java.lang.ClassCastException: SingletonCheck cannot be cast to java.lang.Comparable

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via Coderanch by Patrio Jensen, 1 year ago
SingletonCheck cannot be cast to java.lang.Comparable
java.lang.ClassCastException: SingletonCheck cannot be cast to java.lang.Comparable
at java.util.concurrent.ConcurrentSkipListMap.comparable(ConcurrentSkipListMap.java:621)
at java.util.concurrent.ConcurrentSkipListMap.doPut(ConcurrentSkipListMap.java:862)
at java.util.concurrent.ConcurrentSkipListMap.putIfAbsent(ConcurrentSkipListMap.java:1893)
at java.util.concurrent.ConcurrentSkipListSet.add(ConcurrentSkipListSet.java:202)
at test3.ThreadRunner.run(ThreadRunner.java:15)
at java.lang.Thread.run(Thread.java:619)

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