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https://issues.apache.org/jira/browse/CONFIGURATION-560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825771#comment-13825771
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Oliver Heger commented on CONFIGURATION-560:
--------------------------------------------
It seems that you ran into a trap here. You created the configuration in the
following way:
{code}
XMLconfig = new XMLConfiguration("/tmp/sample.xml");
XMLconfig.load();
{code}
This actually loads the data twice! The constructor already loads the specified
file, the following load() operation loads it again constructing a union of the
data already available. Thus you end up with duplicate entries.
Just remove the additional load() call. This should solve the problem.
> Receiving duplicate list entries for XPATH expression on XML document via
> org.apache.commons.configuration.HierarchicalConfiguration.configurationsAt
> -----------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CONFIGURATION-560
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-560
> Project: Commons Configuration
> Issue Type: Bug
> Affects Versions: 1.10
> Reporter: Martin Schlegel
>
> The XPATH expression used selects only one element, but getList and
> configurationsAT retrieves the same element twice ... or I am simply not
> getting the manual :-)
> Please see the simple example code attached below.
> Fedora Linux FC 17
> Java 1.7
> Apache Commons Components used:
> commons-collections-3.2.1.jar
> commons-configuration-1.10.jar
> commons-jxpath-1.3.jar
> commons-lang-2.6.jar
> commons-logging-1.1.3.jar
> XML document "sample.xml":
> ____________________________________________
> <?xml version="1.0" encoding="UTF-8"?>
> <config>
> <names>
> <firstname id="1"> Peter </firstname>
> <firstname id="2"> Michael </firstname>
> <firstname id="3"> Alex </firstname>
> </names>
> </config>
> ____________________________________________
> Java code:
> ____________________________________________
> import java.util.List;
> import org.apache.commons.configuration.ConfigurationException;
> import org.apache.commons.configuration.HierarchicalConfiguration;
> import org.apache.commons.configuration.XMLConfiguration;
> import org.apache.commons.configuration.tree.xpath.XPathExpressionEngine;
> public class xmltest {
> public static void main(String[] args) {
>
> XMLConfiguration XMLconfig;
> try {
> XMLconfig = new XMLConfiguration("/tmp/sample.xml");
> XMLconfig.load();
> XMLconfig.setExpressionEngine(new
> XPathExpressionEngine());
>
> System.out.println("Retrieving firstname with id=2 via
> configurationsAt() ...");
> List<HierarchicalConfiguration> fields =
> XMLconfig.configurationsAt("names/firstname[@id='2']");
> for (HierarchicalConfiguration sub : fields) {
> System.out.println("=> names/firstname[@id='2']
> = " + sub.getString("."));
> }
> System.out.println("\nRetrieving firstname with id=2
> via getList() ...");
> List<Object> liObjects =
> XMLconfig.getList("names/firstname[@id='2']");
> for (Object obj : liObjects) {
> System.out.println("=> names/firstname[@id='2']
> = " + (String) obj);
> }
>
> System.out.println("\nRetrieving firstname with id=2
> via getString() ...");
> System.out.println("=> names/firstname[@id='2'] = " +
> XMLconfig.getString("names/firstname[@id='2']"));
> }
> catch (ConfigurationException e) {
> e.printStackTrace();
> }
> }
> }
> ____________________________________________
> Output:
> ____________________________________________
> Retrieving firstname with id=2 via configurationsAt() ...
> => names/firstname[@id='2'] = Michael
> => names/firstname[@id='2'] = Michael
> Retrieving firstname with id=2 via getList() ...
> => names/firstname[@id='2'] = Michael
> => names/firstname[@id='2'] = Michael
> Retrieving firstname with id=2 via getString() ...
> => names/firstname[@id='2'] = Michael
> ____________________________________________
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