How can I achieve thread safe for context attributes?

[Vernon Wu]

I have an attribute stored in the servlet context scope. Various sessions can access 
it at any giving moment. It must be 
thread safe. How can achieve thread safe?

        CurrentUsers cs = (CurrentUsers)cxt.getAttribute(WebKeys.CurrentUsers);
        String user = (String)session.getAttribute(WebKeys.UserID);
        cs.remove(user); // or other modification
        cxt.setAttribute(WebKeys.CurrentUsers, cs);
 




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