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https://issues.apache.org/jira/browse/CONFIGURATION-301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Oliver Heger updated CONFIGURATION-301:
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Fix Version/s: 1.6
Assignee: Oliver Heger
You are right, I can reproduce the bug. The problem seems to be that the root
element's reference (which should point to the corresponding XML element) is
not correctly initialized. I will have a look.
> 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/[EMAIL
> PROTECTED]:
> 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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