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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.checker.compilermsgs;

import com.sun.source.tree.Tree;

import java.lang.annotation.Annotation;
import java.util.Set;

import org.checkerframework.checker.compilermsgs.qual.CompilerMessageKey;
import org.checkerframework.checker.propkey.PropertyKeyAnnotatedTypeFactory;
import org.checkerframework.checker.propkey.qual.PropertyKey;
import org.checkerframework.checker.propkey.qual.PropertyKeyBottom;
import org.checkerframework.checker.propkey.qual.UnknownPropertyKey;
import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.framework.type.treeannotator.ImplicitsTreeAnnotator;
import org.checkerframework.framework.type.treeannotator.ListTreeAnnotator;
import org.checkerframework.framework.type.treeannotator.PropagationTreeAnnotator;
import org.checkerframework.framework.type.treeannotator.TreeAnnotator;

/**
 * A PropertyKeyATF that uses CompilerMessageKey to annotate the keys.
 *
 * @author wmdietl
 */
public class CompilerMessagesAnnotatedTypeFactory extends PropertyKeyAnnotatedTypeFactory {

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

    @Override
    protected Set> createSupportedTypeQualifiers() {
        return getBundledTypeQualifiersWithoutPolyAll(
                UnknownPropertyKey.class,
                PropertyKey.class, PropertyKeyBottom.class);
    }

    @Override
    public TreeAnnotator createTreeAnnotator() {
        ImplicitsTreeAnnotator implicitsTreeAnnotator = new ImplicitsTreeAnnotator(this);
        implicitsTreeAnnotator.addTreeKind(Tree.Kind.NULL_LITERAL, PROPKEY_BOTTOM);

        return new ListTreeAnnotator(
                new PropagationTreeAnnotator(this),
                implicitsTreeAnnotator,
                new KeyLookupTreeAnnotator(this, CompilerMessageKey.class)
        );
    }
}