Member Avatar for jeetudaljit

Pl. help to call a servlet page which is in another directory from a jsp page.

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  • Latest Post Latest Post by peter_budo

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Building on ’s reply: you don’t call a servlet by its physical directory. The container routes requests by URL patterns. Map the servlet to a clean path and have the JSP submit to that path. Also, avoid hardcoding the app name; generate the context path so it works no matter where the app is deployed.

Example mapping:

<!-- web.xml -->
<servlet>
  <servlet-name>Front</servlet-name>
  <servlet-class>com.example.web.FrontController</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>Front</servlet-name>
  <url-pattern>/front</url-pattern>
</servlet-mapping>

From the JSP, post to the mapped URL:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<form action="<c:url value='/front'/>" method="post">
  <!-- fields -->
</form>

Notes and gotchas:

  • Mapping a servlet to a path that looks like a JSP (e.g., something.jsp) is confusing and can clash with the JSP servlet. Prefer paths like /front or /controller/*.
  • The legacy /servlet/... invoker URL is container-specific and often disabled in production. Stick to explicit mappings.
  • If you want a server-side handoff from a JSP to a servlet in the same webapp (no new URL in the browser), forward instead of redirecting:
<%
  request.getRequestDispatcher("/front").forward(request, response);
%>
  • If the servlet lives in a different web application (different context), you cannot forward to it directly; use response.sendRedirect(...) to its public URL. Keep JSPs as views and put logic in servlets or controllers.
Member Avatar for peter_budo

If servlets are not mapped with use of web.xml you call it like this from the form for example

<form action="http://localhost:8080/PROJECT_NAME/servlet/SERVLET_NAME_NO_FILE_EXTENSION" method="POST">
YOUR FORM HERE
</form>

The web.xml mapping will look like this

<servlet>
       <servlet-name>SERVLET_NAME_YOU_WANT_TO_CALL_IT</servlet-name>
       <servlet-class>REAL_SERVLET_NAME_NO_FILE_EXTENSRION</servlet-class>
    </servlet>

    <servlet-mapping>
       <servlet-name>SERVLET_NAME_YOU_WANT_TO_CALL_IT</servlet-name>
       <url-pattern>/A_NAME.jsp</url-pattern>
    </servlet-mapping>

Example:
REAL_SERVLET_NAME_NO_FILE_EXTENSRION is FrontController
SERVLET_NAME_YOU_WANT_TO_CALL_IT I want to be Front
A_NAME.jsp I want to be front.jsp
to call my FrontController I will do following

<form action="front.jsp" method="POST">
FORM CODE HERE
</form>
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