[Commons Configuration] How SubsetConfiguration works ?

[Pierre8rou]

Hello,


With this code :
---------------

package com.test.configuration;

import org.apache.commons.configuration.BaseConfiguration;
import org.apache.commons.configuration.SubsetConfiguration;

public class testCommonsConfig001 {

        public static void main(String[] args) {

                BaseConfiguration config = new BaseConfiguration();

                config.addProperty("prefix1.car01", 11.1);
                config.addProperty("prefix1.car02", 22.2);
                config.addProperty("prefix1.car03", 33.3);

                config.addProperty("prefix2.car01", 11.1);
                config.addProperty("prefix2.car02", 22.2);
                config.addProperty("prefix2.car03", 33.3);

                System.out.println(config.getDouble("prefix1.car01"));
                System.out.println(config.getDouble("prefix1.car02"));
                System.out.println(config.getDouble("prefix1.car03"));

                SubsetConfiguration subsetPre01 = new 
SubsetConfiguration(config,
                                "prefix1");

                System.out.println(subsetPre01.getDouble("car01"));

        }
}


I got this console message :
---------------------------

Exception in thread "main" java.util.NoSuchElementException: 'car01' doesn't
map to an existing object
        at
org.apache.commons.configuration.AbstractConfiguration.getDouble(AbstractConfiguration.java:734)
        at
com.test.configuration.testCommonsConfig001.main(testCommonsConfig001.java:30)


Why car01 does not exist ?

Thanks,

Pierre8r

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