I wondered how to add my own JSP files in Google app engine. I created my account in Google app engine. I don't know where to host my file and what is the url of my google appengine. Can anybody give me a simplified explanation?
As I understand it you do not upload JSP files, but rather complete WAR files. In any case here are the instructions for uploading your web application. Basically, you need to install their SDK and can then deploy using it (either from within Eclipse or via command line).
You may also want to read a bit about how to build your web project so that it will run under Google's app engine.