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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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package org.checkerframework.framework.qual;

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

/**
 * A meta-annotation that indicates that an annotation is a postcondition
 * annotation, i.e., a type-specialized version of {@link EnsuresQualifier}.
 * The annotation that is annotated as {@link PostconditionAnnotation} must have
 * a value called {@code value} that is an array of {@code String}s of the same
 * format and with the same meaning as the value {@code expression} in
 * {@link EnsuresQualifier}.
 *
 * 
 * The value {@code qualifier} that is necessary for a postcondition specified
 * with {@link EnsuresQualifier} is hard-coded here with the value
 * {@code qualifier}.
 *
 * @author Stefan Heule
 * @see EnsuresQualifier
 *
 */
@Target({ ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface PostconditionAnnotation {
    /** The hard-coded qualifier for the postcondition. */
    Class qualifier();
}