STS 3.1.0 and Grails 2.1.1 Exception jline_.dll already loaded in another classloade​r

I set up a new Grails project in STS 3.1.0 and I always got the below exception when I tried to edit a file. Sometimes it works (after I closed STS and restart) sometimes not.

I never found the displayed folder! C:\Users\hhb\AppData\Local\Temp\jline_.dll already loaded in another classloader.

Before, I converted 2 projects to STS 3.1.0 and Grails 2.1.1 from earliers releases and I had no issues with this projects.

The cause of this exception was, that I copied outside of STS from the file system some Groovy classes to the new project which had no or wrong package names. This needed to be fixed outside of STS.

java.lang.UnsatisfiedLinkError: Native Library C:\Users\hhb\AppData\Local\Temp\jline_.dll already loaded in another classloader at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1768) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1699) at java.lang.Runtime.load0(Runtime.java:770) at java.lang.System.load(System.java:1003) at jline.WindowsTerminal.loadLibrary(WindowsTerminal.java:322) at jline.WindowsTerminal.initializeTerminal(WindowsTerminal.java:240) at jline.Terminal.setupTerminal(Terminal.java:75) at jline.Terminal.getTerminal(Terminal.java:26) at jline.ConsoleReader.(ConsoleReader.java:174) at jline.ConsoleReader.(ConsoleReader.java:169) at grails.build.logging.GrailsConsole.createConsoleReader(GrailsConsole.java:169) at grails.build.logging.GrailsConsole.(GrailsConsole.java:133) at grails.build.logging.GrailsConsole.createInstance(GrailsConsole.java:268) at grails.build.logging.GrailsConsole.getInstance(GrailsConsole.java:245) at org.codehaus.groovy.grails.cli.logging.GrailsConsoleErrorPrintStream.println(GrailsConsoleErrorPrintStream.java:59) at org.codehaus.jdt.groovy.internal.compiler.ast.GroovyErrorCollectorForJDT.addErrorAndContinue(GroovyErrorCollectorForJDT.java:34) at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:107) at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:126) at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:135) at org.codehaus.groovy.control.SourceUnit.addError(SourceUnit.java:392) at org.codehaus.groovy.antlr.ErrorRecoveredCSTParserPlugin.reportCST(ErrorRecoveredCSTParserPlugin.java:156) at org.codehaus.groovy.antlr.ErrorRecoveredCSTParserPlugin.transformCSTIntoAST(ErrorRecoveredCSTParserPlugin.java:128) at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:115) at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:264) at org.codehaus.groovy.control.CompilationUnit$8.call(CompilationUnit.java:186) at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:940) at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:612) at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:588) at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:565) at org.codehaus.jdt.groovy.internal.compiler.ast.GroovyCompilationUnitDeclaration.processToPhase(GroovyCompilationUnitDeclaration.java:171) at org.codehaus.jdt.groovy.internal.compiler.ast.GroovyParser.dietParse(GroovyParser.java:455) at org.codehaus.jdt.groovy.integration.internal.MultiplexingSourceElementRequestorParser.parseCompilationUnit(MultiplexingSourceElementRequestorParser.java:73) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody0(CompilationUnitProblemFinder.java:200) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process_aroundBody1$advice(CompilationUnitProblemFinder.java:244) at org.eclipse.jdt.internal.core.CompilationUnitProblemFinder.process(CompilationUnitProblemFinder.java:1) at org.codehaus.jdt.groovy.model.GroovyCompilationUnit.buildStructure(GroovyCompilationUnit.java:319) at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:258) at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:526) at org.eclipse.jdt.internal.core.BecomeWorkingCopyOperation.executeOperation(BecomeWorkingCopyOperation.java:38) 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.becomeWorkingCopy(CompilationUnit.java:102) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.createFileInfo(CompilationUnitDocumentProvider.java:999) at org.eclipse.ui.editors.text.TextFileDocumentProvider.connect(TextFileDocumentProvider.java:478) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitDocumentProvider.connect(CompilationUnitDocumentProvider.java:1242) at org.eclipse.ui.texteditor.AbstractTextEditor.doSetInput(AbstractTextEditor.java:4222) at org.eclipse.ui.texteditor.StatusTextEditor.doSetInput(StatusTextEditor.java:237) at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.doSetInput(AbstractDecoratedTextEditor.java:1480) at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.internalDoSetInput(JavaEditor.java:2584) at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor.doSetInput(JavaEditor.java:2557) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.doSetInput(CompilationUnitEditor.java:1395) at org.codehaus.groovy.eclipse.editor.GroovyEditor.doSetInput(GroovyEditor.java:1019) at org.eclipse.ui.texteditor.AbstractTextEditor$19.run(AbstractTextEditor.java:3209) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372) at org.eclipse.ui.internal.WorkbenchWindow$13.run(WorkbenchWindow.java:1675) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:1672) at org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3227) at org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3254) at org.eclipse.ui.internal.EditorReference.initialize(EditorReference.java:324) at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create(CompatibilityPart.java:288) 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.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56) at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:859) at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:839) at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:111) at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:319) at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:240) at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:161) at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:102) at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:71) at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:53) at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer.createWidget(ContributedPartRenderer.java:141) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:896) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:630) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:732) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:703) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:697) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:682) at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:1114) at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:67) at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:41) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4687) at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:187) at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38) at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1) at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230) at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148) at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135) at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78) at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39) at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:81) at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374) at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:171) at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.showElementInWindow(ModelServiceImpl.java:418) at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.bringToTop(ModelServiceImpl.java:385) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.delegateBringToTop(PartServiceImpl.java:579) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.bringToTop(PartServiceImpl.java:315) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:985) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3079) at org.eclipse.ui.internal.WorkbenchPage.access$22(WorkbenchPage.java:3003) at org.eclipse.ui.internal.WorkbenchPage$8.run(WorkbenchPage.java:2985) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2981) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2940) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2931) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:373) at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:179) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:249) at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:228) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:275) at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:251) at org.eclipse.jdt.internal.ui.navigator.OpenAndExpand.run(OpenAndExpand.java:50) at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:221) at org.eclipse.ui.navigator.CommonNavigatorManager$3.open(CommonNavigatorManager.java:185) at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48) at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864) at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152) at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:462) at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256) at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275) at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1029) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:923) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) 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:353) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) 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:629) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) at org.eclipse.equinox.launcher.Main.run(Main.java:1438)