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https://issues.apache.org/jira/browse/CONFIGURATION-259?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oliver Heger resolved CONFIGURATION-259.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.4

Some hints were added to the JavaDocs of ConfigurationFactory and the user 
guide that recommend the usage of DefaultConfigurationBuilder instead.

Maybe in the 1.5 release ConfigurationFactory can be deprecated and then 
removed with the next major release (2.0).

> ConfigurationFactory Merge is broken
> ------------------------------------
>
>                 Key: CONFIGURATION-259
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-259
>             Project: Commons Configuration
>          Issue Type: Bug
>    Affects Versions: 1.3
>         Environment: Windows XP running Eclipse, JDK 1.4.2
>            Reporter: Karl Banke
>             Fix For: 1.4
>
>         Attachments: personendetails.xml, personensuche.xml, testconfig.xml, 
> TestConfiguration.java
>
>
> I am trying to merge two Configuration using the ConfigurationFactory and the 
> additional tag. It turns out that subsequent operations on the merged data 
> provide wrong results. In particular, after creating a particular subset from 
> a loaded configuration, the subset is empty. Strangely enough, when using 
> DefaultConfigurationBuilder to load exactly the same configurations this 
> works properly. 
> So when initializing the configuration as follows, I get the following error:
> URL configURL = getClass().getResource(configFile);
> ConfigurationFactory factory = new ConfigurationFactory();
> factory.setConfigurationURL(configURL);
> myConfig = factory.getConfiguration();
> 60043
> java.util.NoSuchElementException: 'HvNr' doesn't map to an existing object
>       at 
> org.apache.commons.configuration.AbstractConfiguration.getLong(AbstractConfiguration.java:743)
>       at 
> de.awd.vertriebsportal.portal.person.TestConfiguration.main(TestConfiguration.java:84)
> Exception in thread "main" 
> But when initializing it like this everything works properly
> DefaultConfigurationBuilder builder = new DefaultConfigurationBuilder();
>             builder.setURL(configURL);
>             myConfig = builder.getConfiguration();
> 60043
> 54564
> I will attach full source code and xml files

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