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 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 the high-level locking facilities provided by the interfaces; use of the intrinsic locks is prohibited. This problem generally arises when code is refactored from intrinsic locking to the java.util.concurrent dynamic-locking utilities.
Noncompliant Code Example (ReentrantLock
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The doSomething() method in this noncompliant code example synchronizes on the intrinsic lock of an instance of ReentrantLock rather than on the reentrant mutual exclusion Lock encapsulated by ReentrantLock.
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