hi, 
i'm new in GWT, 
i've added a gwt-validation library,
error appears when hibernate have to do merge
 /*

 * (non-Javadoc)

 * @see org.skyway.spring.util.dao.JpaDao#store(java.lang.Object)

 */

@Transactional

public T store(T toStore) {

if (canBeMerged(toStore)) {

return merge(toStore);

}

else {

return persist(toStore);

}
 } 

some helps?

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