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Date: Wed, 16 Sep 2009 21:48:52 +0200
From: Oliver Heger <oliver.heger@oliver-heger.de>
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To: Commons Users List <user@commons.apache.org>
Subject: Re: [CONFIGURATION] Help with optional XML file in override section
 of configuration builder.
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Ralph Goers schrieb:
> 
> On Sep 16, 2009, at 4:37 AM, Martin Ritchie wrote:
> 
>>
>> Oliver,
>> Thanks for the pointer to use DefaultConfigurationBuilder.
>>
>> Whilst this now does not need to have the test.config property defined
>> or the file existing it does behave differently to the older
>> ConfigurationFactory.
>>
>> With the configuration as shown in the pastie
>> (http://pastie.org/617143) the ConfigurationFactory builds a single
>> configuration tree where later elements are overwritten by newer
>> values.
>> So given the configuration values shown here: http://pastie.org/618625
>> The value of tests.store.class in config.xml (MemoryMessageStore) is
>> overwritten with (SlowMessageStore) from the test.config. The
>> additional values in the test.config are also propgated in to the
>> final configuraiton.
>>
>> When I changed to use the DefaultConfigurationBuilder the entire
>> virtualhosts section was overwritten as a result the other virtualhost
>> sections in config.xml were lost.
>>
>> Is there a way I can get the behaviour as seen with the
>> ConfigurationFactory but have the file parsing/loading of the
>> DefaultConfigurationBuilder?
>>
> What you are experiencing is probably a result of the NodeCombiner being 
> used. In trunk you will find a "MergeCombiner" that may behave the way 
> you want it to. If you build trunk you should look at the updated 
> documentation as it provides some documentation on how the 3 combiners 
> work and what results they will produce in various situations.
> 
> Ralph
> 

The problem may also be related to the handling of list nodes. [1] 
contains a discussion about NodeCombiners used when constructing a 
combined configuration (which is done under the hood by 
DefaultConfigurationBuilder). It also mentions possible problems when 
dealing with list structures.

In the description of the configuration definition file for 
DefaultConfigurationBuilder [2] it is explained how list nodes can be 
specified.

Oliver


[1] 
http://commons.apache.org/configuration/userguide/howto_combinedconfiguration.html#Node%20combiners

[2] 
http://commons.apache.org/configuration/userguide/howto_configurationbuilder.html#Enhancements_of_the_configuration_definition_file

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