Using Program must not use instance locks to protect static shared data is forbidden, because instance locks are ineffective when two or more instances of the class are created. Consequently, failure to use a static lock object leaves the shared state unprotected against concurrent access. Lock objects for classes that can interact with untrusted code must also be private and final, as shown in rule LCK00-J. Use private final lock objects to synchronize classes that may interact with untrusted code.
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