class loader problems!

[alacn]

                    	
URLClassLoader classLoader2;
String jarName = "test.jar";
String className = "test";
URL[] appletURL = { new URL(base + "/" + jarName) };

classLoader2 = new URLClassLoader(appletURL);
Class loader = classLoader2.loadClass(className);
applet = (appletClass) loader.newInstance(); //line 177

im trying to load a class from a URL but when i try to load the class i get an error at compile time saying

Exception in thread "main" java.lang.ClassCastException: loader cannot be cast to gui.Gui$appletClass
at line 177


i had this working before when i just declared applet from the Applet class,
(such as Applet applet) but then i decided to improve the code so i could make use of the .init() method etc so i made a class which extends applet

        public class appletClass extends Applet implements AppletStub{

            @Override public void init() {

and then put the class loader code in the init() method and now im getting this error.


so for some reason changing applet declaration from Applet applet to appletClass applet = new appletClass(); has made it not work.

please help

[JosAH]

You don't have a class loader problem; it's just a simple Java syntax or semantic problem. A cast operator binds more tightly than an object dereference, so:

applet = (appletClass) (loader.newInstance());

kind regards,

Jos

[alacn]

heres the code working before before modifications. ive also included the rest of method such as the catches etc which are present aswell in the modifications.
however i think its clumsy because i got an initApplet method and then applet.init() inside of it hence why i modified it

	private void initApplet() {

		try {
                       URLClassLoader classLoader2;
                    	String jarName = "test.jar";
                        String className = "test";
			URL[] appletURL = { new URL(base + "/" + jarName) };

			classLoader2 = new URLClassLoader(appletURL);
			Class loader = classLoader2.loadClass(className);
			applet = (Applet) loader.newInstance();
			applet.setStub(this);
                        applet.addMouseListener(this);
			applet.init();
			applet.start();
		} catch (InstantiationException ex) {
			Logger.getLogger(Gui.class.getName()).log(Level.SEVERE, null, ex);
		} catch (IllegalAccessException ex) {
			Logger.getLogger(Gui.class.getName()).log(Level.SEVERE, null, ex);
		} catch (ClassNotFoundException ex) {
			Logger.getLogger(Gui.class.getName()).log(Level.SEVERE, null, ex);
		} catch (MalformedURLException ex) {
			Logger.getLogger(Gui.class.getName()).log(Level.SEVERE, null, ex);
		}
	}

[alacn]

You don't have a class loader problem; it's just a simple Java syntax or semantic problem. A cast operator binds more tightly than an object dereference, so:

applet = (appletClass) (loader.newInstance());

kind regards,

Jos

OK ill try that, thanks

[alacn]

You don't have a class loader problem; it's just a simple Java syntax or semantic problem. A cast operator binds more tightly than an object dereference, so:

applet = (appletClass) (loader.newInstance());

kind regards,

Jos

sorry still getting same error.

[alacn]

maybe it to do with the fact that previous i declared applet as

Applet applet;

and now its being declared as

appletClass applet = new appletClass();

ie because the applet is being set to a new object it doesnt allow it to load a class into it?

[Norm]

Can you reduce your code to the smallest that will generate the error?
Your small pieces from here and there don't show enough to work on.
My quick test program compiles with no errors. There must be something else in your code that's the problem.