1 EntityManager em = factory.createEntityManager();
2 em.getTransaction().begin();

3 Query query = em.createNativeQuery("select user_id from user_info where name=? ",UserInfo.class)
.setParameter(1, "ram");

4 List <Long> result =(List<Long>)query.getResultList();
error line:->4

getting below errors .
Oct 20, 2012 3:30:29 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 0, SQLState: S0022
Oct 20, 2012 3:30:29 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Column 'Address' not found.

THIS HAS BEEN DUE TO USERINFO.CLASS I REMOVED AND IT WORKS.
AS IT RETUEN OBJECT OF USERINFO CLASS.

3 Query query = em.createNativeQuery("select user_id from user_info where name=? ",UserInfo.class)
.setParameter(1, "ram");