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Happened to me today as I wanted to start working: Java Model Exception: java.lang.NullPointerException at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:247) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:269) at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:190) at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:89) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:788) at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1247) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:126) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:108) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:89) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:87) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.initialReconcile(JavaReconcilingStrategy.java:178) at org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.initialReconcile(CompositeReconcilingStrategy.java:114) at org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.initialReconcile(JavaCompositeReconcilingStrategy.java:136) at org.eclipse.jface.text.reconciler.MonoReconciler.initialProcess(MonoReconciler.java:105) at org.eclipse.jdt.internal.ui.text.JavaReconciler.initialProcess(JavaReconciler.java:406) at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:173) Caused by: java.lang.NullPointerException at org.eclipse.core.internal.preferences.EclipsePreferences.removePreferenceChangeListener(EclipsePreferences.java:1089) at org.eclipse.jdt.internal.core.JavaProject.getEclipsePreferences(JavaProject.java:1514) at org.eclipse.jdt.internal.core.JavaProject.getOption(JavaProject.java:1655) at org.eclipse.jdt.internal.core.PackageFragmentRoot.computeFolderChildren(PackageFragmentRoot.java:229) at org.eclipse.jdt.internal.core.PackageFragmentRoot.computeChildren(PackageFragmentRoot.java:197) at org.eclipse.jdt.internal.core.JavaProjectElementInfo.initializePackageNames(JavaProjectElementInfo.java:252) at org.eclipse.jdt.internal.core.JavaProjectElementInfo.getProjectCache(JavaProjectElementInfo.java:225) at org.eclipse.jdt.internal.core.JavaProject.getProjectCache(JavaProject.java:1922) at org.eclipse.jdt.internal.core.JavaProjectElementInfo.newNameLookup(JavaProjectElementInfo.java:309) at org.eclipse.jdt.internal.core.JavaProject.newNameLookup(JavaProject.java:2327) at org.eclipse.jdt.internal.core.SearchableEnvironment.<init>(SearchableEnvironment.java:59) at org.eclipse.jdt.internal.core.SearchableEnvironment.<init>(SearchableEnvironment.java:66) at org.eclipse.jdt.internal.core.CancelableNameEnvironment.<init>(CancelableNameEnvironment.java:26) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:176) ... 17 more Caused by: java.lang.NullPointerException at org.eclipse.core.internal.preferences.EclipsePreferences.removePreferenceChangeListener(EclipsePreferences.java:1089) at org.eclipse.jdt.internal.core.JavaProject.getEclipsePreferences(JavaProject.java:1514) at org.eclipse.jdt.internal.core.JavaProject.getOption(JavaProject.java:1655) at org.eclipse.jdt.internal.core.PackageFragmentRoot.computeFolderChildren(PackageFragmentRoot.java:229) at org.eclipse.jdt.internal.core.PackageFragmentRoot.computeChildren(PackageFragmentRoot.java:197) at org.eclipse.jdt.internal.core.JavaProjectElementInfo.initializePackageNames(JavaProjectElementInfo.java:252) at org.eclipse.jdt.internal.core.JavaProjectElementInfo.getProjectCache(JavaProjectElementInfo.java:225) at org.eclipse.jdt.internal.core.JavaProject.getProjectCache(JavaProject.java:1922) at org.eclipse.jdt.internal.core.JavaProjectElementInfo.newNameLookup(JavaProjectElementInfo.java:309) at org.eclipse.jdt.internal.core.JavaProject.newNameLookup(JavaProject.java:2327) at org.eclipse.jdt.internal.core.SearchableEnvironment.<init>(SearchableEnvironment.java:59) at org.eclipse.jdt.internal.core.SearchableEnvironment.<init>(SearchableEnvironment.java:66) at org.eclipse.jdt.internal.core.CancelableNameEnvironment.<init>(CancelableNameEnvironment.java:26) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:176) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:269) at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.makeConsistent(ReconcileWorkingCopyOperation.java:190) at org.eclipse.jdt.internal.core.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:89) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:788) at org.eclipse.jdt.internal.core.CompilationUnit.reconcile(CompilationUnit.java:1247) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:126) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.access$0(JavaReconcilingStrategy.java:108) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy$1.run(JavaReconcilingStrategy.java:89) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.reconcile(JavaReconcilingStrategy.java:87) at org.eclipse.jdt.internal.ui.text.java.JavaReconcilingStrategy.initialReconcile(JavaReconcilingStrategy.java:178) at org.eclipse.jdt.internal.ui.text.CompositeReconcilingStrategy.initialReconcile(CompositeReconcilingStrategy.java:114) at org.eclipse.jdt.internal.ui.text.JavaCompositeReconcilingStrategy.initialReconcile(JavaCompositeReconcilingStrategy.java:136) at org.eclipse.jface.text.reconciler.MonoReconciler.initialProcess(MonoReconciler.java:105) at org.eclipse.jdt.internal.ui.text.JavaReconciler.initialProcess(JavaReconciler.java:406) at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:173)
Alex what version are you using? Is the issue reproducible?
v 3.8.1.v20120531-0637, issue not reproducible.
Saw it on a 3rd-party product that updates classpath containers from a background job. JDT: 3.13.10.v20171130-0906 Platform: 4.7.2.v20171130-0906 !ENTRY org.eclipse.core.jobs 4 0 2019-08-02 16:02:31.012 !MESSAGE Artifact resolver !SUBENTRY 1 org.eclipse.core.jobs 4 2 2019-08-02 16:02:31.012 !MESSAGE An internal error occurred during: "Downloading eai-bpcs-filetransfer-system project dependencies: com.andersen.eai:eai-core-error-handling-lib:2.1.0-SNAPSHOT". !STACK 0 java.lang.NullPointerException at org.eclipse.core.internal.preferences.EclipsePreferences.removePreferenceChangeListener(EclipsePreferences.java:1037) at org.eclipse.jdt.internal.core.JavaProject.getEclipsePreferences(JavaProject.java:1787) at org.eclipse.jdt.internal.core.JavaProject.getOption(JavaProject.java:1941) at org.eclipse.jdt.internal.core.ClasspathEntry.validateLibraryEntry(ClasspathEntry.java:2295) at org.eclipse.jdt.internal.core.ClasspathEntry.validateClasspathEntry(ClasspathEntry.java:2214) at org.eclipse.jdt.internal.core.ClasspathEntry.validateClasspathEntry(ClasspathEntry.java:2155) at org.eclipse.jdt.internal.core.ClasspathEntry.validateClasspathEntry(ClasspathEntry.java:2085) at org.eclipse.jdt.internal.core.ClasspathValidation.validate(ClasspathValidation.java:72) at org.eclipse.jdt.internal.core.ChangeClasspathOperation.classpathChanged(ChangeClasspathOperation.java:51) at org.eclipse.jdt.internal.core.SetContainerOperation.executeOperation(SetContainerOperation.java:111) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:724) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2267) at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:795) at org.eclipse.jdt.core.JavaCore.setClasspathContainer(JavaCore.java:5730) ...
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
