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https://issues.apache.org/jira/browse/CONFIGURATION-295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oliver Heger resolved CONFIGURATION-295.
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Resolution: Fixed
A fix was committed. The value of the root node of the returned configuration
will now be set if possible.
There is one problem however: If the key that is passed to the subset() method
selects multiple nodes and more than one of these nodes has a value, the value
of the root node cannot be determined. This is because in this case multiple
source nodes have to be mapped to a single destination (the root) node. With
child and attribute nodes this is no problem because we can simple construct
the union. But for node values (which can be arbitrary objects) we cannot
decide how to merge this data.
I have mentioned this point in the Javadocs of the subset() method. Simple
cases, as the one in your example, should now work as expected.
Thank you for spotting this problem!
> HierarchicalConfiguration.subset(...) misses an entry with the key equal to
> the subset prefix.
> ----------------------------------------------------------------------------------------------
>
> Key: CONFIGURATION-295
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-295
> Project: Commons Configuration
> Issue Type: Bug
> Affects Versions: 1.4
> Environment: Commons configuration V1.4
> Loaded configuration: An ordinary commons config XML file referring to two
> property files.
> Reporter: Eduard Rindt
> Assignee: Oliver Heger
> Fix For: 1.5
>
>
> Having a HierarchicalConfiguration with entries alike:
> test.sample = subset title
> test.sample.boolean = true
> test.sample.int = 123456
> test.sample.text = I wish it worked!
> When performing subset("test.sample"), I get a configuration of only three
> entries, the "subset title" value is not present (should have an empty string
> key).
> The behaviour is in contradiction to Javadoc of the Configuration interface
> http://commons.apache.org/configuration/apidocs/org/apache/commons/configuration/Configuration.html#subset(java.lang.String)
> Seems to me, that the bug is hidden in iterating the cloned configuration,
> where only children of the clone are processed, but not the root itself.
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