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Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

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//$Id: AssertFalseValidator.java 15765 2009-01-09 14:56:30Z hardy.ferentschik $
package org.hibernate.validator;

import java.io.Serializable;


/**
 * Check if a given object is false or not
 *
 * @author Gavin King
 * @author Hardy Ferentschik
 */
public class AssertFalseValidator implements Validator, Serializable {

    public boolean isValid(Object value) {
        if (value == null) return true;
        if (value instanceof Boolean) {
            return !(Boolean) value;
        }
        return false;
    }

    public void initialize(AssertFalse parameters) {
    }

}