java.lang.OutOfMemoryError: Java heap space
   at java.util.TreeMap.put(TreeMap.java:540)
   at java.util.TreeSet.add(TreeSet.java:255)
   at org.openide.util.RequestProcessor.prioritizedEnqueue(RequestProcessor.java:628)
   at org.openide.util.RequestProcessor.enqueue(RequestProcessor.java:607)
   at org.openide.util.RequestProcessor$TickTac.run(RequestProcessor.java:2234)