ClassCastException with OracleConnection in Oracle 9i

Question

I have a piece of code that works perfectly with Oracle 8i and JDK 1.3.
Now I've migrated to Oracle 9i and JDK 1.4. I continue working with tomcat and I've configured server.xml file (some changes about 'url' and 'username').
I get a ClassCastException when I try to make a explicit cast to OracleConnection of the connection object recovered. This is the code:
public class CargadorRecursos {
     public Connection devuelveConexion()
          throws javax.naming.NamingException, SQLException {
          Context envContext = devuelveContexto();
          DataSource ds = (DataSource) envContext.lookup("jdbc/prosegur");
          Connection conn = ds.getConnection();
          return conn;
in another classes I do:
OracleConnection conn = (OracleConnection) CargadorRecursos.getCargador().devuelveConexion();
and then the ClassCastException is raised in the web browser.
Please, help.

Answer 1

Cast class exception means you are trying to cast an object to something that it can't be case too.
You can determine the actual class of an instance by doing the following...
System.out.println("class=" + myinstance.getClass().getName());
Once you know the class that actually is being used you can determine the course of action to take...
1. It isn't the class that you think it is, something is wrong with your code.
2. Something changed outside of your code and you will have to code around the problem.
3. Class loaders are being used and you are using class instances from two different class loaders - use the same class loader.