Ajouter des classes au ClassPath en cours d'exécution

J'ais trouvé !

Cours et tutoriels Java : http://java.developpez.com/cours/

Code:

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import java.lang.reflect.*;
import java.io.*;
import java.net.*;
 
public class ClassPathHacker {
 
private static final Class[] parameters = new Class[]{URL.class};
 
public static void addFile(String s) throws IOException {
	File f = new File(s);
	addFile(f);
}//end method
 
public static void addFile(File f) throws IOException {
	addURL(f.toURL());
}//end method
 
 
public static void addURL(URL u) throws IOException {
 
	URLClassLoader sysloader = (URLClassLoader)ClassLoader.getSystemClassLoader();
	Class sysclass = URLClassLoader.class;
 
	try {
		Method method = sysclass.getDeclaredMethod("addURL",parameters);
		method.setAccessible(true);
		method.invoke(sysloader,new Object[]{ u });
	} catch (Throwable t) {
		t.printStackTrace();
		throw new IOException("Error, could not add URL to system classloader");
	}//end try catch
 
}//end method
 
}//end class

Usage :

Code:

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String classpath = "/chemin/monJar.jar";
ClassPathHacker.addFile(classpath);
clazz = Class.forName("monpackage.MaClassee");

Trop cool ... ;-)