java.lang.OutOfMemoryError: Java heap space
   at java.util.HashMap.resize(HashMap.java:559)
   at java.util.HashMap.addEntry(HashMap.java:851)
   at java.util.HashMap.put(HashMap.java:484)
   at java.util.Collections$SynchronizedMap.put(Collections.java:2041)
   at org.openide.nodes.EntrySupportDefault.updateAdd(EntrySupportDefault.java:442)
   at org.openide.nodes.EntrySupportDefault.setEntries(EntrySupportDefault.java:295)
   at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:83)
   at org.openide.nodes.Children$Keys$2.run(Children.java:1573)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.leaveImpl(DefaultMutexImplementation.java:681)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.leave(DefaultMutexImplementation.java:614)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation$Privileged.exitReadAccess(DefaultMutexImplementation.java:1322)
   at org.openide.util.Mutex$Privileged.exitReadAccess(Mutex.java:485)
   at org.openide.nodes.Node.fireSubNodesChange(Node.java:1154)
   at org.openide.nodes.EntrySupportDefault.notifyAdd(EntrySupportDefault.java:602)
   at org.openide.nodes.EntrySupportDefault.updateAdd(EntrySupportDefault.java:452)
   at org.openide.nodes.EntrySupportDefault.setEntries(EntrySupportDefault.java:295)
   at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:83)
   at org.openide.nodes.Children$Keys$2.run(Children.java:1573)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation$1Exec.run(DefaultMutexImplementation.java:1016)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1938)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.postRequest(DefaultMutexImplementation.java:1022)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.postRequest(DefaultMutexImplementation.java:985)
   at org.netbeans.modules.openide.util.DefaultMutexImplementation.postWriteRequest(DefaultMutexImplementation.java:356)
   at org.openide.util.Mutex.postWriteRequest(Mutex.java:388)
   at org.openide.nodes.Children$Keys.applyKeys(Children.java:1582)
   at org.openide.nodes.Children$Keys.setKeys(Children.java:1526)
   at org.netbeans.spi.java.project.support.ui.PackageViewChildren.refreshKeys(PackageViewChildren.java:282)
   at org.netbeans.spi.java.project.support.ui.PackageViewChildren.run(PackageViewChildren.java:247)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)