JspException: Undefined variable or class name

[Kelvin Tee]

I am using a servlet to call a jsp file (I am not using any beans). When I place a user-defined class in the code fragment section <% %> of the JSP file, it always throws me a JspException stating: Undefined variable or class name: <User-Defined class>. Am I doing something incorrect here? How come it cannot locate the user-defined class even though it is there?   Any solution/suggestion would be much appreciated.   Thanks