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

import java.lang.annotation.Documented;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

/**
 * not null constraint
 *
 * @author Gavin King
 */
@Documented
@ValidatorClass(NotNullValidator.class)
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface NotNull {
	String message() default "{validator.notNull}";
}