Re: [equinox-dev] Wrapping a Bundle to create a classloader

[Thomas Watson <tjwatson@xxxxxxxxxx>]

You should override loadClass and getResource
instead of the findClass and findResource methods from ClassLoader.

This will prevent the extra boot classloader
lookup which the default ClassLoader implementation does when the parent
is null.  Unfortunately the getResources (plural) method is final
(at least in JRE 1.4.2, I know sun was considering changing this in the
future).  This means that you may get duplicate resources because
the boot classpath will get asked twice to load the resource you are looking
for.  Once from Bundle.getResources and once from the default implementation
of ClassLoader.getResources.

Tom

"Kaegi, Simon" <Simon.Kaegi@xxxxxxxxxx>
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06/07/2006 11:48 AM

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Subject	[equinox-dev] Wrapping a Bundle to create a classloader

Hi,
 
I was about to craft my own implementation
here, but I figure this has probably been done many times before and bound
to be some subtle problems
Can anyone point me at an example.
 
--
...or is it really as simple as:
 
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import org.osgi.framework.Bundle;
 
public class BundleProxyClassLoader
extends ClassLoader {
 
 private Bundle bundle;
 
 public BundleProxyClassLoader(Bundle
bundle) {
     this.bundle = bundle;
 }
 
 public URL findResource(String
name) {
     return bundle.getResource(name);
 }
 
 public Enumeration findResources(String
name) throws IOException {
     return bundle.getResources(name);
 }
 
 public Class findClass(String
name) throws ClassNotFoundException {
     return bundle.loadClass(name);
 }
}
 
-Simon
 
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