HashEntry<K,V> nextEntry() {
            do {
                if (nextEntry == null)
                    throw new NoSuchElementException();

                lastReturned = nextEntry;
                currentKey = lastReturned.keyRef.get();
                advance();
            } while (currentKey == null); // Skip GC'd keys

            return lastReturned;
        }
Returns an enumeration of the values in this table.

@return an enumeration of the values in this table
@see #values()
commons-profiler/src/main/java/com/navercorp/pinpoint/common/profiler/concurrent/jsr166/ConcurrentWeakHashMap.java