org.checkerframework.common.value.qual

Annotation Type UnknownVal

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

UnknownVal is a type annotation indicating that the expression's value is not known at compile type.

See the Checker Framework Manual:

Constant Value Checker