ClassCastException while using @NamedStoredProcedureQuery

Question

Hi,
I'm doing some testing with the TopLink JPA extensions and I'm getting a ClassCastException when executing a stored procedure. The procedure gets executed though.
The procedure is called testjeroen2 in the jeroen package and uses an IN parameter that is an empno.
The entitybean:
@Entity
@NamedStoredProcedureQuery(
name = "remove_employee",
procedureName = "jeroen.testjeroen2",
returnsResultSet = false,
procedureParameters = {
@StoredProcedureParameter(queryParameter = "employee_id")
public class EmpRs {
private int empno;
@Id
public int getEmpno() {
return empno;
public void setEmpno(int empno) {
this.empno = empno;
My unit test:
public void testSp() throws Exception {
EntityManager em = emf.createEntityManager();
Query query = em.createNamedQuery("remove_employee");
query.setParameter("employee_id",5558);
query.getResultList(); //oracle.jdbc.driver.T4CPreparedStatement cannot be cast to java.sql.CallableStatement
// query.getSingleResult(); //oracle.jdbc.driver.T4CPreparedStatement cannot be cast to java.sql.CallableStatement
// query.executeUpdate(); //You cannot call executeUpdate() on this query. It is the incorrect query type.
To execute the query I use the getResultList method and tried the getSingleResult and executeUpdate method. I put the errors I got in the comments next to the lines of code I tried.
Is getResultList the preferred way to execute a stored procedure?
Thanks for your help!
Jeroen van Wilgenburg

Answer 1

thanx mate for the reply,
i am sure that i am storing the same object in the vector.
first of all I tried the same code by writing small class same as yours & it worked fine so i implemented in my real implementation class. But it still gives me classCastException i am not able to understand it why???? Actually my Product class is a stateless session bean(hope u know EJB)
so actually i am storing a remote reference i.e(product)in my vector.But i dont think this should be a problem...
please help....
regards,
ashish