java.lang.NullPointerException
   at com.sun.tools.jdi.EventRequestManagerImpl.request(EventRequestManagerImpl.java:943)
   at com.sun.tools.jdi.EventSetImpl$EventImpl.<init>(EventSetImpl.java:88)
   at com.sun.tools.jdi.EventSetImpl$ThreadedEventImpl.<init>(EventSetImpl.java:175)
   at com.sun.tools.jdi.EventSetImpl$ClassPrepareEventImpl.<init>(EventSetImpl.java:367)
   at com.sun.tools.jdi.EventSetImpl.createEvent(EventSetImpl.java:741)
   at com.sun.tools.jdi.EventSetImpl.build(EventSetImpl.java:628)
   at com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(EventQueueImpl.java:211)
   at com.sun.tools.jdi.EventQueueImpl.remove(EventQueueImpl.java:96)
   at com.sun.tools.jdi.EventQueueImpl.remove(EventQueueImpl.java:82)
   at org.netbeans.modules.debugger.jpda.jdi.event.EventQueueWrapper.remove(EventQueueWrapper.java:74)
   at org.netbeans.modules.debugger.jpda.util.Operator$1.run(Operator.java:216)
   at java.lang.Thread.run(Thread.java:745)