Load external .jar into Servlet

Hi...
I'm trying to load an external jar file into a Servlet and I'm getting some problems.
I'm using URLClassLoader to get the class from the jar, but, everytime I try to get a parametrized constructor from the class (as shown below), a NoSuchMethodException is thrown.
I can do that by a external Java Application, but not inside Servlet.
        try{
            constructor = clss.getConstructor(CoopServerInterface.class);
        } catch(NoSuchMethodException ex){
            ex.printStackTrace();
        }Could anyone help me?
Thanks!
Edited by: Jaumzera on Aug 1, 2008 11:22 AM

Show us the exception.
Does the class in question have a constructor that takes a CoopServerInterface parameter? I.e.
WhateverClassTheClssVariableIs(CoopServerInterface x) {
}If the constructor exists, have you deployed that version of the compiled code to your web server? Check that you have. Chances are you have an old WhateverClassTheClssVariableIs.class file somewhere that doesn't have the constructor, and the web server is using that class file. Or you need to restart the web server so it notices the new version.

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