New servlet from old

For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

Check list - how to modify a Servlet and install it under a new name on your Tomcat server. This scheme assumes that you're working at a machine that has Java installed, but doesn't have its own copy of Tomcat and all the extras (why would it - it's your development machine and not the server!)

1. Get hold of the source code you need to modify
2. Get servlet-api.jar
3. export CLASSPATH=.:servlet-api.jar
4. make source code changes
5. Compile the modified source
6. Upload the class file to the webapps/xxxx/WEB-INF/classes directory
7. Add a servlet mapping to the web.xml file in WEB-INF
8. Stop and restart the webapp via the Tomcat manager

(written 2005-10-28, updated 2006-06-05)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

J906 - Java - Servlets in More Detail
  [1495] Single login and single threaded models - Java and PHP - (2008-01-04)
  [1550] Java (JSP and Servlet examples) live on our server - (2008-02-23)
  [1909] javax.servlet cannot be resolved - how to solve - (2008-11-26)
  [2183] Servlet life cycle, and Java Servlet variable scope - (2009-05-16)
  [2652] Reading and writing cookies in Java Servlets and JSPs - (2010-02-26)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [3044] Changing a Servlet - more that just editing and compiling - (2010-11-12)
  [3293] Distributing the server load - yet ensuring that each user return to the same system (Apache httpd and Tomcat) - (2011-05-18)
  [4431] A Java servlet that is also a stand alone program. And a server that is also a web client. - (2015-02-19)
  [4432] Java web application for teaching - now with sessions and clustering / load balancing demonstrations - (2015-02-20)

A653 - Web Application Deployment - Tomcat - Configuring Web Applications
  [465] Changing Tomcat's web.xml and reloading a web application - (2005-10-15)
  [754] tar, jar, war, ear, sar files - (2006-06-10)
  [1006] Apache httpd and Apache Tomcat together tips - (2006-12-24)
  [1074] Java beans and classes, .war and .jar files - (2007-02-10)
  [1082] Straight from the .jar - (2007-02-16)
  [1192] What are WEB-INF and META-INF directories? - (2007-05-18)
  [1552] Extra public classes in deploying Apache httpd and Tomcat - (2008-02-24)
  [1564] Default file (MiMe types) for Apache httpd and Apache Tomcat - (2008-03-04)
  [2088] Changing the 404 - file not found - page in Tomcat - (2009-03-18)
  [3996] Tips on Tomcat - moving applications around - (2013-02-05)

A507 - Web Application Deployment - Java - Servlets and JSPs
  [2151] What is a JSP tag library? - (2009-05-01)
  [2525] Using JSPs, Tag Libraries, Java Beans, Tomcat in one short example - (2009-12-04)
  [3997] Servlet v JSP (Java Server Page). What is the difference? - (2013-02-06)

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Some other Articles

Double Dollars in PHP
Different ways of selling
PHP upgrade - traps to watch
New look to website
New servlet from old
Watch what you wear
Class, static and unbound variables
May I be politically incorrect?
Where to stay in and near Melksham
Vintage Bus Day

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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