Hi,
I was going through the design of Pet Store Application, Blue Print
Application. In documents it says that the application uses Front
Controller Design pattern and all the requests are intercepted by
MainServlet. Mappings defined in the web.xml are like this
<servlet>
<servlet-name>webTierEntryPoint</servlet-name>
<display-name>HTML Client Front Controller Servlet</display-name>
<description>no description</description>
<servlet-class>com.sun.j2ee.blueprints.waf.controller.web.MainServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>webTierEntryPoint</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
As per my understanding all the requests ending with .do will be
intercepted by the MainServlet and it will further dispatches the
request to other components depending upon the mappings defined in
mapping.xml. However, the index.jsp page "Welcome Page" defined in the
web.xml has a link for enteing into the site.this link points to the
"http://localhost:7011/petstore/main.screen";, Though this link is not
ended with .do, then who is intercepting the requests. I tried finding
out into the mapping.xml file and i could see
<default-screen>main.screen</default-screen> and
<url-mapping url="changelocale.do" screen="main.screen" isAction="true">
<action-class>com.sun.j2ee.blueprints.waf.controller.web.action.actions.ChangeLocaleHTMLAction</action-class>
</url-mapping>
in mapping.xml. This finding even disturbed my earlier understanding
that MainServlet will be using this mapping.xml. Who is the user of this
mapping.xml, is this the container is managing the interactions and
second doubts is, is this mapping.xml is a part of the J2EE
specifications like (ejb-jar.xml) or it is framework specific like
(struts)
Thanks
Manoj
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