[servlets] java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed

You should add return statement while you are forwarding or redirecting the flow.

Example:

if forwardind,

    request.getRequestDispatcher("/abs.jsp").forward(request, response);
    return;

if redirecting,

    response.sendRedirect(roundTripURI);
    return;

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java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed