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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