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compiling servlet


I was reading as below (http://www.javatpoint.com/steps-to-create-a-servlet-using-tomcat-server)

3)Compile the servlet

For compiling the Servlet, jar file is required to be loaded. Different Servers provide different jar files:
Jar file      Server
1) servlet-api.jar      Apache Tomacat
2) weblogic.jar      Weblogic
3) javaee.jar      Glassfish
4) javaee.jar      JBoss

I wonder why different servers provides different jars for compiling servlet rather than supplying single jar.

Please advise
Any links resources ideas highly appreciated. Thanks in advance
1 Solution
mccarlIT Business Systems Analyst / Software DeveloperCommented:
While they are different JAR's with different names, the core servlet classes/interfaces (eg. javax.servlet.Servlet, javax.servlet.http.HttpServletRequest, etc) that you use in your code would all be defined in exactly the same way within those different JAR's. They might have extra classes in them that are specific to the different servers, but that wouldn't affect how your code is compiled.

Also, when compiling code, nothing from any of those JAR's that you compile against gets "included" into your compiled code. They are just required to get the definitions of those standard Servlet classes/interfaces. So theoretically, you could, for example, compile your servlet code against the Tomcat servlet-api.jar but then still deploy and run your code on one of those other servers.
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