23 minutes Process CPU time: 47.050 seconds JIT compiler: HotSpot 64-Bit Server Compiler Total compile time: 29.825 seconds Live threads: 26 Peak: 27 Daemon threads: 21 Total threads started: 30 Current classes loaded: 9,595 Total classes loaded: 9,595 Total classes unloaded: 0 Current heap size: 231,549 kbytes Maximum heap size: 2,066,432 kbytes Committed memory: 686,080 kbytes Pending finalization: 0 objects Garbage collector: Name = 'ParNew', Collections = 8, Total time spent = 1.255 seconds Garbage collector: Name = 'ConcurrentMarkSweep', Collections = 3, Total time spent = 1.425 seconds Operating System: Mac OS X 10.6.6 Architecture: x86_64 Number of processors: 2 Committed virtual memory: 5,644,460 kbytes Total physical memory: 6,291,456 kbytes Free physical memory: 291,928 kbytes Total swap space: 2,097,152 kbytes Free swap space: 944,032 kbytes VM arguments: -Xss8m -Xms700m -Xmx2048m -XX:NewSize=300m -server -XX:+DoEscapeAnalysis -XX:+UseConcMarkSweepGC -Xdock:icon=../Resources/Eclipse.icns -XstartOnFirstThread -Dorg.eclipse.swt.internal.carbon.smallFonts -XX:MaxPermSize=256m Class path: /Applications/eclipse-3.6.1/Eclipse.app/Contents/MacOS/../../../plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar Library path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java Boot class path: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsfd.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/classes.jar:/System/Library/Frameworks/JavaVM.framework/Frameworks/JavaRuntimeSupport.framework/Resources/Java/JavaRuntimeSupport.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/ui.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/laf.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/sunrsasign.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jsse.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/jce.jar:/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Classes/charsets.jar
