Map
key or Set
element was overwritten in the sequence of add/put calls or using a Java 9 factory method
like Set.of
(which will result in runtime exception). This usually occurs due to copy-paste error. Example:
map.put("A", 1); map.put("B", 2); map.put("C", 3); map.put("D", 4); map.put("A", 5); // duplicating key "A", overwrites previously written entry
New in 2017.3