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opening and working of groovy projects work, but it seems that 1 CPU is constantly occupied just scanning the grrovy projects - and when it reaches 100%, it just starts over It seems there is a thread always busy somewhere above GroovyParser.parse Three examples 1. "RepositoryUpdater.worker" #26 daemon prio=1 os_prio=31 tid=0x00007fe0c2779800 nid=0x10703 runnable [0x0000000166693000] java.lang.Thread.State: RUNNABLE at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getFileObject(FileObjectFactory.java:231) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getValidFileObject(FileObjectFactory.java:793) at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.getFileObject(FolderObj.java:136) at org.netbeans.api.java.classpath.ClassPath.findPath(ClassPath.java:1128) at org.netbeans.api.java.classpath.ClassPath.findResourceImpl(ClassPath.java:1155) at org.netbeans.api.java.classpath.ClassPath.findResource(ClassPath.java:468) at org.netbeans.modules.groovy.editor.compiler.ClassNodeCache$ParsingClassLoader.getSourceFile(ClassNodeCache.java:377) at org.netbeans.modules.groovy.editor.compiler.ClassNodeCache$ParsingClassLoader.access$200(ClassNodeCache.java:319) at org.netbeans.modules.groovy.editor.compiler.ClassNodeCache$ParsingClassLoader$1$1.run(ClassNodeCache.java:337) at java.security.AccessController.doPrivileged(Native Method) at org.netbeans.modules.groovy.editor.compiler.ClassNodeCache$ParsingClassLoader$1.loadGroovySource(ClassNodeCache.java:333) at org.codehaus.groovy.control.ClassNodeResolver.tryAsScript(ClassNodeResolver.java:229) at org.codehaus.groovy.control.ClassNodeResolver.tryAsLoaderClassOrScript(ClassNodeResolver.java:185) at org.codehaus.groovy.control.ClassNodeResolver.findClassNode(ClassNodeResolver.java:168) at org.codehaus.groovy.control.ClassNodeResolver.resolveName(ClassNodeResolver.java:124) at org.codehaus.groovy.control.ResolveVisitor.resolveToOuter(ResolveVisitor.java:616) at org.codehaus.groovy.control.ResolveVisitor.resolve(ResolveVisitor.java:268) at org.codehaus.groovy.control.ResolveVisitor.resolveFromModule(ResolveVisitor.java:550) at org.codehaus.groovy.control.ResolveVisitor.resolve(ResolveVisitor.java:268) at org.codehaus.groovy.control.ResolveVisitor.visitClass(ResolveVisitor.java:1163) at org.codehaus.groovy.control.ResolveVisitor.startResolving(ResolveVisitor.java:141) at org.codehaus.groovy.control.CompilationUnit$10.call(CompilationUnit.java:632) at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:912) at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:574) at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:523) at org.netbeans.modules.groovy.editor.api.parser.GroovyParser.parseBuffer(GroovyParser.java:477) at org.netbeans.modules.groovy.editor.api.parser.GroovyParser.parse(GroovyParser.java:157) 2. "RepositoryUpdater.worker" #26 daemon prio=1 os_prio=31 tid=0x00007fe0c2779800 nid=0x10703 runnable [0x0000000166694000] java.lang.Thread.State: RUNNABLE at java.net.URI$Parser.scan(URI.java:2998) at java.net.URI$Parser.checkChars(URI.java:3019) at java.net.URI$Parser.parse(URI.java:3058) at java.net.URI.<init>(URI.java:588) at java.net.URL.toURI(URL.java:939) at org.netbeans.api.java.source.ClasspathInfo.toURIs(ClasspathInfo.java:426) at org.netbeans.api.java.source.ClasspathInfo.equals(ClasspathInfo.java:217) at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:459) at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:162) at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:631) at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:378) at org.netbeans.modules.parsing.api.ParserManager$MimeTaskAction.run(ParserManager.java:363) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360) at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88) at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201) at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:334) at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:415) at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:407) at org.netbeans.modules.groovy.editor.compiler.CompilationUnit$CompileUnit.getClass(CompilationUnit.java:156) at org.codehaus.groovy.control.ResolveVisitor.resolveFromCompileUnit(ResolveVisitor.java:417) at org.codehaus.groovy.control.ResolveVisitor.resolve(ResolveVisitor.java:268) at org.codehaus.groovy.control.ResolveVisitor.visitClass(ResolveVisitor.java:1140) at org.codehaus.groovy.control.ResolveVisitor.startResolving(ResolveVisitor.java:141) at org.codehaus.groovy.control.CompilationUnit$10.call(CompilationUnit.java:632) at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:912) at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:574) at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:523) at org.netbeans.modules.groovy.editor.api.parser.GroovyParser.parseBuffer(GroovyParser.java:477) at org.netbeans.modules.groovy.editor.api.parser.GroovyParser.parse(GroovyParser.java:157) 3. "RepositoryUpdater.worker" #26 daemon prio=1 os_prio=31 tid=0x00007fe0c2779800 nid=0x10703 runnable [0x0000000166691000] java.lang.Thread.State: RUNNABLE at java.lang.Throwable.fillInStackTrace(Native Method) at java.lang.Throwable.fillInStackTrace(Throwable.java:783) - locked <0x00000007abe2c188> (a java.io.FileNotFoundException) at java.lang.Throwable.<init>(Throwable.java:265) at java.lang.Exception.<init>(Exception.java:66) at java.io.IOException.<init>(IOException.java:58) at java.io.FileNotFoundException.<init>(FileNotFoundException.java:64) at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:142) at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:150) at sun.misc.URLClassPath$Loader.getResource(URLClassPath.java:702) at sun.misc.URLClassPath.getResource(URLClassPath.java:212) at java.net.URLClassLoader$1.run(URLClassLoader.java:365) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) - locked <0x00000007aae30ba8> (a org.netbeans.modules.groovy.editor.compiler.ClassNodeCache$TransformationClassLoader) at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:648) at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:758) at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:746) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:760) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:368) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) - locked <0x00000007aae30ba8> (a org.netbeans.modules.groovy.editor.compiler.ClassNodeCache$TransformationClassLoader) at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:648) at org.codehaus.groovy.transform.ASTTransformationVisitor.addPhaseOperationsForGlobalTransforms(ASTTransformationVisitor.java:299) at org.codehaus.groovy.transform.ASTTransformationVisitor.doAddGlobalTransforms(ASTTransformationVisitor.java:280) at org.codehaus.groovy.transform.ASTTransformationVisitor.addGlobalTransforms(ASTTransformationVisitor.java:190) at org.codehaus.groovy.transform.ASTTransformationVisitor.addPhaseOperations(ASTTransformationVisitor.java:154) at org.codehaus.groovy.control.CompilationUnit.<init>(CompilationUnit.java:195) at org.netbeans.modules.groovy.editor.compiler.CompilationUnit.<init>(CompilationUnit.java:89) at org.netbeans.modules.groovy.editor.api.parser.GroovyParser.parseBuffer(GroovyParser.java:460) at org.netbeans.modules.groovy.editor.api.parser.GroovyParser.parse(GroovyParser.java:157) I did not observer the same problem in nightly 201605100002 (but that one crashes on me almost instantly when I start typing, so can't use it either) There was stuff like this around #175320 but that should not be happening with NB 8.1 with latest groovy and gradle plugins, right ?