Environment:

• Eclipse Luna SR2 (4.4.2)
• Groovy Eclipse 2.9.2
• Groovy compiler level: 2.0.7
• Java / groovy save actions enabled

Description:
Working on groovy source files within a maven project with the groovy compiler level set to 2.0.7, every time I save the 'Save problems' dialog appears with the following details:

A save participant caused problems.
The save participant 'Code Clean Up' caused an exception: java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.eclipse.refactoring.actions.TypeSearch. See the error log for details.

and the normal save actions (tidy imports, remove semi-colons etc) are not executed. When the groovy compiler level is set to 2.3.10 the problem does not occur.

The log has the following stack trace info whenever this problem occurs:

!ENTRY org.eclipse.jdt.ui 4 10006 2015-07-15 13:31:02.111
!MESSAGE The save participant 'org.eclipse.jdt.ui.postsavelistener.cleanup' caused an exception: java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.eclipse.refactoring.actions.TypeSearch
!STACK 0
java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.eclipse.refactoring.actions.TypeSearch
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports.resolveMissingTypes(OrganizeGroovyImports.java:648)
at org.codehaus.groovy.eclipse.refactoring.actions.OrganizeGroovyImports.calculateMissingImports(OrganizeGroovyImports.java:462)
at org.codehaus.groovy.eclipse.refactoring.actions.GroovyImportsCleanUp.createFix(GroovyImportsCleanUp.java:58)
at org.eclipse.jdt.internal.corext.fix.CleanUpRefactoring.calculateChange(CleanUpRefactoring.java:809)
at org.codehaus.groovy.eclipse.refactoring.actions.CleanUpPostSaveListener.saved(CleanUpPostSaveListener.java:354)
at org.codehaus.groovy.eclipse.refactoring.actions.DelegatingCleanUpPostSaveListener.saved(DelegatingCleanUpPostSaveListener.java:120)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider$5.run(CompilationUnitDocumentProvider.java:1598)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.notifyPostSaveListeners(CompilationUnitDocumentProvider.java:1593)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.commitWorkingCopy(CompilationUnitDocumentProvider.java:1380)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider$4.execute(CompilationUnitDocumentProvider.java:1458)
at org.eclipse.ui.editors.text.TextFileDocumentProvider$DocumentProviderOperation.run(TextFileDocumentProvider.java:132)
at org.eclipse.ui.actions.WorkspaceModifyDelegatingOperation.execute(WorkspaceModifyDelegatingOperation.java:69)
at org.eclipse.ui.actions.WorkspaceModifyOperation$1.run(WorkspaceModifyOperation.java:106)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313)
at org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:118)
at org.eclipse.ui.internal.editors.text.WorkspaceOperationRunner.run(WorkspaceOperationRunner.java:75)
at org.eclipse.ui.internal.editors.text.WorkspaceOperationRunner.run(WorkspaceOperationRunner.java:65)
at org.eclipse.ui.editors.text.TextFileDocumentProvider.executeOperation(TextFileDocumentProvider.java:456)
at org.eclipse.ui.editors.text.TextFileDocumentProvider.saveDocument(TextFileDocumentProvider.java:772)
at org.eclipse.ui.texteditor.AbstractTextEditor.performSave(AbstractTextEditor.java:5076)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.performSave(CompilationUnitEditor.java:1247)
at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSave(CompilationUnitEditor.java:1301)
at org.eclipse.ui.texteditor.AbstractTextEditor$TextEditorSavable.doSave(AbstractTextEditor.java:7209)
at org.eclipse.ui.Saveable.doSave(Saveable.java:216)
at org.eclipse.ui.internal.SaveableHelper.doSaveModel(SaveableHelper.java:355)
at org.eclipse.ui.internal.SaveableHelper$3.run(SaveableHelper.java:199)
at org.eclipse.ui.internal.SaveableHelper$5.run(SaveableHelper.java:283)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:466)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:374)
at org.eclipse.ui.internal.WorkbenchWindow$13.run(WorkbenchWindow.java:2157)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2153)
at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:291)
at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:269)
at org.eclipse.ui.internal.SaveableHelper.saveModels(SaveableHelper.java:211)
at org.eclipse.ui.internal.SaveableHelper.savePart(SaveableHelper.java:146)
at org.eclipse.ui.internal.WorkbenchPage.saveSaveable(WorkbenchPage.java:3915)
at org.eclipse.ui.internal.WorkbenchPage.saveEditor(WorkbenchPage.java:3929)
at org.eclipse.ui.internal.handlers.SaveHandler.execute(SaveHandler.java:54)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:294)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
at sun.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:247)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:229)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:149)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:499)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:286)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:507)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:558)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:378)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.access$0(KeyBindingDispatcher.java:324)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:86)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1060)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1070)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1112)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1108)
at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1529)
at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4722)
at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:343)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4610)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5023)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2549)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)