Exercises, examples and other material relating to training module J901. This topic is presented on public courses Learning to Program in Java, Java Bootcamp, Java Programming for the Web

Web applications in Java can be provided by Servlet classes running in a container on a web server. In this module, you'll learn how to write simple servlets that allow web users (whether or not they have Java in their browser) to interact with your Java applications.

Sessions in Servlets

Articles and tips on this subject		updated
4432	Java web application for teaching - now with sessions and clustering / load balancing demonstrations I regret naming "latmjdemo" with that name when I prut together a web application for the Java version of our web deployemnt course. The nameing isn't random: • L - Linux, the operating system • A - Apache - the Apache httpd web server that's commonly used to front web sites • T - Tomcat ...	2015-02-19
3997	Servlet v JSP (Java Server Page). What is the difference? A servlet is a web program that generates output (normally HTML) and returns it to a browser. A JSP (Java Server Page) is a page of HTML ... with some extra bits of code where programatic elements are added as it's returned to the browser So on the surface, it looks like there's a fundamental difference. ...	2013-02-07
3044	Changing a Servlet - more that just editing and compiling If you're going to modify a servlet, you'll need to edit and recompile the classes that you're changing - and chances are that will include the main application class. Which means you need to have access to the source. Not a problem if you're a developer of the product, but could be an issue if it's ...	2010-11-12
2652	Reading and writing cookies in Java Servlets and JSPs Do you want to check (and perhaps set) cookies within a Java Servlet? I was looking around for good, straightforward examples today but found that most of the published code is only snippets rather than complete examples, or is over-complex for what should be a simple demo. First - do you really want ...	2010-02-26
1909	javax.servlet cannot be resolved - how to solve Two common problems in compiling Servlets for use within a Tomcat container ... PROBLEM: My Java Compile of a Servlet says "javax.servlet cannot be resolved" For example: [trainee@easterton sources]$ javac Smallest.java ---------- 1. ERROR in Smallest.java  (at line 2)    import javax.servlet.*;           ^^^^^^^^^^^^^ The import javax.servlet cannot be resolved ---------- 2. ERROR in Smallest.java  (at line 3)    import javax.servlet.http.*;           ^^^^^^^^^^^^^ The import javax.servlet cannot be resolved ---------- 3. ERROR in Smallest.java  (at line 5)    public class Smallest extends HttpServlet {                                  ^^^^^^^^^^^ HttpServlet cannot be resolved to a type ---------- 4. ERROR in Smallest.java  (at line 9)    public void doGet(HttpServletRequest request,                      ^^^^^^^^^^^^^^^^^^ HttpServletRequest cannot be resolved to a type ---------- 5. ERROR in Smallest.java  (at line 10)    HttpServletResponse response)    ^^^^^^^^^^^^^^^^^^^ HttpServletResponse cannot be resolved to a type ---------- 6. ERROR in Smallest.java  (at line 11)    throws IOException, ServletException                        ^^^^^^^^^^^^^^^^ ServletException cannot be resolved to a type ---------- 6 problems (6 errors)[trainee@easterton sources]$ SOLUTION: ...	2008-11-26

Lifeanswer.java	Basic Servlet - simple calculation and a visit counter
Maryland.java	Checking and setting cookies in a Servlet
Memo.java	Linking requests together via a session in a servlet
Noah.java	A simple servlet, and how to modify it
svl.html	Servlet demo - HTML form
svl_right.java	Servlet to read form and echo
symdyn.html	Dynamic operation of a Servlet