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From Rainer Jung <>
Subject Re: ${user.home} and other server.xml tags accepted by Tomcat?
Date Sun, 28 Sep 2008 21:46:22 GMT
Maxim Veksler schrieb:
> On Sun, Sep 28, 2008 at 2:37 PM, Rainer Jung <> wrote:
>> Maxim Veksler schrieb:
>>> Hello list,
>>> I'm looking for a way to make my tomcat configuration more dynamic
>>> without resorting to editing xm files. I considering doing this by
>>> using parameter substitution.
>>> I've seen from the SSL guide that tomcat will accept configurations
>>> like """${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/
>> Not all config files aloow this. I think itself does
>> only allow for catalina.home and catalina.base and not general system
>> 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 ?

Not sure I understand what you mean by "properties recognized by tomcat
during startup"?



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