Dynamically load a jar at runtime

A short post but I figured I would throw it up here before I lose my code. There are a couple of different ways that you can load jar’d code at runtime but here is a simple solution that I found to work very easily.

       File myJar = new File("myJar.jar");
       URL url = myJar.toURI().toURL();

       Class[] parameters = new Class[]{URL.class};

        URLClassLoader sysLoader = (URLClassLoader)ClassLoader.getSystemClassLoader();
        Class sysClass = URLClassLoader.class;
            Method method = sysClass.getDeclaredMethod("addURL", parameters);
            method.invoke(sysLoader,new Object[]{ url });

            Constructor cs = ClassLoader.getSystemClassLoader().loadClass("com.example.MyClass").getConstructor(); 
            MyInterface instance = (MyInterface)cs.newInstance();
        catch(Exception ex)

In the code example above the jar at the location pointed to by the url object is dynamically loaded and an instance of the class com.example.MyClass is created that conforms to a known interface MyInterface. This could be used in a situation where you are loading plugins that use a common interface example.