more .o vs .class and classloaders

Thu Jun 12 20:06:00 GMT 2003

Is is possible to do something like this using pure machine code, not 
byte code. If I compile app.java and cl.java and leave the two Hello's 
as class files it works. How can I make them .o or .so without 
changing the java code. If I have to change the java code what changes 
need to be made?
app.java
class app
{
 public static void main(String[] args) {
 try {
 java.io.File file = new 
java.io.File("/opt/NetFuel.save/gcj/gcj-jvm/cl/v1/");
 ClassLoader cl1 = new cl(file.toURL());
 file = new 
java.io.File("/opt/NetFuel.save/gcj/gcj-jvm/cl/v2/");
 ClassLoader cl2 = new cl(file.toURL());
 Class Klass1 = cl1.loadClass("Hello");
 Class Klass2 = cl2.loadClass("Hello");
 String 
s1=(String)Klass1.getMethod("HelloString",null).invoke(null,null);
 String 
s2=(String)Klass2.getMethod("HelloString",null).invoke(null,null);
 System.out.println("String from class 1 " + s1 + "\n");
 System.out.println("String from class 2 " + s2 + "\n");
 } catch (Exception e) {
 System.out.println("ERROR \n\t" +e);
 }
 }
}
cl.java
class cl extends java.net.URLClassLoader
{
 cl(URL path){
 super (new URL[0]);
 try {
 addURL(path);
 } catch (Exception e) {
 System.out.println("Error in cl\n\t" +e );
 }
 }
}
v1/Hello.java
public class Hello
{
public static String HelloString() { return "V1 Hello";};
}
v2/Hello.java
public class Hello
{
public static String HelloString() { return "V2 Hello";};
}
-- 
Steve Pribyl
Steve AT NetFuel dot com
Computer Infrastructure Practitioner