On Thu, 3 Nov 2005 08:07:42 -0000, "John Smith"
<usenet123@ntlworld.com> wrote, quoted or indirectly quoted someone
who said :

see http://mindprod.com/jgloss/classloader.html

In Windows do somehting like:

C:>java -jar C:\path\to\file.jar

or:

C:>path C:\path\to
C:>java -jar file.jar

Of course, you will need to make minor (\ -> : etc.) if you're on a
different OS.

DS

Hi,

here is an example:

 static void urlcl() throws Exception {
   URL[] urls = new URL[] {
       new File("C:\\global_libs\\somejar.jar").toURL(),
   };

   URLClassLoader urlCL = new URLClassLoader(urls);
   Class clazz = Class.forName("com.somepackage.CustomStringBuffer",
true, urlCL);
   Object instance = clazz.newInstance();
   System.out.println("toString : " + instance.toString());
   System.out.println("hashCode : " + instance.hashCode());

   Method meth = clazz.getMethod("append", new Class[]
{String.class});
   meth.invoke(instance, new String[] {"test"});

   meth = clazz.getMethod("sendBuffer", new Class[] {Writer.class});
   Writer pw = new PrintWriter(System.out);
   meth.invoke(instance, new Writer[] {pw});
 }

 The best strategy however is to cast the returned instance to some
interface. This allows for re-loading of classes as soon as there is a
new JAR version (you can monitor for JAR file change).
Have a look at the Javadoc of java.net.URLClassLoader.
HTH,
chris