execute JDBC batch update; nested exception is org.hibernate.exception.DataException: Could not execute JDBC batch update</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>Could not execute JDBC batch update; nested exception is org.hibernate.exception.DataException: Could not execute JDBC batch update</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; nested exception is org.hibernate.exception.DataException: Could not execute JDBC batch update