At 02:36 PM 1/29/01 +0000, you wrote:
>Hi, I have the next function (see below)
>
>It returns an Enumeration of IdSectorPK. But we know that at the ckient part,
>we have to cast. the problem is that when i cast, i got an error:
> java.lang.ClassCastException: $Proxy1
>
>Why can't i cast to IdSectorPK???????????????????
>
>Please help.
the ejbFindBySectorID method is (should be) declared as returning a Collection.
Transparently in the app server a call to findBySectorID on the home interface
results in the ejbFindBySectorID method to be called, which retrieves the
primary
keys. The app server then uses those primary keys to create entity bean
instances
and load them up using ejbLoad. jBoss then returns to you an array of
dynamic proxies
representing the created beans on the server side.
cheers
craig
>JMi
>
>=========================
>client code
>===========
> IdSectorHome home = (IdSectorHome) PortableRemoteObject.narrow (ref3,
> IdSectorHome.class);
> Enumaration enum = home.findBySectorId("XX");
> while(theEnum.hasMoreElements()) {
> Object obj = theEnum.nextElement();
> System.out.println(" ID: " + obj);
> //System.out.println(" CLASS: " + obj.getClass());
> IdSectorPK pro = (IdSectorPK) obj;//this line build an error
> //java.lang.ClassCastException:
> $Proxy1 at client.main(client.java:143)
> }
>
>
>
>=========================
>Server code
>===========
>Enumeration findBySectorId(String sectorId) throws RemoteException,
>FinderException;//Home interface
>
>public Enumeration ejbFindBySectorId(String sectorId) throws FinderException {
> Connection con = null;
> PreparedStatement ps = null;
> ResultSet rs = null;
> Vector keys = new Vector();
> try {
> con = this.getConnection();
> ps = con.prepareStatement(
> "SELECT id_sect FROM vsect WHERE sector_id = ?");
> ps.setString(1, sectorId);
> //Execute the Query
> rs = ps.executeQuery();
> while(rs.next()) {
> IdSectorPK sectorPk = new IdSectorPK(rs.getInt("ID_SECT"));
> keys.addElement(sectorPk);
> }
> } catch(SQLException se) {
> //throw new EJBException(se);
> } finally {
> try {
> if(rs != null) rs.close();
> if(ps != null) ps.close();
> if(con != null) con.close();
> } catch(SQLException se) {
> se.printStackTrace();
> } finally {
> //Always return collection, even if empty
> return keys.elements();
> }
> }
> }
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