Few test are throwing Concurrent Modification Exception Intermittently. Since the issue is intermittent and from the log and code review, It is found that the shared variable `fileCache` is used in comparison with the `newFileCache` where the comparison invokes the iterator method in AbstractList class. Since based on vector documentation it was evident that listIterator are fail-fast iterators and hence it would be better to make a separate local copy of vectors for comparing operations. The same is implemented and tested in CI system which shows green.
------------- Commit messages: - Fix Changes: https://git.openjdk.org/jdk/pull/13783/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13783&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8307091 Stats: 18 lines in 1 file changed: 8 ins; 2 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/13783.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13783/head:pull/13783 PR: https://git.openjdk.org/jdk/pull/13783
