emopers opened a new pull request #399: Synchronize before looping over synchronized collection URL: https://github.com/apache/commons-lang/pull/399 In `CharSet.java`, `set = Collections.synchronizedSet(new HashSet<>())` is iterated over without synchronization. According to [Java API] (https://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#synchronizedCollection%28java.util.Collection%29), it is recommended that user manually synchronizes each iteration over the synchronized collection to reduce non-determinism. This pull request improves the condition by synchronizing a loop which loops over the synchronized collection.
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