JAXB unmarshal XML elements to HashMap

Question

I found a lot of articles that describe how to unmarshal a sequence of XML elements to a HashMap as long as they are within a \"parent\" element. However, I do not get this to w

Answer 1

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.

JAXB will treat each object relationship with a nesting relationship. Map is treated like an Object instead of a Collection so this is why you are getting the behaviour that you are seeing.

MOXy has an XPath based mapping extension called @XmlPath that could be used for this use case.

package com.foo.conf;

import java.util.Map;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement; 
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import org.eclipse.persistence.oxm.annotations.XmlPath;

@XmlRootElement(name="checks")
public class Checks {       
    @XmlJavaTypeAdapter(ChecksAdapter.class)
    @XmlPath(".")
    public Map checkMap;     
}

For More Information

• http://blog.bdoughan.com/2010/07/xpath-based-mapping.html
• http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html