在运行时将数据保存在服务器中的首选方法是什么

Question

I have a web application which has the UI having its requests handles by Struts Action class.

Lets say that the UI sends data for 30 variables at a single request. The action class process the request and stores the 30 variables in a java object.

I need to persist the data beyond the request scope (even after the server sends response back to client for that request received, the data has to be persisted), because i have another servlet which relies on this persisted data (those 30 variables updated through UI).

Ways to persistence:

1. Store it in DB
2. Use JPA
3. Use static variables.
4. Using MQ

Which among the above would you prefer? I guess the third option doesn't hold good.

Added Points to have a better clarity:

• The UI sends a request (holds around 30 String variable data) for every 1 minute. For every one min, the persisted data has to be modified.

• The another servlet which relies on this persisted data is no way
  related to the request, hence i believe the session context will not be shared.

Answer 1

Could you use an HttpSession ? You can put the data in a session, which keeps it stored on the server side, and then it's persisted across requests and available to other servlets.

Answer 2

Not enough information. It really depends on many different factors (what the app does, how much data, etc) which you haven't elaborated on. All of those approaches could be the correct one in a certain situation. Even the static variable option could be right in some bizarre case.