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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CONFIGURATION-452) HierarchicalConfiguration with XPathExpressionEngine does not work when setting a new property
Date Sun, 19 Jun 2011 19:47:47 GMT

    [ https://issues.apache.org/jira/browse/CONFIGURATION-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051726#comment-13051726
] 

Oliver Heger commented on CONFIGURATION-452:
--------------------------------------------

Thanks for reporting this.

This is probably not trivial to fix because the XPATH expression passed to setProperty() has
to be interpreted to find the parent of the selected node. Is there a way in XPATH to retrieve
the parent of an expression?

Will have to think about it and have a look at the XPATH spec. Ideas or even patches are welcome.

> HierarchicalConfiguration with XPathExpressionEngine does not work when setting a new
property
> ----------------------------------------------------------------------------------------------
>
>                 Key: CONFIGURATION-452
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-452
>             Project: Commons Configuration
>          Issue Type: Bug
>          Components: Expression engine
>    Affects Versions: 1.6
>         Environment: all
>            Reporter: Fabien Nisol
>
> The following code does not work as expected
> {code:title=Bug.java|borderStyle=solid}
> public class Bug {
> 	public static void main(String[] args) {
> 		try {
> 			XMLConfiguration config = new XMLConfiguration();
> 			// works
> 			config.setProperty("test.property[@attribute]", "value");
> 			config.setExpressionEngine(new XPathExpressionEngine());
> 			config.save(System.out);
> 			// works
> 			config.setProperty("test/property/@attribute", "value");
>                         // does not work
> 			config.setProperty("test/property/@attribute2", "value");
> 		} catch (ConfigurationException e) {
> 			// @FIXME Traitement d'exception par defaut
> 			throw new RuntimeException(e);
> 		}
> 	}
> }
> {code}
> hangs with the following exception:
> Exception in thread "main" java.lang.IllegalArgumentException: prepareAdd: Passed in
key must contain a whitespace!
> 	at org.apache.commons.configuration.tree.xpath.XPathExpressionEngine.prepareAdd(XPathExpressionEngine.java:223)
> 	at org.apache.commons.configuration.HierarchicalConfiguration.addPropertyDirect(HierarchicalConfiguration.java:371)
> 	at org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.addPropertyDirect(AbstractHierarchicalFileConfiguration.java:140)
> 	at org.apache.commons.configuration.HierarchicalConfiguration.setProperty(HierarchicalConfiguration.java:749)
> 	at org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.setProperty(AbstractHierarchicalFileConfiguration.java:158)
> 	at Bug.main(Bug.java:29)
> the setProperty() method does not work if the property have to be added. This behavior
is not really wanted, because in some generic cases, we don't know if the property is set
or not before trying to set it.

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