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https://issues.apache.org/jira/browse/CONFIGURATION-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520101#comment-14520101
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Oliver Heger commented on CONFIGURATION-599:
--------------------------------------------
Are you sure you are using the correct node combiner for your use case?
{{MergeCombiner}} implements some pretty special merging rules; have a look at
the Javadocs at
http://commons.apache.org/proper/commons-configuration/apidocs/org/apache/commons/configuration2/tree/MergeCombiner.html.
Try UnionCombiner; this class always generates a union of the configurations
involved. Examples for the different combiners can be found in the user's
guide:
http://commons.apache.org/proper/commons-configuration/userguide/howto_combinedconfiguration.html#Node_combiners
> CombinedConfiguration fails to merge correctly when one configuration only
> contains one property
> ------------------------------------------------------------------------------------------------
>
> Key: CONFIGURATION-599
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-599
> Project: Commons Configuration
> Issue Type: Bug
> Affects Versions: 1.9
> Reporter: Martin Lindgren
> Priority: Critical
>
> When using a CombinedConfiguration it fails to merge properties located in
> both of the configurations if one of the configuration only contains 1
> property.
> {code:title=CombinedConfiguration.java|borderStyle=solid}
> public static void main(String[] args)
> {
> NodeCombiner combiner = new MergeCombiner();
> combiner.addListNode("module");
> CombinedConfiguration configuration = new
> CombinedConfiguration(combiner);
>
> XMLConfiguration xmlConf = new XMLConfiguration();
> xmlConf.addProperty("modules.module", "1");
> xmlConf.addProperty("modules.module", "2");
> xmlConf.addProperty("modules.module", "3");
>
> XMLConfiguration xmlConf2 = new XMLConfiguration();
> xmlConf2.addProperty("modules.module", "4");
> configuration.addConfiguration(xmlConf);
> configuration.addConfiguration(xmlConf2);
>
> //THIS WILL NOT PRINT THE VALUE 4 FROM XMLCONF2
> for(String s : configuration.getStringArray("modules.module"))
> {
> System.out.println(s);
> }
>
> System.out.println();
> //Now add one more additional property
> xmlConf2.addProperty("modules.module", "5");
>
> //NOW IT WILL PRINT BOTH VALUE 4 AND 5 FROM XMLCONF2
> for(String s : configuration.getStringArray("modules.module"))
> {
> System.out.println(s);
> }
> }
> {code}
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