Execute a sql procedure with java?

Question

Hi
Got this CREATE OR REPLACE PROCEDURE legg_til_student (p_fnavn student.fornavn%TYPE, p_enavn student.etternavn%TYPE, p_klasseid student.klasseid%TYPE) IS
v_id student.id%TYPE;
BEGIN
     SELECT MAX(id) +1 INTO v_id
     FROM student;     
     IF p_klasseid > 3 THEN
     DBMS_OUTPUT.PUT_LINE ('Ugyldig klasseid');
     ELSE
     INSERT INTO student VALUES (v_id, p_fnavn, p_enavn, p_klasseid);
     END IF;
END;
/  Procedure that are mad in sql+ , the problem is how to run this trough java ?
Thanks :)

Answer 1

Hey I wrote this :
public void registrerStudent(StudentVO student) {
          Connection con = null;
          CallableStatement proc;
          try {
               proc = con.prepareCall("{call legg_til_student(?, ?) }");
               proc.setString(1, student.finnFornavn());
               proc.setString(2, student.finnEtternavn());
               proc.setInt(3, student.finnKlasse());
               proc.execute();
               proc.close();
          } catch (SQLException e) {
               System.out.println("BLEHHH");
               e.printStackTrace();
     }And Testing with this class :
public class Test {
     public static void main(String args[]){
          StudentDAO dao = new StudentDAO();
          StudentVO t = new StudentVO("Arne", "Nilsen", 3);
          dao.registrerStudent(t);
}But i am getting a
java.lang.NullPointerException
     at ver002.student.StudentDAO.registrerStudent(StudentDAO.java:44)
     at ver002.student.Test.main(Test.java:22)
Exception in thread "main" Any idea what i am doing wrong ?