Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via GitHub by benoitheinrich
, 1 year ago
TreeSetTest$Obj cannot be cast to java.lang.Comparable
java.lang.ClassCastException: TreeSetTest$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 undefined.TreeSetTest.testFlapMap(TreeSetTest.java:24)