Session session = HibernateUtil.getSessionFactory().openSession();
            Query query = session.getNamedQuery("EMPLOYEE.PRC_HB_EMP_SP1");
                    query.setParameter("IN_EMPID", empId);

              List<Employee> empList = query.list();
              System.out.println(empList);

@Entity
@Table(name = "EMPLOYEE")
//@org.hibernate.annotations.NamedNativeQuery(name = "EMPLOYEE.PRC_HB_EMP_SP1", query = "call PRC_HB_EMP_SP1(?,:IN_EMPID)", callable = true, resultClass = Employee.class)
@org.hibernate.annotations.NamedNativeQuery(name = "EMPLOYEE.PRC_HB_EMP_SP1", query = "call PRC_HB_EMP_SP1(?,:IN_EMPID)", callable = true, resultClass = Employee.class)

public class Employee implements Serializable {....}

create or replace PROCEDURE PRC_HB_EMP_SP1
(
  Out_value OUT SYS_REFCURSOR,
  IN_EMPID  NUMBER
)
AS

BEGIN

   open Out_value for
    SELECT EMPID,EMPNAME
            FROM EMPLOYEE
    WHERE  EMPID = IN_EMPID;

END PRC_HB_EMP_SP1;