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

/**
 * This is a declaration annotation that applies to type declarations. Some classes conceptually
 * take a type qualifier parameter. This annotation indicates that this class and its subclasses
 * explicitly do not do so. The only reason to write this annotation is when {@code
 * HasQualifierParameter} is enabled by default, by writing {@code HasQualifierParameter} on a
 * package.
 *
 * When a class is {@code @NoQualifierParameter}, all its subclasses are as well.
 *
 * 
One or more top qualifiers must be given for the hierarchies for which there are no qualifier
 * parameters. This annotation may not be written on the same class as {@code HasQualifierParameter}
 * for the same hierarchy.
 *
 * It is an error for a superclass to be {@code @HasQualifierParameter} but a subclass to be
 * {@code @NoQualifierParameter} for the same hierarchy.
 *
 * @see HasQualifierParameter
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Inherited
public @interface NoQualifierParameter {

    /**
     * Class of the top qualifier for the hierarchy for which this class has no qualifier parameter.
     *
     * @return the value
     */
    Class[] value();
}