JPA query.getResultList()

Question

The following is the Oracle DB define:

classId char(8)    userId char(1)
 666666                  2

I'm creating a query to get a list from DB with EclipseLink 2.3.1. the following is the code.

Query query = em.createQuery("select classId from user where userId = ?")
query.setParameter(1,"2");
List<Object[]> list = query.getResultList();

But I get the classId is "666666" not "666666 ". It seems the query.getResultList() auto delete the whitespace? Why?