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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.util.debug;

import java.util.Set;

import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.TypeElement;

/**
 * Empty simple processor.
 *
 * It is useful in debugging compiler behavior with an annotation processor
 * present.
 *
 */
@SupportedAnnotationTypes("*")
public class EmptyProcessor extends AbstractProcessor {

    @Override
    public boolean process(Set annotations,
            RoundEnvironment roundEnv) {
        System.out.println("Empty Processor run!");
        return false;
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latest();
    }
}