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JLM_JSR166_UTILCONCURRENT_MONITORENTER

JLM: Synchronization performed on util.concurrent instance (JLM_JSR166_UTILCONCURRENT_MONITORENTER)

 This method performs synchronization an object that is an instance of
a class from the java.util.concurrent package (or its subclasses). Instances
of these classes have their own concurrency control mechanisms that are orthogonal to
the synchronization provided by the Java keyword synchronized. For example,
synchronizing on an AtomicBoolean will not prevent other threads
from modifying the  AtomicBoolean.
Such code may be correct, but should be carefully reviewed and documented,
and may confuse people who have to maintain the code at a later date.