org.checkerframework.checker.compilermsgs.qual

Annotation Type UnknownCompilerMessageKey

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @InvisibleQualifier
 @SubtypeOf(value={})
 @DefaultQualifierInHierarchy
public @interface UnknownCompilerMessageKey

A String that might or might not be a compiler message key.

See the Checker Framework Manual:

Compiler Message Key Checker