Found one Java-level deadlock:
=============================
"Folder recognizer":
  waiting to lock monitor 0x080bad14 (object 0xec3b8af0, a java.lang.Class),
  which is held by "main"
"main":
  waiting to lock monitor 0x080babd4 (object 0xe3990df8, a org.openide.loaders.XMLDataObject$InfoLkp$InfoPair),
  which is held by "Folder recognizer"

Java stack information for the threads listed above:
===================================================
"Folder recognizer":
        at org.openide.util.lookup.MetaInfServicesLookup$P.getInstance(MetaInfServicesLookup.java:399)
        - waiting to lock <0xec3b8af0> (a java.lang.Class)
        at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:894)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:435)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:388)
        at org.openide.filesystems.URLMapper.getInstances(URLMapper.java:274)
        at org.openide.filesystems.URLMapper.findURL(URLMapper.java:104)
        at org.openide.filesystems.FileObject.getURL(FileObject.java:749)
        at org.openide.filesystems.FileObject.toString(FileObject.java:136)
        at java.lang.String.valueOf(String.java:2577)
        at java.lang.StringBuffer.append(StringBuffer.java:220)
        - locked <0xe3998088> (a java.lang.StringBuffer)
        at org.netbeans.modules.javahelp.HelpSetProcessor.attachTo(HelpSetProcessor.java:67)
        at org.openide.loaders.XMLDataObject$InfoLkp$InfoPair.getInstance(XMLDataObject.java:1722)
        - locked <0xe3990df8> (a org.openide.loaders.XMLDataObject$InfoLkp$InfoPair)
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:344)
        at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:180)
        at org.openide.loaders.XMLDataObject$InfoParser.lookupCookie(XMLDataObject.java:1082)
        at org.openide.loaders.XMLDataObject.getCookie(XMLDataObject.java:312)
        at org.openide.loaders.FolderLookup$ICItem.init(FolderLookup.java:433)
        at org.openide.loaders.FolderLookup$ICItem.instanceOf(FolderLookup.java:480)
        at org.openide.util.lookup.InheritanceTree$1VerifyJob.before(InheritanceTree.java:363)
        at org.openide.util.lookup.AbstractLookup$ISE.recover(AbstractLookup.java:1302)
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:428)
        at org.openide.util.lookup.ProxyLookup$R.initResults(ProxyLookup.java:292)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:490)
        at org.openide.util.lookup.ProxyLookup$R.beforeLookup(ProxyLookup.java:507)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:496)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:413)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:388)
        at org.openide.filesystems.MIMESupport$CachedFileObject.getResolvers(MIMESupport.java:137)
        at org.openide.filesystems.MIMESupport$CachedFileObject.resolveMIME(MIMESupport.java:179)
        at org.openide.filesystems.MIMESupport$CachedFileObject.getMIMEType(MIMESupport.java:171)
        at org.openide.filesystems.MIMESupport.findMIMEType(MIMESupport.java:81)
        at org.openide.filesystems.FileUtil.getMIMETypeOrDefault(FileUtil.java:864)
        at org.openide.filesystems.AbstractFileObject.getMIMEType(AbstractFileObject.java:147)
        at org.openide.filesystems.MultiFileObject.getMIMEType(MultiFileObject.java:497)
        at org.openide.filesystems.MultiFileObject.getMIMEType(MultiFileObject.java:497)
        at org.openide.loaders.ExtensionList.isRegistered(ExtensionList.java:134)
        at org.openide.loaders.UniFileLoader.findPrimaryFile(UniFileLoader.java:62)
        at org.apache.tools.ant.module.loader.AntProjectDataLoader.findPrimaryFile(AntProjectDataLoader.java:49)
        at org.openide.loaders.MultiFileLoader.findPrimaryFileImpl(MultiFileLoader.java:262)
        at org.openide.loaders.MultiFileLoader.handleFindDataObject(MultiFileLoader.java:65)
        at org.openide.loaders.DataObjectPool.handleFindDataObject(DataObjectPool.java:123)
        at org.openide.loaders.DataLoader.findDataObject(DataLoader.java:362)
        at org.openide.loaders.DataLoaderPool.findDataObject(DataLoaderPool.java:402)
        at org.openide.loaders.FolderList.createBoth(FolderList.java:701)
        at org.openide.loaders.FolderList.getObjects(FolderList.java:512)
        at org.openide.loaders.FolderList.access$200(FolderList.java:50)
        at org.openide.loaders.FolderList$ListTask.run(FolderList.java:880)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:471)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:904)
"main":
        at org.openide.loaders.XMLDataObject$InfoLkp$InfoPair.getInstance(XMLDataObject.java:1701)
        - waiting to lock <0xe3990df8> (a org.openide.loaders.XMLDataObject$InfoLkp$InfoPair)
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:344)
        at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:180)
        at org.openide.loaders.XMLDataObject$InfoParser.lookupCookie(XMLDataObject.java:1082)
        at org.openide.loaders.XMLDataObject.getCookie(XMLDataObject.java:312)
        at org.openide.loaders.FolderLookup$ICItem.init(FolderLookup.java:433)
        at org.openide.loaders.FolderLookup$ICItem.instanceOf(FolderLookup.java:480)
        at org.openide.util.lookup.InheritanceTree$1VerifyJob.before(InheritanceTree.java:363)
        at org.openide.util.lookup.InheritanceTree.classToNode(InheritanceTree.java:420)
