Bug ID: JDK-7175464 entrySetView field is never updated in NavigableSubMap

Type: Bug
Component: core-libs
Sub-Component: java.util:collections
Affected Version: 7

Priority: P4
Status: Closed
Resolution: Fixed
OS: windows_7
CPU: x86

Submitted: 2012-06-08
Updated: 2013-02-08
Resolved: 2012-11-29

Versions (Unresolved/Resolved/Fixed)

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JDK 8
8 b68Fixed

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.