SubnodeConfiguration.clear() does not work correctly
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Key: CONFIGURATION-458
URL: https://issues.apache.org/jira/browse/CONFIGURATION-458
Project: Commons Configuration
Issue Type: Bug
Affects Versions: 1.6
Reporter: Oliver Heger
If clear() is called on a SubnodeConfiguration obtained through the
configurationAt() method of HierarchicalConfiguration, the node structure of
the parent configuration (outside of the area of the sub configuration) may
also be manipulated. Properties added to the SubnodeConfiguration after a
clear() are not visible from the parent configuration.
The problem is caused by the implementation of the clear() method inherited
from AbstractConfiguration. This will call clearProperty() for each property
found in the configuration. clearProperty() in turn clears the value of nodes
and recursively clears the parent node if it does not contain any data. Here
the structure owned by the SubnodeConfiguration can be left so that the parent
gets manipulated.
A possible solution would be to provide a specific implementation of clear()
for hierarchical configurations. This could also be more efficient than the
base implementation.
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