Instance level SimpleJdbcCall thread safe?

[fphan]

(I'm using Spring 2.5.1.)
Seeing that a SimpleJdbcCall instance always uses the same parameter names (and types) and ParameterizedRowMapper, I started to declare each SimpleJdbcCall as instance variable in my DAO. In each DAO method, I would instantiate a new SimpleJdbcCall only if the instance is null:

public class JdbcCoursesDAO extends SimpleJdbcDaoSupport implements CoursesDAO {

    private SimpleJdbcCall sprocAddCourse;

    // Stored procedure name:
    public static final String SP_ADD_COURSE = "Courses_DB.sp_addCourse";

    public Map addCourseDefinition(CourseCatalogRow row) throws SQLException {
        if (sprocAddCourse == null) {
            sprocAddCourse = new SimpleJdbcCall(getJdbcTemplate())
                    .withProcedureName(SP_ADD_COURSE)
                    .withoutProcedureColumnMetaDataAccess()
                    .useInParameterNames("course_name"
                                         , "cat_id"
                                         , "description"
                                         , "type_id"
                                         , "active")
                    .declareParameters(
                                        new SqlParameter("course_name", Types.VARCHAR),
                                        new SqlParameter("description", Types.VARCHAR),
                                        new SqlParameter("cat_id", Types.NUMERIC),
                                        new SqlParameter("type_id", Types.NUMERIC),
                                        new SqlParameter("active", Types.NUMERIC),
                                        new SqlOutParameter("coursedef_id", Types.NUMERIC)
                                      )
                    .returningResultSet("RESULT_SET", new CourseCatalogRowMapper());
        }
        
        SqlParameterSource in = new MapSqlParameterSource()
                .addValue("course_name", row.getCourse_name())
                .addValue("cat_id", row.getCat_id())
                .addValue("description", row.getDescription())
                .addValue("type_id", row.getType_id())
                .addValue("active", row.isActive());
        
        Map out = sprocAddCourse.execute(in);
        
        return out;
    }

Is this approach thread-safe?
I'm thinking that since SqlParameterSource is local, that takes care of thread-safety. Is my thinking correct?

Thanks.