As you already know, one of the changes of the servlet 2.4 specification is that it uses XML schemas.
And with this new schema, there is not anymore a strict order for the top level elements in the web.xml file
So we can declare a servlet and then its mapping, and then a new servlet with its mapping
Something like that :
<servlet> ...servletA..</servlet> <servlet-mapping>..servletA...</servlet-mapping> <servlet> ...servletB..</servlet> <servlet-mapping>..servletB...</servlet-mapping>
But the mapping of a servlet can be declared before the declaration of the servlet element <servlet-mapping>..servletA...</servlet-mapping> <servlet> ...servletA..</servlet>
The problem is that this is a valid XML but it fails during the deployment on Tomcat 5. This is due to the fact that during the XML parsing, when we add a servlet mapping, there is a check to see if the servlet exists. Method addServletMapping() in org.apache.catalina.core.StandardContext class.
// Validate the proposed mapping
if (findChild(name) == null)
throw new IllegalArgumentException
(sm.getString("standardContext.servletMap.name", name));I agree that it is strange to do that (mapping between servlet declaration) and it can be a minor problem but it can occurs sometimes (during some copy/paste) So, maybe the check has to move to another place.
Regards,
Florent.
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