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Root Cause Analysis

  1. java.lang.ClassCastException

    corejava.compare.Employee cannot be cast to java.lang.Comparable

    at java.util.TreeMap.put()
  2. Java RT
    TreeSet.add
    1. java.util.TreeMap.put(Unknown Source)
    2. java.util.TreeSet.add(Unknown Source)
    2 frames
  3. corejava.compare
    SortedSetTest.main
    1. corejava.compare.SortedSetTest.main(SortedSetTest.java:17)
    1 frame