DO NOT REPLY [Bug 32240] New: - XMLConfiguration::save() does not keep element hierarchy

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http://issues.apache.org/bugzilla/show_bug.cgi?id=32240

           Summary: XMLConfiguration::save() does not keep element hierarchy
           Product: Commons
           Version: 1.0 Final
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Configuration
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: Christian.Kemmer@viadee.de


I am using commons.configuration.XMLConfiguration to save some configuration
elements of my Java 1.4.2 application in a file. If I use nested elements in my
configuration, this structure is not mapped to the saved XML-File.

As an example, consider the following simple main method:

    public static void main(String[] args) {
        try {
        XMLConfiguration myXMLConfig = new XMLConfiguration();
        myXMLConfig.setProperty("A","valueA");
        myXMLConfig.setProperty("A.B","valueA.B");
        myXMLConfig.setProperty("A.B.C.D","valueA.B.C.D");
        myXMLConfig.setProperty("E.F.G.H","valueE.F.G.H");
        myXMLConfig.setProperty("I.J.K.L","valueI.J.K.L");
        myXMLConfig.setProperty("I.J.K",null);
        myXMLConfig.setProperty("I.J",null);
        myXMLConfig.setProperty("I",null);
        myXMLConfig.save("testConfig.xml");
        } catch (ConfigurationException e) {
            System.out.println("ERROR: " + e.toString());
        }
    }

What I expect to get by executing this piece of code is the following (modulo
formatting issues, of course):

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<A> valueA
  <B> valueB
    <C>
      <D> valueD
      </D>
   </C>
  </B>
</A>
<E>
  <F>
    <G>
      <H> valueE.F.G.H
      </H>
   </G>
  </F>
</E>
<I> null
  <J> null
    <K> null
      <L> valueI.J.K.L
      </L>
    </K>
  </J>
</I>
</configuration>

The null-values in I.J.K and so on have only been introduced to show that such a
workarund does not work, either.
What I actually receive by storing testConfig.xml is the following:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<A>valueA<B>valueA.B<D>valueA.B.C.D</D>
</B>
</A>
<H>valueE.F.G.H</H>
<L>valueI.J.K.L</L>
<K>null</K>
<J>null</J>
<I>null</I>
</configuration>

In my opinion, at least two failures can be seen above:
 a) The elements I, J, K, and L are not nested, but all declared on top level of
the XML-document
 b) Elements without any value are not automatically inserted as, e.g., element
C for the path A.B.C.D or elements E, F, and G for E.F.G.H

I also tried to use HierarchicalXMLConfiguration, but corresponding objects can
not be saved:
ERROR: org.apache.commons.configuration.ConfigurationException: Can't save
HierarchicalXMLConfigurations

I am using the final Version 1.0 (not RC1 nor RC2) JAR-Files provied by
http://jakarta.apache.org/commons/configuration/downloads.html

Best regards,

Christian Kemmer

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