Struts redirect from model

I'm trying to implement a security model where the model of secured pages inherits from a SecureSupport. I don't know how or if I can redirect from a constructor, however. See below:

public class SecureSupport extends ActionSupport {
    private Map session;

    public SecureSupport  throws Exception
    {
        session = ActionContext.getContext().getSession();

        if(!session.containsKey("User"))
        {
            // redirect from here
        }
        return开发者_JS百科 SUCCESS;
    }

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Make your own exception (ie NoUserException) which has to be a run time exception. Then catch this exception with global exception handler, there you can redirect anywhere you want.