Stupid frameworks are forcing you to do stupid things

I am working with GWT+GXT right now. And I have strange problem - I can't save some user object. Just can't. When user logined to the system I want to save user object, containing his name, mail, role, group and other things. But as soon as F5 pressed - all static is cleared from the application, so even static fields can't help me. Cookies can help me, but they're limited to String only...

Of course my imagination works fine, and I can implement some GWT RPC service and get user from the server (where I have user's session, and I can save User object into that session). But it's stupid, isn't it?