"The value for the useBean class attribute user.UserData is invalid" - why?

Attempting to create a selection of webpages that take some information, and then display it on a later page, Works up to the retrieving and displaying stage, where I get the 开发者_JAVA百科following error,

The value for the useBean class attribute user.UserData is invalid

I am using the following tutorial: http://www.jsptut.com/Forms.jsp

I know there is probably 40 billion different questions aanswering this, but I literally picked up JSP at 9.13am this morning. So I need a tailormade answer!

I'm using Eclipse IDE and Tomcat 6.0.33

Thanks

P.S. Some google research keeps mentioning compile.class. Some mention they compiled the bean, but it thought JavaScript was a script meaning it didn't need to be compiled?

Rev: Right, so apparently, i need to compile the bean and then use JSP to execute it? Can anybody advise me on how to compile my Bean?

http://download.oracle.com/javase/tutorial/ is a good place to start. You might want to jump into http://download.oracle.com/javase/tutorial/getStarted/cupojava/win32.html. It's a step-by-step on how to write, compile and run using command-line tools and then work your way down the tutorial list.

When you're a little familiar with that, you can set yourself up with a good development environment, like netbeans or eclipse