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Richárd,
On 1/24/18 4:31 PM, Richárd Olivér Legéndi wrote:
> Yaaaay! I'm sending a tech mail to an open source community after
> years! You can't believe what a relief it is :-)
Welcome to the community!
> Anyway, I would like to ask your help about some config topic.
>
> I would need the following configuration *only *for my webapp:
>
> <servlet> <servlet-name>jsp</servlet-name>
> <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
>
>
<init-param>
> <param-name>mappedfile</param-name>
> <param-value>false</param-value> </init-param> <init-param>
> <param-name>trimSpaces</param-name>
> <param-value>true</param-value> </init-param>
> <load-on-startup>3</load-on-startup></servlet>
>
> So far I thought this is a setting which is global for Tomcat
> (i.e., it can only be configured in Tomcat's *web.xml*). This is
> something I am not allowed to do, because the Tomcat has other apps
> too.
>
> I have made some experiments and for me it seems when I run the app
> locally on my developer machine these settings take place even when
> it is only in the *web.xml* of my own application.
>
> Could someone enlighten me what is the exact mechanism here?
When Tomcat deploys your context ("webapp"), it merges the global
conf/web.xml and the application's WEB-INF/web.xml with the
application's configuration overriding anything in the global
configuration. Therefore, if you replace the "jsp" servlet
configuration in WEB-INF/web.xml, it will (a) work and (b) only affect
that single application.
> The docs <http://www2.hu-berlin.de/newlogic/docs/jasper-howto.html>
> also say *"The servlet which implements Jasper is configured using
> init parameters in your global $CATALINA_BASE/conf/web.xml"* so I'm
> confused if this is an expected behaviour, only a "developer
> setting" or it could work in a more restrictive production
> environment too. What I can think of is that the servlet generator
> has different contexts for all the applications, and if there is no
> specific setting then it inherits the one defined in the global
> *web.xml*.
You can also use <init-param> in WEB-INF/web.xml for the JSP servlet.
You will probably have to copy those settings you want from the JSP
configuration in conf/web.xml because I don't think Tomcat will merge
init-param between the two files.
Hope that helps,
- -chris
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