URLClassLoader Issue for Hot Deploy of Classes

[struts]

I am trying to use a custom loader for a utility class for an Action 
class.  This is not working.  The utility tests fine off the net.  When I 
get it on the net and in Tomcat, it breaks.  The loader is for a hot 
deploy.  The following is the code.  Can anyone tell me why this 
breaks?  It returns a good Class object but when initializing a variable 
for Class with Tomcat and Struts, it throws a null pointer exception.  That 
is an odd thing, since nothing is null.  But, I suspect it must be because 
of some classloader conflict.  ANyone know?

The code for the classloading hot deploy factory is:

  public static synchronized ResourceRetriever 
createResourceRetriever(ResourceRetriever template) {
    if(resourceClass == null) {
      reloadImpl();
    }
    ResourceRetriever newResourceRetriever = null;
    try {
      newResourceRetriever = (ResourceRetriever)resourceClass.newInstance();
    } catch (InstantiationException ie) {
      LogFactory.getLog(ResourceRetriever.class).error(ie.getMessage());
    } catch (IllegalAccessException iae) {
      LogFactory.getLog(ResourceRetriever.class).error(iae.getMessage());
    }
    return newResourceRetriever;
  }

  public static synchronized void reloadImpl() {
    URL [] serverURLs = null;
    try {
      serverURLs = new URL[] { new URL("file:../hot_deploy/") };
    } catch (java.net.MalformedURLException mue) {
      LogFactory.getLog(ResourceRetriever.class).error(mue.getMessage());
    }
    classLoader = new URLClassLoader(serverURLs);
    try {
      resourceClass = 
classLoader.loadClass("com.michaelmcgrady.resource.ResourceRetrieverImpl");
    } catch (ClassNotFoundException cnfe) {
      LogFactory.getLog(ResourceRetriever.class).error(cnfe.getMessage());
    }

    return;
  }
Thanks.

Michael McGrady 



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