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Java Forum / General / December 2006

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URLClassLoader

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ballpointpenthief - 19 Dec 2006 20:49 GMT
I need to understand ClassLoader s for something, so I am starting with
URLClassLoader to get started. I've fallen down before the first hurdle
unfortunately.
It might be a problem with the URL. I've not touched these before.

If someone could find the problem in this code that would be great.
Matt

import java.net.URLClassLoader;
import java.net.URL;
import java.net.MalformedURLException;

public class Test {

   public static void main(String argv[]) {

       URL[] urls = new URL[1];
       try {
           urls[0] = new URL("file:\\");

       } catch (MalformedURLException ex) {
           System.err.println(ex.getMessage());
       }
       URLClassLoader c = new URLClassLoader(urls);
       try {
           c.loadClass("House"); // There exists a House.class file in
the working directory
       } catch (ClassNotFoundException ex) {
           System.err.println(ex.getMessage()); // I get to here, but
I don't want to!
       }
   }
}
Thomas Hawtin - 19 Dec 2006 21:01 GMT
>             urls[0] = new URL("file:\\");

>         } catch (ClassNotFoundException ex) {
>             System.err.println(ex.getMessage()); // I get to here, but
> I don't want to!

"file:\\" is not a correctly formed file URL. When I change it to
"file:///", it works for me.

Tom Hawtin


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