java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
        at java.util.HashMap$EntryIterator.next(HashMap.java:883)
        at java.util.HashMap$EntryIterator.next(HashMap.java:881)
        at org.netbeans.core.startup.NbInstaller.shouldDelegateClasspathResource(NbInstaller.java:842)
        at org.netbeans.ModuleManager$SystemClassLoader.shouldDelegateResource(ModuleManager.java:470)
        at org.netbeans.ProxyClassLoader.getResource(ProxyClassLoader.java:350)
        at org.openide.util.NbBundle.loadBundle(NbBundle.java:545)
        at org.openide.util.NbBundle.getBundleFast(NbBundle.java:509)
        at org.openide.util.NbBundle.getBundle(NbBundle.java:435)
        at org.openide.util.NbBundle.getBundle(NbBundle.java:373)
        at org.netbeans.core.startup.layers.SystemFileSystem.annotateName(SystemFileSystem.java:201)
        at org.netbeans.core.startup.layers.SystemFileSystem.annotateName(SystemFileSystem.java:228)
        at org.openide.loaders.DataNode.getDisplayName(DataNode.java:190)
        at java.beans.FeatureDescriptor.getShortDescription(FeatureDescriptor.java:145)
        at org.openide.nodes.Node.setShortDescription(Node.java:410)
        at org.openide.nodes.FilterNode.setShortDescription(FilterNode.java:542)
        at org.openide.loaders.XMLDataObject.createNodeDelegate(XMLDataObject.java:255)
        at org.openide.loaders.DataObject$1.run(DataObject.java:285)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.util.Mutex$1R.run(Mutex.java:1301)
        at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1810)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1320)
        at org.openide.util.Mutex.readAccess(Mutex.java:351)
        at org.openide.loaders.DataObject.getNodeDelegateImpl(DataObject.java:281)
        at org.openide.loaders.DataObject.getNodeDelegate(DataObject.java:273)
        at org.netbeans.modules.javahelp.HelpCtxProcessor$ShortcutAction.updateText(HelpCtxProcessor.java:250)
        at org.netbeans.modules.javahelp.HelpCtxProcessor$ShortcutAction.<init>(HelpCtxProcessor.java:189)
        at org.netbeans.modules.javahelp.HelpCtxProcessor$2.startElement(HelpCtxProcessor.java:141)
        at org.xml.sax.helpers.XMLReaderAdapter.startElement(XMLReaderAdapter.java:335)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:533)
        at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:220)
        at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:819)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:872)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(XMLDocumentScannerImpl.java:1157)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1794)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)
        at org.xml.sax.helpers.XMLReaderAdapter.parse(XMLReaderAdapter.java:225)
        at org.netbeans.modules.javahelp.HelpCtxProcessor.instanceCreate(HelpCtxProcessor.java:152)
        at org.openide.loaders.FolderInstance.instanceForCookie(FolderInstance.java:572)
        at org.openide.loaders.FolderInstance$HoldInstance.instanceCreate(FolderInstance.java:1122)
        at org.openide.loaders.FolderInstance$1R.instances(FolderInstance.java:692)
        at org.openide.loaders.FolderInstance$1R.run(FolderInstance.java:713)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)