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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: NotEmpty.java 15133 2008-08-20 10:05:57Z hardy.ferentschik $
package org.hibernate.validator;

import java.lang.annotation.Documented;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import java.lang.annotation.ElementType;
import java.lang.annotation.RetentionPolicy;

/**
 * Check that a String is not empty (not null and length > 0)
 * or that a Collection (or array) is not empty (not null and length > 0)
 *
 * @author Emmanuel Bernard
 */
@Documented
@ValidatorClass(NotEmptyValidator.class)
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention( RetentionPolicy.RUNTIME )
public @interface NotEmpty {
	String message() default "{validator.notEmpty}";
}