Dima1224 opened a new pull request, #251:
URL: https://github.com/apache/commons-jxpath/pull/251
The method ValueUtils::dynamicPropertyHandlerMap() performs an unsafe
HashMap.computeIfAbsent() operation which can result in a
ConcurrentModificationException in multi-threaded environments. This method is
invoked when creating a new JXPathContext, so it is likely to be invoked in
parallel and fail in multi-threaded environments.
This pull request simply replaces the HashMap with a ConcurrentHashMap,
which is a low-risk operation and carries minimal performance penalty. The
change is tested via a unit test which isn't guaranteed to fail since it relies
on a race condition, but is very likely to fail due to the high concurrency it
simulates.
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