java.lang.ClassCastException

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  • java.lang.ClassCastException: TreeSetTest$Obj cannot be cast to java.lang.Comparable at javaslang.collection.Comparators.lambda$naturalComparator$7c28a3e$1(Comparators.java:30) at javaslang.collection.RedBlackTreeModule$Node.insert(RedBlackTree.java:670) at javaslang.collection.RedBlackTree.insert(RedBlackTree.java:103) at javaslang.collection.RedBlackTree.ofAll(RedBlackTree.java:90) at javaslang.collection.TreeSet.ofAll(TreeSet.java:180) at javaslang.collection.TreeSet.flatMap(TreeSet.java:584) at javaslang.collection.TreeSet.flatMap(TreeSet.java:589) at TreeSetTest.testFlapMap(TreeSetTest.java:24)
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