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From David Jencks <>
Subject Property substitution in config.xml implemented
Date Sun, 04 Mar 2007 04:47:30 GMT
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


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

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


Many thanks to ted for coming up with the original patch and pushing  
for it.

david jencks

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