Programs must not lock on an object of a class that implements Instances of classes that implement either or both of the Lock and Condition interfaces of the java.util.concurrent.locks package are known as high-level concurrency objects. Using the intrinsic locks of these classes such objects is a questionable practice even in cases where the code may appear to function correctly. Consequently, programs that interact with such objects must use only high-level locking facilities provided by the interfaces; use of the intrinsic locks is forbidden. This problem generally arises when code is refactored from intrinsic locking to the java.util.concurrent dynamic-locking utilities.
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