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Joiner is a Java library which allows to create type-safe JPA queries.

There is a newer version: 1.22

package cz.encircled.joiner.util;

/**
 * Assert util methods
 *
 * @author Vlad on 14-Aug-16.
 */
public class Assert {

    public static void notNull(Object object) {
        if (object == null) {
            throw new IllegalArgumentException("Argument must be not null!");
        }
    }

    public static void assertThat(boolean predicate) {
        if (!predicate) {
            throw new IllegalArgumentException("Predicate must be true!");
        }
    }

}