Remove UNKNOWN case: constant doesn't exist in JDK 9 any more and is handled like the default case anyways.
Remove UNKNOWN case: constant doesn't exist in JDK 9 any more and is handled
like the default case anyways.

typetools/annotation-tools,typetools/annotation-tools,eisop/annotation-tools,typetools/annotation-tools,eisop/annotation-tools,eisop/annotation-tools