Session token usage error: java.lang.IllegalStateException: Context has not 
been prepared for next connection
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                 Key: WW-2902
                 URL: https://issues.apache.org/struts/browse/WW-2902
             Project: Struts 2
          Issue Type: Bug
          Components: Core Interceptors
    Affects Versions: 2.1.2
            Reporter: Sitaram Reddy


I have looked into the source code and found the reason. In 
TokenInterceptor.doIntercept(...), there is this code:

                Map session = ActionContext.getContext().getSession();

                synchronized (session) {
                        if (!TokenHelper.validToken()) {
                                return handleInvalidToken(invocation);
                        }

                        return handleValidToken(invocation);
                }
I found that the session Map is thread dependant and so the above block is 
essentially not synchronized! An previous bug WW-1786 also points out that the 
block is not synchronized - that fix would be redundant once this issue is 
resolved.

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