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
Priority: Minor
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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