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From "Oliver Heger (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (CONFIGURATION-301) NullPointerException in XMLConfiguration.save() after creating it from HierarchicalConfiguration
Date Thu, 13 Dec 2007 06:52:43 GMT

     [ https://issues.apache.org/jira/browse/CONFIGURATION-301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Oliver Heger resolved CONFIGURATION-301.
----------------------------------------

    Resolution: Fixed

A fix has been applied. Thank you for spotting this.

> NullPointerException in XMLConfiguration.save() after creating it from HierarchicalConfiguration
> ------------------------------------------------------------------------------------------------
>
>                 Key: CONFIGURATION-301
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-301
>             Project: Commons Configuration
>          Issue Type: Bug
>    Affects Versions: 1.4, Nightly Builds, 1.5
>         Environment: Sun JDK 1.5.0-13 on Debian GNU/Linux
>            Reporter: Daniel Kraft
>            Assignee: Oliver Heger
>            Priority: Minor
>             Fix For: 1.6
>
>
> The subject says it all, the following code reproduces it. The two commented lines work
around the bug: The first one fixes the NullPointerException, but destroys the name of the
root element; the second arranges for the name being recreated.
> import org.apache.commons.configuration.ConfigurationException;
> import org.apache.commons.configuration.SubnodeConfiguration;
> import org.apache.commons.configuration.XMLConfiguration;
> public class Tester {
> 	public static void main(String[] args) throws ConfigurationException {
> 		XMLConfiguration c1 = new XMLConfiguration("test.xml");
> 		c1.save(System.out);
> 		SubnodeConfiguration c1sub = c1.configurationAt("b");
> 		XMLConfiguration c2 = new XMLConfiguration(c1sub);
> 		// This fixes the error: c2.getRootNode().setName(null);
> 		// This fixes the name loss: c2.setRootElementName("b");
> 		c2.save(System.out);
> 	}
> }
> Here comes a simple configuration file to use (test.xml):
> <?xml version="1.0" encoding="utf-8"?>
> <a>
>   <b>
>     <c />
>   </b>
> </a>
> And here a Stracktrace against http://svn.apache.org/repos/asf/commons/proper/configuration/trunk@603551:
> Exception in thread "main" java.lang.NullPointerException
> 	at org.apache.commons.configuration.XMLConfiguration$XMLBuilderVisitor.insert(XMLConfiguration.java:1188)
> 	at org.apache.commons.configuration.HierarchicalConfiguration$BuilderVisitor.visitBeforeChildren(HierarchicalConfiguration.java:1642)
> 	at org.apache.commons.configuration.HierarchicalConfiguration$Node.visit(HierarchicalConfiguration.java:1319)
> 	at org.apache.commons.configuration.XMLConfiguration$XMLBuilderVisitor.processDocument(XMLConfiguration.java:1153)
> 	at org.apache.commons.configuration.XMLConfiguration.createDocument(XMLConfiguration.java:621)
> 	at org.apache.commons.configuration.XMLConfiguration.save(XMLConfiguration.java:711)
> 	at org.apache.commons.configuration.AbstractHierarchicalFileConfiguration$FileConfigurationDelegate.save(AbstractHierarchicalFileConfiguration.java:448)
> 	at org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:544)
> 	at org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:511)
> 	at org.apache.commons.configuration.AbstractHierarchicalFileConfiguration.save(AbstractHierarchicalFileConfiguration.java:214)
> 	at Tester.main(Tester.java:14)

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