This is entirely doable. You can create a iBatis based DAO object which returns a List (which is a super-interface of a Collection, which a vector can be initialized with)
Code:
public class MyDAOSqlMapClient extends SqlMapClientDaoSupport {
List getComboList(final String param) {
return getSqlMapClientTemplate().queryForList("mystatement", param);
}
}
And you initialize the JComboBox like so:
Code:
JComboBox combo = new JComboBox(new Vector(dao.getComboList("comboName")));