B4J Question Passing data between web server handles


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I am writing a b4j server program that incorporates several handlers. Some data e.g. user names or date filters must be passed on to other handlers. I am looking for a method that allows me to do so without violating re-entrancy rules. Declaring them as globals in the main seems to be out of question when more than one user is logged in to the server concurrently. Has someone a reasonable method to do so?