A few things to look at. First, do you have the web.xml file in the directory of myJSPapp? You need that file and the class folder to have JSP's run. Second, did you start tomcat after making any changes? Often, if you start Tomcat, work on your code, and then run your code, you get errors. Tomcat should be restarted if you are making any changes to beans.
If the two above reasons are not the problem, perhaps it is in the code. If you show us your code, I would be willing to help you find errors.