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Easiest solution to save and query JPA entities

There is a newer version: 3.2.4

package br.eti.clairton.repository;

import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Predicate;

/**
 * Cria o {@link Predicate} não nulo.
 *
 * @author Clairton Rodrigo Heinzen [email protected]
 */
public class NotNull implements Comparator {
	private static final long serialVersionUID = 1L;
    /**
     * {@inheritDoc}
     */
    @Override
    public Predicate build(final CriteriaBuilder cb, final Expression x, final Object y) {
        return cb.isNotNull(x);
    }

    @Override
    public String toString() {
    	return "!∅";
    }
}