什么可以用来代替会话来存储从liferay中的多个请求获得的变量

I am using liferay MVC. In the project I have a portlet which hits many different requests say render and request and gets some data from each requests. I am storing the same data in the session for the complete cycle , but if I opens a new tab in the browser the data gets messed up, The data from the recent request overlaps the previous data.I am using liferay MVC. In the project I have a