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Subject: Variable interpolation in composite configuration
Date: Thu, 30 Nov 2006 11:22:17 +0100
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Thread-Topic: Variable interpolation in composite configuration
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From: "MASTRELLA STEFANO" <smastrella@sogei.it>
To: "Jakarta Commons Users List" <commons-user@jakarta.apache.org>
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Hi everybody,

What I need to is to reference some key in a configuration file from
another config file.
As an example cosider to have this configuration file for the
CompositeConfiguration


**********************composite-config.xml**********************

<?xml version=3D"1.0" encoding=3D"ISO-8859-1" ?>

<configuration>
  <properties fileName=3D"config1.properties"/>
  <xml fileName=3D"config2.xml"/>
</configuration>

and the following configuration file specified above

**********************config1.properties**********************
key1.property=3D1

********************** config2.xml **********************

<conf>
   <value name=3D"${key1.property }"/>
</conf>

As the CompositeConfiguration load first the cofig1.properties when I
try to look for the key "value[@name]" or "value/@name" (xpath version)
with this snippet of code


ConfigurationFactory factory =3D new ConfigurationFactory();

URL configURL =3D new File("config-composite.xml").toURL();

factory.setConfigurationURL(configURL);

Configuration config =3D factory.getConfiguration();

String prop =3D config.getString("value[@name]");


I'd expected to see the value "1" as defined in config.properties,
instead of ${key1.property}.

Is there any mistakes in what I thought?
There's something more to do for variable interpolation?

TIA

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