        at org.openide.util.lookup.InheritanceTree.searchClass(InheritanceTree.java:563)
        at org.openide.util.lookup.InheritanceTree.lookup(InheritanceTree.java:214)
        at org.openide.util.lookup.InheritanceTree.registerReferenceToResult(InheritanceTree.java:974)
        at org.openide.util.lookup.DelegatingStorage.registerReferenceToResult(DelegatingStorage.java:137)
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:419)
        at org.openide.util.lookup.ProxyLookup$R.initResults(ProxyLookup.java:292)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:490)
        at org.openide.util.lookup.ProxyLookup$R.beforeLookup(ProxyLookup.java:507)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:496)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:413)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:388)
        at org.openide.util.SharedClassObject.findObject(SharedClassObject.java:521)
        - locked <0xec3b9bb8> (a java.lang.String)
        at org.netbeans.modules.httpserver.HttpServerURLMapper.<clinit>(HttpServerURLMapper.java:37)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
        at java.lang.Class.newInstance0(Class.java:350)
        at java.lang.Class.newInstance(Class.java:303)
        at org.openide.util.lookup.MetaInfServicesLookup$P.getInstance(MetaInfServicesLookup.java:406)
        - locked <0xec3b8af0> (a java.lang.Class)
        at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:894)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:435)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:388)
        at org.openide.filesystems.URLMapper.getInstances(URLMapper.java:274)
        at org.openide.filesystems.URLMapper.findURL(URLMapper.java:104)
        at org.openide.filesystems.FileObject.getURL(FileObject.java:749)
        at org.openide.loaders.XMLDataObject$InfoParser.waitFinished(XMLDataObject.java:1118)
        at org.openide.loaders.XMLDataObject$InfoParser.waitFinished(XMLDataObject.java:1093)
        at org.openide.loaders.XMLDataObject.getCookie(XMLDataObject.java:310)
        at org.openide.loaders.FolderLookup$ICItem.init(FolderLookup.java:433)
        at org.openide.loaders.FolderLookup$ICItem.instanceOf(FolderLookup.java:480)
        at org.openide.util.lookup.InheritanceTree$1VerifyJob.before(InheritanceTree.java:363)
        at org.openide.util.lookup.AbstractLookup$ISE.recover(AbstractLookup.java:1302)
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:428)
        at org.openide.util.lookup.ProxyLookup$R.initResults(ProxyLookup.java:292)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:490)
        at org.openide.util.lookup.ProxyLookup$R.beforeLookup(ProxyLookup.java:507)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:496)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:413)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:388)
        at org.openide.filesystems.URLMapper.getInstances(URLMapper.java:274)
        at org.openide.filesystems.URLMapper.findURL(URLMapper.java:104)
        at org.openide.filesystems.FileObject.getURL(FileObject.java:749)
        at org.openide.loaders.XMLDataObject$InfoParser.waitFinished(XMLDataObject.java:1118)
        at org.openide.loaders.XMLDataObject$InfoParser.waitFinished(XMLDataObject.java:1093)
        at org.openide.loaders.XMLDataObject.getCookie(XMLDataObject.java:310)
        at org.openide.loaders.FolderLookup$ICItem.init(FolderLookup.java:433)
        at org.openide.loaders.FolderLookup$ICItem.instanceOf(FolderLookup.java:480)
        at org.openide.util.lookup.InheritanceTree$1VerifyJob.before(InheritanceTree.java:363)
        at org.openide.util.lookup.AbstractLookup$ISE.recover(AbstractLookup.java:1302)
        at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:428)
        at org.openide.util.lookup.ProxyLookup$R.initResults(ProxyLookup.java:292)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:490)
        at org.openide.util.lookup.ProxyLookup$R.beforeLookup(ProxyLookup.java:507)
        at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:496)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:413)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:388)
        at org.openide.ErrorManager$DelegatingErrorManager.resultChanged(ErrorManager.java:710)
        at org.openide.util.lookup.AbstractLookup.notifyListeners(AbstractLookup.java:462)
        at org.openide.util.lookup.ProxyLookup$R.resultChanged(ProxyLookup.java:481)
        at org.openide.util.lookup.ProxyLookup.setLookups(ProxyLookup.java:150)
        at org.netbeans.core.startup.MainLookup.doInitializeLookup(MainLookup.java:152)
        at org.netbeans.core.startup.MainLookup.modulesClassPathInitialized(MainLookup.java:102)
        at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:264)
        at org.netbeans.ModuleManager.enable(ModuleManager.java:898)
        at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:377)
        at org.netbeans.core.startup.ModuleList.trigger(ModuleList.java:311)
        at org.netbeans.core.startup.ModuleSystem.restore(ModuleSystem.java:243)
        at org.netbeans.core.startup.Main.getModuleSystem(Main.java:202)
        at org.netbeans.core.startup.Main.start(Main.java:363)
        at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:90)
        at java.lang.Thread.run(Thread.java:595)

Found 1 deadlock.