Simple Java Xml to POJO mapping/binding?

Question

I\'m trying to figure out the simplest way to map an xml file to to a plain old java object.

Note: That in my example the xml doesn\'t quite match up with my intend

Answer 1

I consider JiBX the best of the bunch (JAXB, Castor, XMLBeans, etc.), particularly because I favor mapping files over annotations. Admittedly it has a decent learning curve, but the website has a lot of good examples. You must have missed the tutorial.

If you are only going one way (XML --> POJO) you could use Digester.

Side comment: I prefer mapping files over annotations because annotations:

• clutter the code (especially when using annotations from several products)
• mix concerns (XML, database, etc. in domain layer)
• can only bind to a single XML (or database, or web service, etc.) representation

Answer 2

This article may help you... it only requires you to know xpath http://onjava.com/onjava/2007/09/07/schema-less-java-xml-data-binding-with-vtd-xml.html

Answer 3

EclipseLink JAXB (MOXy) allows you to do the path based mapping that you are looking for:

@XmlRootElement 
class Animal 
{ 
 @XmlPath("standardName/Name/text()")
 private String name; 

 @XmlPath("standardVersion/VersionIdentifier/text()");
 private String versionIdentifier; 
} 

For more information see:

• http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
• http://bdoughan.blogspot.com/2010/07/xpath-based-mapping.html
• http://wiki.eclipse.org/EclipseLink/Examples/MOXy/GettingStarted/MOXyExtensions

EclipseLink also allows the metadata to be specified using an external configuration file:

• http://wiki.eclipse.org/EclipseLink/Examples/MOXy/GettingStarted/ExternalizedMetadata

Answer 4

Jakarta Commons Digester should do what you want.

Alternatively, I would recommend writing a transformation class that uses XPath to retrieve elements from the XML.