Possible race condition could happen if another thread put value into 'metricsCache' by the same key. We can use `ConcurrentHashMap.remove(key, value)` method to avoid it.
------------- Commit messages: - [PATCH] Fix possible concurrency problem in FontDesignMetrics.KeyReference.dispose method Changes: https://git.openjdk.java.net/jdk/pull/5753/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5753&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8274651 Stats: 9 lines in 1 file changed: 0 ins; 6 del; 3 mod Patch: https://git.openjdk.java.net/jdk/pull/5753.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/5753/head:pull/5753 PR: https://git.openjdk.java.net/jdk/pull/5753
