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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.common.subtyping;

import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.common.subtyping.qual.Unqualified;
import org.checkerframework.framework.type.AnnotationClassLoader;

import java.lang.annotation.Annotation;

public class SubtypingAnnotationClassLoader extends AnnotationClassLoader {

    public SubtypingAnnotationClassLoader(BaseTypeChecker checker) {
        super(checker);
    }

    // Unqualified is a supported annotation for the Subtyping Checker, and is loaded only if listed
    // in -Aquals. It intentionally has an empty @Target meta-annotation. All other annotations used
    // with the subtyping checker must have a well-defined @Target meta-annotation.
    @Override
    protected boolean hasWellDefinedTargetMetaAnnotation(Class annoClass) {
        return super.hasWellDefinedTargetMetaAnnotation(annoClass)
                || annoClass == Unqualified.class;
    }
}