Loading External Classes

Hey I can't figure out how to load classes from another jar on the fly.

I've try with that :

Code:

 
            URLClassLoader cl = new URLClassLoader(new URL[]{myFile.toURI().toURL()});
            try {
                cl.loadClass("org.package.myclass");
                cl.close();
                Class.forName("org.package.myclass");
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }

But I' still getting ClassNotFoundException : org.package.myclass

Any Idea ?

 

I would do it like this:

Code:

Class<?> clazz = Class.forName("org.package.myclass", true, cl);

I also want to load external classes, but I fail at the casting of the classes.

 

Yes it permits not to fire exception.
But I'm not sure that it really solved the problems.

In fact I used that Class loader to load SQL Drivers.
But I still get some errors :

java.sql.SQLException: No suitable driver found for jdbcostgresql://127.0.0.1:3306/myDatabase

 

cl.loadClass("org.package.myclass");
Is myclass supposed to be lower case?

 

andf54
No it's just an example.
In fact I try this with postgresql driver
But when I want to get the connection, it sends me that it's not a suitable driver.
So I think that the Class.forName(org.postresql.Driver, true, cl); doesn't throw an error but doesn't really load.