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In M4, I get an internal error. Nothing helps (refresh, change code). When I replace jdtcore.jar with the one from M3, it works again. (When I installed M4, I copied my whole workspace from M3 to M4. Hope this isn't the cause.) Stack trace: java.lang.NullPointerException at org.eclipse.jdt.internal.compiler.ClassFile.addFieldInfo(ClassFile.java:434) at org.eclipse.jdt.internal.compiler.ClassFile.addFieldInfos(ClassFile.java:579) at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.generateCode(TypeDeclaration.java:694) at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.generateCode(TypeDeclaration.java:762) at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.generateCode(TypeDeclaration.java:709) at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.generateCode(TypeDeclaration.java:770) at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.generateCode(CompilationUnitDeclaration.java:158) at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:543) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:337) at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:194) at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:144) at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.build(BatchImageBuilder.java:49) at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildAll(JavaBuilder.java:179) at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:102) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:384) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:852) at org.eclipse.core.runtime.Platform.run(Platform.java:413) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:120) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:176) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:186) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:146) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:852) at org.eclipse.core.runtime.Platform.run(Platform.java:413) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:160) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:232) at org.eclipse.core.internal.resources.Project.build(Project.java:87) at org.eclipse.jdt.internal.launching.LaunchingPlugin$1.run(LaunchingPlugin.java:556) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1564) at org.eclipse.jdt.internal.launching.LaunchingPlugin.buildProjects(LaunchingPlugin.java:575) at org.eclipse.jdt.internal.launching.LaunchingPlugin.processVMAddsChangesDeletes(LaunchingPlugin.java:468) at org.eclipse.jdt.internal.launching.LaunchingPlugin.processVMPrefsChanged(LaunchingPlugin.java:361) at org.eclipse.jdt.internal.launching.LaunchingPlugin.propertyChange(LaunchingPlugin.java:271) at org.eclipse.core.runtime.Preferences.firePropertyChangeEvent(Preferences.java:578) at org.eclipse.core.runtime.Preferences.setValue(Preferences.java:1181) at org.eclipse.jdt.internal.debug.ui.launcher.VMPreferencePage.performOk(VMPreferencePage.java:422) at org.eclipse.jface.preference.PreferenceDialog.okPressed(PreferenceDialog.java:616) at org.eclipse.jface.preference.PreferenceDialog.buttonPressed(PreferenceDialog.java:185) at org.eclipse.ui.internal.dialogs.WorkbenchPreferenceDialog.buttonPressed(WorkbenchPreferenceDialog.java:103) at org.eclipse.jface.dialogs.Dialog$1.widgetSelected(Dialog.java:398) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:87) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:77) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:825) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:1692) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1410) at org.eclipse.jface.window.Window.runEventLoop(Window.java:561) at org.eclipse.jface.window.Window.open(Window.java:541) at org.eclipse.ui.internal.OpenPreferencesAction.run(OpenPreferencesAction.java:47) at org.eclipse.jface.action.Action.runWithEvent(Action.java:769) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:411) at org.eclipse.jface.action.ActionContributionItem.handleWidgetEvent(ActionContributionItem.java:365) at org.eclipse.jface.action.ActionContributionItem.access$0(ActionContributionItem.java:356) at org.eclipse.jface.action.ActionContributionItem$ActionListener.handleEvent(ActionContributionItem.java:48) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:77) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:825) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:1692) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1410) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1446) at org.eclipse.ui.internal.Workbench.run(Workbench.java:1429) at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:845) at org.eclipse.core.boot.BootLoader.run(BootLoader.java:462) 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:324) at org.eclipse.core.launcher.Main.basicRun(Main.java:247) at org.eclipse.core.launcher.Main.run(Main.java:703) at org.eclipse.core.launcher.Main.main(Main.java:539)
*** This bug has been marked as a duplicate of 28750 ***