Use of the keyword 'volatile' is generally used to fine tune a Java application, and therefore, requires a good expertise of the Java Memory Model. Moreover, its range of action is somewhat misknown. Therefore, the volatile keyword should not be used for maintenance purpose and portability. AvoidUsingVolatile (Priority: 1, Ruleset: Multithreading) https://docs.pmd-code.org/snapshot/pmd_rules_java_multithreading.html#avoidusingvolatile