property replacement in WEB-INF/web.xml

["André Warnier (tomcat)" <aw...@ice-sa.com>]

Hi gurus.

Under tomcat 8 and Linux, I am deploying an externally-provided web application, which in 
its web.xml configuration file, has a parameter like this :

	<init-param>
	  <param-name>logroot</param-name>
	  <param-value>/var/log/tomcat8</param-value>
	</init-param>

This works, but I would like to make this more "generic", and would like to replace the 
above param-value by something like this :

	<init-param>
           <param-name>logroot</param-name>
           <param-value>${CATALINA_BASE}/logs</param-value>
         </init-param>

with CATALINA_BASE being the well-known environment value set prior to starting (the JVM 
which runs) Tomcat (and "${CATALINA_BASE}/logs" being actually a link which points to 
"/var/log/tomcat8" in this case).

Can I do this ? and if yes, what is the exact way to do this right ?

(In a log4j configuration file, I can use "${env:CATALINA_BASE}" for this, but this is not 
available under Tomcat, or is it ?)


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Re: property replacement in WEB-INF/web.xml

[Christopher Schultz <ch...@christopherschultz.net>]

André,

On 1/13/16 9:36 AM, André Warnier (tomcat) wrote:
> Hi gurus.
> 
> Under tomcat 8 and Linux, I am deploying an externally-provided web
> application, which in its web.xml configuration file, has a parameter
> like this :
> 
>     <init-param>
>       <param-name>logroot</param-name>
>       <param-value>/var/log/tomcat8</param-value>
>     </init-param>
> 
> This works, but I would like to make this more "generic", and would like
> to replace the above param-value by something like this :
> 
>     <init-param>
>           <param-name>logroot</param-name>
>           <param-value>${CATALINA_BASE}/logs</param-value>
>         </init-param>
> 
> with CATALINA_BASE being the well-known environment value set prior to
> starting (the JVM which runs) Tomcat (and "${CATALINA_BASE}/logs" being
> actually a link which points to "/var/log/tomcat8" in this case).
> 
> Can I do this ? and if yes, what is the exact way to do this right ?
> 
> (In a log4j configuration file, I can use "${env:CATALINA_BASE}" for
> this, but this is not available under Tomcat, or is it ?)

I think you want to use the system property version of that value, which is:

<init-param>
  <param-name>logroot</param-name>
  <param-value}${catalina.base}/logs</param-value>
</init-parm>

I can't find it in the Tomcat documentation that this will work in a web
application's web.xml, but that's definitely how it works for server.xml

-chris

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