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Explicitly define the name of the class (superclass here) in the synchronization block. This can be achieved in two ways. Onw way is to explicitly pass the superclass's instance.Class.forName().
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synchronized(SuperclassName.class) { ... }
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The second way is to use the Class.forName() method.
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synchronized(Class.forName("SuperclassName")) { ... }
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Finally, it is important to recognize the entities with which synchronization is required rather than indiscreetly scavenging for variables or objects to synchronize on.
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