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https://issues.apache.org/jira/browse/CONFIGURATION-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774826#action_12774826
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Oliver Heger commented on CONFIGURATION-401:
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By converting the flat configuration to a hierarchical one a tree is
constructed, but in this case it has a different structure than you expect. It
looks like the following:
{noformat}
persons
person
name=1
name=4
name=7
surName=2
...
{noformat}
The problem is that a flat configuration format like a properties file simply
does not contain enough information about the internal structure of its
properties. So the algorithm that creates a hierarchical configuration from
this data has no information how it should combine certain properties (e.g. add
multiple _person_ elements instead of adding all data to a single _person_
element).
I don't think there is much we can do about this. An algorithm smart enough to
deal with this problem would really be complex - if it is feasable at all.
> HierarchicalConfiguration does not support hierarchy from property files
> -------------------------------------------------------------------------
>
> Key: CONFIGURATION-401
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-401
> Project: Commons Configuration
> Issue Type: Bug
> Components: Expression engine
> Affects Versions: 1.6
> Environment: windows/Linux
> Reporter: yair ogen
>
> If you have hierarchy like this:
> persons.person.name=1
> persons.person.surName=2
> persons.person.phoneNum=3
> persons.person.name=4
> persons.person.surName=5
> persons.person.phoneNum=6
> persons.person.name=7
> persons.person.surName=8
> persons.person.phoneNum=9
> If I have a regular property configuration that loaded a file containing in
> the above. then I transform into HierarchicalConfiguration using:
> ConfigurationUtils.convertToHierarchical(configuration).
> The tree is not right.
> I can do this:
> hierarchicalConfiguration.subset("persons").subset("person(0)").getKeys()
> but this returned empty iterator:
> hierarchicalConfiguration.subset("persons").subset("person(1)").getKeys()
> Only the first person is available.
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