FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
The field "entrySetView" in java.util.TreeMap$NavigableSubMap is initialized to null. It is never updated to non-null value.

The method entrySet() in AscendingSubMap and DescendingSubMap look like this:

        public Set<Map.Entry<K,V>> entrySet() {
            EntrySetView es = entrySetView;
            return (es != null) ? es : new AscendingEntrySetView();
        }

        public Set<Map.Entry<K,V>> entrySet() {
            EntrySetView es = entrySetView;
            return (es != null) ? es : new DescendingEntrySetView();
        }

Is this an intention or should it be the following:

        public Set<Map.Entry<K,V>> entrySet() {
            EntrySetView es = entrySetView;
            return (es != null) ? es : (entrySetView = new AscendingEntrySetView());
        }

        public Set<Map.Entry<K,V>> entrySet() {
            EntrySetView es = entrySetView;
            return (es != null) ? es : (entrySetView = new DescendingEntrySetView());
        }


REPRODUCIBILITY :
This bug can be reproduced always.