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Java beans and classes, .war and .jar files

A Java Bean is a class that includes a constructor that takes no parameters, and getter and setter methods with names like getLength and setLength to read and write properties. So at a basic (Java) level, a bean is just a class that happens to conform to some conventions. However - when you come to tag libraries such as those used in Java Server Pages (JSPs), the convention becomes a mandatory rule that must be applied to make the class usable in this way.

A .war file (Web Archive file) is a .jar (Java Archive file) that includes a welcome file such as index.html at the top level of the tree, and a subdirectory WEB-INF that contains a web.xml file. So at a basic level, a .war file is just a .jar file that happens to conform to some conventions. However - when you come to deploying web applications in a container vehicle such as Tomcat, the conventions become mandatory rules that much be followed if the web application is to deploy correctly.
(written 2007-02-10)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A653 - Web Application Deployment - Tomcat - Configuring Web Applications
  [3996] Tips on Tomcat - moving applications around - (2013-02-05)
  [3044] Changing a Servlet - more that just editing and compiling - (2010-11-12)
  [2088] Changing the 404 - file not found - page in Tomcat - (2009-03-18)
  [1909] javax.servlet cannot be resolved - how to solve - (2008-11-26)
  [1564] Default file (MiMe types) for Apache httpd and Apache Tomcat - (2008-03-04)
  [1552] Extra public classes in deploying Apache httpd and Tomcat - (2008-02-24)
  [1192] What are WEB-INF and META-INF directories? - (2007-05-18)
  [1082] Straight from the .jar - (2007-02-16)
  [1006] Apache httpd and Apache Tomcat together tips - (2006-12-24)
  [754] tar, jar, war, ear, sar files - (2006-06-10)
  [479] New servlet from old - (2005-10-28)
  [465] Changing Tomcat's web.xml and reloading a web application - (2005-10-15)

J812 - Java Beans
  [3046] Java Beans, tag libraries and JSPs - what and why. - (2010-11-13)
  [2155] No subject or title? - (2009-05-03)


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