在实体管理器中返回Postgresql json

我试图使用实体管理器返回一个POSTGRESQL 9.6存储的 过程/函数JSON结果。这只返回1条记录

**POSTGRESQL TABLES**

TABLE: **customer**
 [enter image description here][1]

TABLE: **names**
 [enter image description here][2]

TABLE: **address**
 [enter image description here][3]

**POSTGRESQL STORED PROCEDURE**

CREATE OR REPLACE FUNCTION  jsp_member_main(
    IN cid numeric,
    OUT t json)
    RETURNS json
    LANGUAGE 'sql'
    COST 100.0
    VOLATILE 
AS $function$

select json_agg(t)
from (SELECT 
c.id customer_id,
n.first_name,
n.last_name,
a.street1,
a.city,
a.state,
a.postal_code

FROM customer c 
LEFT OUTER JOIN names n ON (c.name_id = n.id)
LEFT OUTER JOIN address a ON (c.id = a.customer_id)
WHERE c.id=cid
) t;
$function$
 
**POSTGRESQL STORED PROCEDURE QUERY**

select jsp_member_main(99964);

**RETURNS VIA SQL**

[{"customer_id":99964,"first_name":"JOHN","last_name":"SMITH","street1":"123 W. MAIN ST.","city":"SPINDALE","state":"MD","postal_code":"21791"}]

到目前为止，一切顺利。现在我尝试使用实体管理器返回结果：

    @GET
    @Path("SP Member Main")
    @Produces({"application/xml", "application/json"})
    public JSONObject memberMain() throws JSONException {
        EntityManager em =  getEntityManager();
        StoredProcedureQuery storedProcedure = em.createStoredProcedureQuery("jsp_member_main");
        storedProcedure.registerStoredProcedureParameter("cid", Integer.class, ParameterMode.IN);
        storedProcedure.registerStoredProcedureParameter("t", JSONObject.class, ParameterMode.OUT);
        storedProcedure.setParameter("cid", 99964);
        storedProcedure.execute();
        JSONObject retval = (JSONObject) storedProcedure.getOutputParameterValue("t");
        return retval;
    }

无论我尝试哪种返回（输出）类型的类，都会出现以下错误：

***javax.ejb.EJBException
root cause
javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.postgresql.util.PSQLException: A CallableStatement function was executed and the out parameter 1 was of type java.sql.Types=1111 however type java.sql.Types=12 was registered.
Error Code: 0
Call: {?= CALL ross.jsp_member_main(?)}
    bind => [2 parameters bound]
Query: ResultSetMappingQuery()***

我尝试过使用字符串类，返回到字符串、JSONArray将JSONObject合并到JSONArray、java对象等，但没有任何效果

是否有办法通过实体管理器从Postgresql存储过程/函数返回json？非常感谢您的考虑