How to make a java web application fully stateless [duplicate]

Answer 1

The most simple way is to store the session information in some key-value store. Have a look here: Tomcat: Store session in database

To go "real" stateless, there must be NO session at all. This means: The user will authenticate with every request, and with every request you've got to check the credentials. (It's pretty similar to a session database)

Answer 2

You don't store any client state information on the server, you pass it around to everywhere that needs it and you pass it back to the client when the server needs something changed. That is what stateless means, no state. The server should not have any clue about what state the client is in until the client tells it what the state is.