Incomplete interpolation in CompositeConfiguration.getList()
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Key: CONFIGURATION-233
URL: http://issues.apache.org/jira/browse/CONFIGURATION-233
Project: Commons Configuration
Issue Type: Bug
Affects Versions: 1.3 Final
Environment: Any.
Reporter: Rainer Jung
Interpolsation is mostly done by AbstractConfiguration. All classes that
override get methods of AbstractConfiguration need to be careful not to break
interpolsation.
The class CompositeConfiguration overrides getList() to easily chain the
results of getList for its subconfigurations. The calls to getList() in the
subconfigurations does interpolsation but only inside the subconfiguration. The
combined lists never get interpolated in the whole CompositeConfiguration. So
whenever a reference in the value refers to a property in another
subconfiguration, interpolation breaks.
Since all the scalar get methods correctly interpolate between different sub
configurations, I assume, that this special behavior in getList() is not
intended.
A simple test case would be using the ConfigurationFactory with a config.xml,
that uses two property files x.properties:
x.1=a
x.2=b
and y.properties:
y=${x.1}, ${x.2}
and then calling getList for the key "y".
The attached patch fixes the problem locally in CompositeConfiguration. It's
not very elegant, but tries to keep the fix local.
The patch should work for 1.2, 1.3 and trunk, since getList() in
CompositeConfiguration ist the same in these versions.
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