A CallableStatement function was executed and the out parameter 1 was of type java.sql.Types=2001 however type java.sql.Types=1111 was registered - postgresql

Question

I am trying to call a STORED PROCEDURE(with a out refcursor parameter) in postgresql through JPA2.1 like this:
public class JpaINParam {
public static void main(String[] args) throws Exception {
EntityManagerFactory emfactory = Persistence
.createEntityManagerFactory("JPA2");
EntityManager entitymanager = emfactory.createEntityManager();
entitymanager.getTransaction().begin();
StoredProcedureQuery q = entitymanager.createNamedStoredProcedureQuery("get_hibernate_dtl");
q.setParameter("modeval", "1");
q.execute();
#SuppressWarnings("unchecked")
List<Student> students = (List<Student>) q.getOutputParameterValue("resultset");
for (Student student : students) {
System.out.println(student.getFname());
}
entitymanager.getTransaction().commit();
entitymanager.close();
try {
// storedProcedure.executeUpdate();
System.out.println("444444444444");
} catch (Exception e) {
e.printStackTrace();
}
}
}
i get the following error:
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services -
2.5.2.v20140319-9ad6abd): 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=2001 however type java.sql.Types=1111 was
registered.
Error Code: 0
Call: {?= CALL get_hibernate_dtl(?)}
bind => [2 parameters bound]
Query: ResultSetMappingQuery(name="get_hibernate_dtl" )
at org.eclipse.persistence.internal.jpa.QueryImpl.getDetailedException(QueryImpl.java:378)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:260)
at org.eclipse.persistence.internal.jpa.StoredProcedureQueryImpl.execute(StoredProcedureQueryImpl.java:316)
at com.javacodegeeks.examples.jpa.service.JpaINParam.main(JpaINParam.java:36)
the following is my entity class:
#NamedStoredProcedureQuery(name="get_hibernate_dtl", procedureName="get_hibernate_dtl", resultClasses={Student.class}, returnsResultSet = true, parameters={
#StoredProcedureParameter(queryParameter="resultset", name="resultset", mode=ParameterMode.REF_CURSOR,type=Class.class),
#StoredProcedureParameter(queryParameter="modeval", name="modeval", mode=ParameterMode.IN,type=String.class)
})
#Entity
public class Student {
#Id
#GeneratedValue(strategy= GenerationType.AUTO)
private int sid;
private String fname;
private String lname;
private String dept;
private int year;
private String email;
public Student() {
// TODO Auto-generated constructor stub
}
public Student(int sid, String fname, String lname, String dept, int year,
String email) {
super();
this.sid = sid;
this.fname = fname;
this.lname = lname;
this.dept = dept;
this.year = year;
this.email = email;
}
public int getSid() {
return sid;
}
public void setSid(int sid) {
this.sid = sid;
}
public String getFname() {
return fname;
}
public void setFname(String fname) {
this.fname = fname;
}
public String getLname() {
return lname;
}
public void setLname(String lname) {
this.lname = lname;
}
public String getDept() {
return dept;
}
public void setDept(String dept) {
this.dept = dept;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
#Override
public String toString() {
return "Student [sid=" + sid + ", fname=" + fname + ", lname=" + lname
+ ", dept=" + dept + ", year=" + year + ", email=" + email
+ "]";
}
}
this is my procedure in postgresql:
CREATE OR REPLACE PROCEDURE dwh.get_hibernate_dtl(resultset OUT ahis_type.refcursor, modeval IN character varying DEFAULT '1'::character varying) AS
query VARCHAR2 (6000);
v_type NUMERIC(3,0);
v_dwh_type_id VARCHAR2(100);
BEGIN
IF (modeval = 1) THEN
QUERY := ' SELECT sid,fname FROM STUDENT ';
END IF;
INSERT INTO tmp_table values ( 'get_hibernate_dtl----Modeval-->'||modeval||'query--->'||QUERY );
OPEN resultset FOR QUERY;
END