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via Oracle Community by 807555, 1 year ago
java.lang.ClassCastException: java.net.URL	at java.util.TreeMap.compare(Unknown Source)	at java.util.TreeMap.getEntry(Unknown Source)	at java.util.TreeMap.containsKey(Unknown Source)	at java.util.TreeSet.contains(Unknown Source)	at TESTTREESET.testIt(TESTTREESET.java:27)