将嵌套元素绑定在标准JAXB2 POJO中

<rootNode>
  <node1>someValue</node1>
  <node2>someValue</node2>
  <groupOfNodes>
     <groupNode>
        <node3>someValue</node3>
        <node4>someValue</node4>
     </groupNode>
     <groupNode>
        <node3>someValue</node3>
        <node4>someValue</node4>
     </groupNode>
     <groupNode>
        <node3>someValue</node3>
        <node4>someValue</node4>
     </groupNode>
  </groupOfNodes>
</rootNode>

@XmlList

@XmlElementWrapper

@XmlElementWrapper

GroupNode

@XmlList

@XmlRootElement(name="rootNode")
@XmlAccessorType(XmlAccessType.FIELD)
public class MyNodes {
      @XmlElement(name="node1", required=false)
    private String node1;
    @XmlElement(name="node2", required=false)
    private String node2;   
     //tried this for the nested nodes but groupNodesList is always empty
       @XmlElementWrapper
  @XmlElement(name="groupOfNodes", required=false)
  private List<GroupNode> groupNodesList;
       //getters setters  

} 


   @XmlRootElement
   @XmlAccessorType(XmlAccessType.FIELD)
    public class GroupNode {
       @XmlElement(name="node3", required=false)
        private String node3;
        @XmlElement(name="node4", required=false)
        private String node4;             
         //getters setters  
    }