By default, the long-standing policy is that annotation processing is implicitly enabled. As that policy may change in the future (JDK-8306819), users should get some notice they are relying on implicit processing.
JDK-8311073Note if implicit annotation processing is being used
JDK-8311361Note if implicit annotation processing is being used
JDK-8315534Incorrect warnings about implicit annotation processing
JDK-8306819Consider disabling the compiler's default active annotation processing
JDK-8308245Add -proc:full to describe current default annotation processing policy