org.checkerframework.checker.nullness.qual

Annotation Type NonNull

@Documented
 @Retention(value=RUNTIME)
 @Target(value={TYPE_USE,TYPE_PARAMETER})
 @SubtypeOf(value=MonotonicNonNull.class)
 @QualifierForLiterals(value=STRING)
 @DefaultQualifierInHierarchy
 @DefaultFor(value=EXCEPTION_PARAMETER)
 @UpperBoundFor(typeKinds={PACKAGE,INT,BOOLEAN,CHAR,DOUBLE,FLOAT,LONG,SHORT,BYTE})
 @DefaultInUncheckedCodeFor(value={PARAMETER,LOWER_BOUND})
public @interface NonNull

NonNull is a type annotation that indicates that an expression is never null.

For fields of a class, the NonNull annotation indicates that this field is never null after the class has been fully initialized. Class initialization is controlled by the Freedom Before Commitment type system, see InitializationChecker for more details.

For static fields, the NonNull annotation indicates that this field is never null after the containing class is initialized.

This annotation is rarely written in source code, because it is the default.

This annotation is associated with the NullnessChecker.

See Also:

Nullable, MonotonicNonNull, NullnessChecker

See the Checker Framework Manual:

Nullness Checker, the bottom type