Exception « Response « JSP-Servlet Q&A

1. Servlet Exception - getOutputStream() has already been called for this response    stackoverflow.com

In my servlet an exeception thrown as org.apache.jasper.JasperException: java.lang.IllegalStateException: getOutputStream() has already been called for this response help me to resolve this problem thanks in advance

2. Why does response.getWriter() throw a checked exception?    stackoverflow.com

How would an IOException be thrown in below code ? Is it if the response object times out ?

public void doGet(HttpServletRequest request, HttpServletResponse response) {

3. response already committed exception when calls to one of my servlet    coderanch.com

String email = request.getParameter("email"); String password = request.getParameter("password"); String firstName = request.getParameter("firstName"); String lastName = request.getParameter("lastName"); String tempAge = request.getParameter("age"); HttpSession session = request.getSession(); int age = 0; try{ age = Integer.parseInt(tempAge); }catch (NumberFormatException e) { request.setAttribute("errorAge", "Invalid Age"); request.getRequestDispatcher("RegisterCustomer.jsp").forward(request, response); } if(email.isEmpty() || password.isEmpty() || firstName.isEmpty() || lastName.isEmpty()){ request.setAttribute("errorNull", "Please file all fields"); request.getRequestDispatcher("RegisterCustomer.jsp").forward(request, response); } Customer customer = new ...