java.lang.OutOfMemoryError: GC overhead limit exceeded
   at java.util.HashMap.resize(HashMap.java:703)
   at java.util.HashMap.putVal(HashMap.java:628)
   at java.util.HashMap.put(HashMap.java:611)
   at java.util.HashSet.add(HashSet.java:219)
   at java.util.AbstractCollection.addAll(AbstractCollection.java:344)
   at java.util.LinkedHashSet.<init>(LinkedHashSet.java:169)
   at org.openide.nodes.EntrySupportDefault.setEntries(EntrySupportDefault.java:281)
   at org.openide.nodes.EntrySupport.setEntries(EntrySupport.java:83)
   at org.openide.nodes.Children$Keys$2.run(Children.java:1556)
   at org.openide.util.Mutex$1Exec.run(Mutex.java:1259)
   at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1921)
   at org.openide.util.Mutex.postRequest(Mutex.java:1265)
   at org.openide.util.Mutex.postRequest(Mutex.java:1228)
   at org.openide.util.Mutex.postWriteRequest(Mutex.java:592)
   at org.openide.nodes.Children$Keys.applyKeys(Children.java:1565)
   at org.openide.nodes.Children$Keys.setKeys(Children.java:1509)
   at org.openide.nodes.AsynchChildren$1.add(AsynchChildren.java:190)
   at org.netbeans.modules.maven.repository.GroupListChildren.createKeys(GroupListChildren.java:99)
   at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:209)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)