java.lang.OutOfMemoryError: Java heap space
   at java.util.HashMap.newNode(HashMap.java:1742)
   at java.util.HashMap.putVal(HashMap.java:630)
   at java.util.HashMap.put(HashMap.java:611)
   at java.util.HashSet.add(HashSet.java:219)
   at org.openide.util.RequestProcessor.enqueue(RequestProcessor.java:612)
   at org.openide.util.RequestProcessor$TickTac.run(RequestProcessor.java:2260)