Question

I want to use java platform and I don’t know what else I need to know about to write apps in google app engine?

Answer 1

According to this introduction, you’ll need at least the following (assuming you already know Java):

• the general concepts of standard Java web development (e.g. servlets, war files, JSP, session, request/response, etc)
• the JDO persistence framework (Java Data Objects)
• using the Eclipse IDE and the GAE plugin

However, rather than asking about skills, you’ll be better off to work through the tutorial, and identify areas that you don’t understand.