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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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// Upstream version:
// https://javaee.github.io/javaee-spec/javadocs/javax/validation/constraints/NotNull.html

package javax.validation.constraints;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({
    ElementType.METHOD,
    ElementType.FIELD,
    ElementType.ANNOTATION_TYPE,
    ElementType.CONSTRUCTOR,
    ElementType.PARAMETER,
    ElementType.TYPE_USE
})
public @interface NotNull {
    // The following annotation attributes are allowed in source code,
    // but are ignored by the Nullness Checker.

    Class[] groups() default {};

    String message() default "{javax.validation.constraints.NotNull.message}";
    // To not depend on the Payload class, let us use a more flexible bound.
    Class[] payload() default {};
}