[jira] [Commented] (CONFIGURATION-467) Unable to persist CombinedConfiguration changes to the Filesystem.

["Emmanuel Bourg (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CONFIGURATION-467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132650#comment-13132650 ] 

Emmanuel Bourg commented on CONFIGURATION-467:
----------------------------------------------

There is a proposal to add a save method to all configurations, that would cover your case (CONFIGURATION-311). In the meantime a solution is to enable the auto-save feature on your file based configurations:

{code}
<configuration>
  <header/>
  <override>
    <properties fileName="db.properties" autoSave="true"/>
    <properties fileName="jms.properties" autoSave="true"/>
    <xml fileName="gui.xml" autoSave="true"/>
  </override>
  <additional/>
</configuration>
{code}
                
> Unable to persist CombinedConfiguration changes to the Filesystem.
> ------------------------------------------------------------------
>
>                 Key: CONFIGURATION-467
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-467
>             Project: Commons Configuration
>          Issue Type: Bug
>          Components: File reloading
>    Affects Versions: 1.6
>         Environment: Linux java
>            Reporter: raghutpk
>              Labels: apache-commons-configuration, features, newbie
>             Fix For: 1.8
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> I use a config.xml file to load multiple Configuration Sources 
> Ex: 
> <configuration>
> <header/>
> <override>
> <properties fileName="db.properties"/>
> <properties fileName="jms.properties"/>
> <xml fileName="gui.xml"/>
> </override>
> <additional/>
> </configuration>
> I load the config.xml and subsequently all the properties in my app to a CombinedConfiguration Object as follows :
> DefaultConfigurationBuilder builder = new DefaultConfigurationBuilder();
> builder.setFile(new File("config.xml"));
> CombinedConfiguration combinedConfig = builder.getConfiguration(true);
> Now I am trying to expose all the properties from all configuration sources using a mbean and at runtime trying to update the Properties. I wouldn't know though, from which source the properties came from as the CombinedConfiguration takes care of that abstraction, but when I do the following it doesn't change the persistance store(in this case the files on the Filesystem).
> /*combinedConfig.setProperty(Key, updatedValue);*/
> There is no save method on the combinedConfiguration class so that the persistance store gets updated.
> There is a save method in PropertiesConfiguration class or XMLConfiguration class, but I wouldn't know at runtime or inside the code which file or configuration source the Key belongs to, so even If I add a config-name to each source there is no use. 
> SO wouldn't the setProperty help me update the value of the Configuration and persist it back to the original file. I don't know it is a bug or a feature it doesn't support or there is a workaround in such scenarios. 
> Please advice.

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