Re: empty interfaces via reflection

Aryeh M. Friedman wrote:


I did get the following to work. It uses a URLClassLoader, as Daniel
Pitts suggested. Your MyClassLoader didn't seem to be doing anything
extra, so you may as well use the existing class - though I don't see
why yours wouldn't work.

You give the directory containing the class to be tested as the first
argument, and it is turned into a URL for the class loader. Make sure
this directory is not in your classpath.

import java.io.*;
import java.net.*;

public class Test {
  public static void main(String[] args) throws Throwable {
    File f = new File(args[0]);
    URL[] path = new URL[] { f.toURI().toURL() };

    while (true) {
      ClassLoader loader = new URLClassLoader(path);
      Class klass = loader.loadClass("SomeClass");
      Object o = klass.newInstance();

      System.out.println(o.getClass().getDeclaredMethod("getAck").
                         invoke(o));
      System.in.read();
    }
  }
}

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