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From "Bill Barker" <wbar...@wilshire.com>
Subject Re: ${user.home} and other server.xml tags accepted by Tomcat?
Date Mon, 29 Sep 2008 01:37:10 GMT
As Konstantin has already pointed out, any value that you can get from 
System.getProperty("...") will be used for substitution.  And to expand on 
Rainer's comment, these are available for substitution in web.xml as well. 
This is a Tomcat-specific feature, so limits your ability to port to other 
containers.  There is currently no support for ${ENV.xxx},  it needs to be a 
Java property, not just an env variable.


"Maxim Veksler" <maxim.veksler@gmail.com> wrote in message 
news:b400c69a0809280848k4c588fa5v9353cfe1819f9bd1@mail.gmail.com...
> On Sun, Sep 28, 2008 at 2:37 PM, Rainer Jung <rainer.jung@kippdata.de> 
> wrote:
>> Maxim Veksler schrieb:
>>> Hello list,
>>>
>>> I'm looking for a way to make my tomcat configuration more dynamic
>>> without resorting to editing xm files. I considering doing this by
>>> using parameter substitution.
>>> I've seen from the SSL guide that tomcat will accept configurations
>>> like """${user.home}""".
>>>
>>> Is there a list, or a known set of these options that tomcat will
>>> read? Getting at least a reference to the cataline_home will be very
>>> helpful.
>>>
>>>
>>> p.s.
>>> I know from ant files that you can do ${env.SOMEVAL} to get the
>>> environment, sadly this does not work here. Is there an equivalent
>>> alternative ?
>>
>> The answer depends on the exact version you are using. All version 5.5
>> and 6 Tomcats and recent version 4.1 Tomcat supports resolving
>> ${somevariable} in server.xml by looking at system properties 
>> automatically.
>>
>> Some properties are set during Tomcat startup, like catalina.home and
>> catalina.base. Others you can set yourself by either adding to the
>> commandline "-Dsomevariable=somevalue" or adding to the end of
>> conf/catalina.properties.
>>
>> Not all config files aloow this. I think catalina.properties itself does
>> only allow for catalina.home and catalina.base and not general system
>> properties, log4j.properties allows general system properties, I'm not
>> sure about context.xml and web.xml at the moment (you could try).
>>
>> Be careful: system properties work, environment variables not. System
>> properties are often seen as a java equivalent of environment variables,
>> although those exist in java too.
>>
>> A common practise in a farms would be, to determine parts of the ports
>> to bind to in a startup script and to set them in server.xml by using
>> system properties, so the server.xml file in the whole farm can be kept
>> identical.
>>
>
> Hello Rainer,
>
> Thank you for the excellent pointers.
>
>
> Are you perhaps familiar with a programmatic / configurable method to
> output putting the full list of properties recognized by tomcat during
> Catalina start up ?
>
>
> Thank you,
> Maxim.
>
>> Regards,
>>
>> Rainer
>>
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>>
>
>
>
> -- 
> Cheers,
> Maxim Veksler
>
> "Free as in Freedom" - Do u GNU ?
>
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> 




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