Beginner Assistance Sorely Needed

Question

I'm attempting to teach myself J2ME; having successfuly (or so I thought) installed the JDK 1.3, CLDC, MIDP and changed the various PATH variable, I decided to try and run a program.
I managed to successfully compile the program and generate a class file, however when I try to preverify this I'm presented with the following error every single time.
Error preverifying class Welcome
Class loading error: Illegal constant pool index
Any assistance to get me up and started would be extremely appreciated...

Answer 1

Good point :)
Ok let me start from the beginning. I'm currently working through the 'Core J2ME Technology & MIDP' book from Sun Microsystems.
I have downloaded the JDK (1.3.1.08) and CLDC and MIDP, and hopefully have installed these to the correct directories. Following directly from the book, I've ammended the PATH environment variable, the CLASSPATH Environment Variable and created a MIDP_HOME Environment variable according to the book.
My primative program consists of the following code, which was succesfully compiled but run into the error at preverify stage.
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class Welcome extends MIDlet implements CommandListener
private Display display;
TextBox tbMain;
private Command cmExit;
public Welcome()
display = Display.getDisplay(this);
cmExit = new Command("Exit", Command.SCREEN, 1);
tbMain = new TextBox("Welcome", "Core J2ME", 50, 0);
tbMain.addCommand(cmExit);
tbMain.setCommandListener(this);
public void startApp()
display.setCurrent(tbMain);
public void pauseApp()
public void destroyApp(boolean unconditional)
public void commandAction(Command c, Displayable s)
if (c==cmExit)
destroyApp(false);
notifyDestroyed();
Compiling the code correctly generates the CLASS file - Welcome.class, however when I try to preverify this I find the following error -
Error preverifying class Welcome
Class loading error: Illegal constant pool index
I've spent all day trying to sort the problem out, any help would be extremely grateful...