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From "Ted Kirby" <>
Subject Re: Property substitution in config.xml implemented
Date Mon, 05 Mar 2007 15:46:11 GMT
Yeah, this is a great extension to my paltry start... :)

Ted Kirby

On 3/3/07, David Jencks <> wrote:
> Following Ted Kirby's idea of property substitution in config.xml
> files (GERONIMO-2735) I applied and modified his patch.  Jason Dillon
> had a jexl expression evaluator lying around so I replace the
> evaluation code in the patch with the jexl stuff, so now you can use
> expressions in your substitutions.
> The substitutions are in a new file, default location var/config/
>  This is used to evaluate
> expressions in config.xml.  I implemented a small example in geronimo-
> jetty6-jee5 for the jetty connectors, using
> hostName
> httpPort
> httpsPort
> portOffset.
> You can override a value in the properties file with an environment
> variable or a system property.  Therefore, to start a server on a
> different set of jetty connector ports, you can say:
> java -DportOffset=1 -jar bin/server.jar --long

I particularly like how this elegantly addresses the multiple server
instances port numbering issues, to make it very easy to define
multiple server instances.  Just give a server name and port offset,
and you are set.  Now, if I can only locate where port 4200 is set...
(See my user posting here .)

Ted Kirby

> If this generally seems like a good idea and no one has a better idea
> I'll go through the config.xmls and use substitutions more
> systematically in a few days.
> One question I have is whether it's really a good idea to use
> environment variables for substitutions.  I really don't know and
> would appreciate more informed opinions.
> Also, you can specify an alternate properties file on the command
> line with
> java
> Many thanks to ted for coming up with the original patch and pushing
> for it.
> thanks
> david jencks

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