java.lang.OutOfMemoryError: Java heap space
   at org.openide.filesystems.MultiFileSystem.findResource(MultiFileSystem.java:378)
   at org.openide.filesystems.MultiFileSystem.findResourceOn(MultiFileSystem.java:469)
   at org.openide.filesystems.MultiFileObject.update(MultiFileObject.java:208)
   at org.openide.filesystems.MultiFileObject.<init>(MultiFileObject.java:136)
   at org.openide.filesystems.MultiFileObject.createFile(MultiFileObject.java:560)
   at org.openide.filesystems.AbstractFolder.getChild(AbstractFolder.java:370)
   at org.openide.filesystems.AbstractFolder.getChild(AbstractFolder.java:341)
   at org.openide.filesystems.AbstractFolder.getFileObjectImpl(AbstractFolder.java:483)
   at org.openide.filesystems.AbstractFolder.getFileObject(AbstractFolder.java:475)
   at org.openide.filesystems.FileObject.getFileObject(FileObject.java:974)
   at org.netbeans.core.startup.preferences.PropertiesStorage.toPropertiesFile(PropertiesStorage.java:308)
   at org.netbeans.core.startup.preferences.PropertiesStorage$4.fileChanged(PropertiesStorage.java:387)
   at sun.reflect.GeneratedMethodAccessor5.invoke(GeneratedMethodAccessor5.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:461)
   at com.sun.proxy.$Proxy1.fileChanged(.java:0)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:178)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapperMulti.dispatchAllEventsSync(FCLSupport.java:248)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:137)
   at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:112)
   at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1355)
   at org.openide.filesystems.EventControl.invokeDispatchers(EventControl.java:213)
   at org.openide.filesystems.EventControl.exitAtomicAction(EventControl.java:188)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:129)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:641)
   at org.netbeans.core.startup.preferences.PropertiesStorage.runAtomic(PropertiesStorage.java:352)
   at org.netbeans.core.startup.preferences.NbPreferences$1.run(NbPreferences.java:81)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)