Servlets in Websphere - Please help!!!

Question

Can anybody please tell me this info
* Where exactly does Websphere start looking for servlet when url is typed and webpage requested.
* Any info you know about logs, error logs etc - where should I look for them in Websphere
* What kind of steps should be taken care of when upgrading Websphere
* Any book/ website u know that can tell me info about the above things - I just want more info/some basic info about internal stuff in Websphere - not what I see on the console.
Thanks in Advance.

Answer 1

* this is like with all J2EE compliant application servers defined in the web.xml. In that file, you define your servlets and a servlet mapping. This servlet mapping is the link between the URL-type and the servlet; eg:
<web-app id="WebApp_1">
<display-name>Example</display-name>
<description>Example servlet</description>
<servlet id="servletmapping">
<servlet-name>servletmapping</servlet-name>
<servlet-class>com.something.MyServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping id="examplemapping">
<servlet-name>servletmapping</servlet-name>
<url-pattern>*.myservlet</url-pattern>
</servlet-mapping>
</web-app>
* all logs are located in the ../Webspeher/AppServer/logs folder
* Upgrading websphere from?
* It speeks a bit for itself, the best website for this is www.ibm.com/websphere (you can also find some good docs for making j2ee applications using websphere on that url)