[configuration] Defining variable resolvers in configuration definition files

[Oliver Heger <ol...@oliver-heger.de>]

Hi all,

currently I am working on [CONFIGURATION-518] - rework of interpolation 
features.

DefaultConfigurationBuilder supports that custom variable resolvers can 
be defined in its definition files. I noticed that these resolvers are 
not only used locally, but are also registered as global lookup objects. 
I think, this behavior is pretty invasive, and it does not seem to be 
documented (at least not in the Javadocs of 
DefaultConfigurationBuilder). This seems to be a workaround for making 
such custom resolvers available to other objects (e.g. 
ConfigurationInterpolator objects in DynamicCombinedConfiguration).

I temporarily disabled this mechanism (and had to @Ignore 4 test cases 
which now are failing). I hope to find a better solution based on the 
builders approach I am working on in parallel. In this context, I also 
plan to have a more generic mechanism to define default settings for 
newly created Configuration objects.

Oliver

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