Can't read with native query a type of CHAR(2)

[jadtn]

Hello
I'm working with mysql 5 / jboss4.2.2/EJB3/JDK6
I want from a nativequery read a field of CHAR(n) in a database, when I user varchar , it s works, but if i use char(n), I always get a Character instead of a String.

CREATE TABLE testchar(
myid CHAR(2) PRIMARY KEY
)

When i user native query to retrive data then I get a java.lang.Character instead of a String.

q=em.createNativeQuery("SELECT myid FROM testchar");
q.setMaxResults(2);
List<Object[]> r= q.getResultList();
log.info("class="+ r.get(0).getClass()+" "+r.get(0));
 -->return java.lang.Character and value is the first character of the row

There is someone who have an idea of what is wrong?
Thanks