Servlet chaining - simple example
I see a strange issue in a simple servlet chaining example that I am trying:
Servlet 1:
public class gatewayservlet extends HttpServlet {
public void doPost(HttpServletRequest request ,
HttpServletResponse response)
throws ServletException , IOException {
doGet(request,response);
}
public void doGet(HttpServletRequest request ,
HttpServletResponse response)
throws ServletException , IOException {
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
name = request.getParameter("name");
RequestDispatcher rd = getServletConfig().getServletContext().getRequestDispatcher("/justServlets/secondservlet");
if(name!=null) {
request.setAttribute("UserName",name);
rd.forward(request , response);
// Forward the value to another Secondservlet
} else {
response.sendError(response.SC_BAD_REQUEST,
"UserName Required");
}
}
}
Servlet 2:
public class secondservlet extends HttpServlet {
public void doGet(HttpServletRequest request ,
HttpServletResponse response)
throws ServletException , IOException {
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
String UserName = (String)request.getAttribute("UserName");
out.println("The UserName is "+ UserName);
}
public void doPost(HttpServletRequest request ,
HttpServletResponse response)
throws ServletException , IOException {
doGet(request,response);
}
}
And the invoking form:
<html>
<body>
<FORM ACTION="/justServlets/gateway" METHOD=POST>
<P>Please Fill the Registration Form</p><br>
Enter Your Name<input type="text" name="name"><br>
<input type="submit" value="send">
</FORM>
</body>
</html>
The 'POST' gives a 405(Method not allowed) error. However ,invoking the first servlet as ..../justServlets/gateway?name=Socrates works. Whats the matter?
Answer
Assuming that /justServlets is the context path of your webapp, the code which forwards should use /secondservlet and not /justServlets/secondservlet, because, as the javadoc says:
The pathname must begin with a / and is interpreted as relative to the current context root.
(emphasis mine)
As it is, you're forwarding to /justServlets/justServlets/secondservlet, which probably doesn't exist.