使用JAXB将XML字符串解组为Java对象

Question

I want to convert the below XML string to Java object using JAXB.

I'm able to convert object but documents is coming as null after unmarshall. Result [hits=1, tookInMillis=10, totalHits=1, documents=null] How to correct documents object to get values?

XML String:

<result hits="1" tookInMillis="9" totalHits="1" xmlns="http://www.example.com/search/result/1.0">
   <documents>
      <document id="1" company="TEST" type="CN" generationDate="2018-05-24T06:05:37.000Z">
         <field type="xs:string" name="test1">test1</field>
         <field type="xs:string" name="test2">test2</field>
         <field type="xs:string" name="test3">test3</field>
         <field type="xs:string" name="test4">test4</field>
         <field type="xs:string" name="test5">test5</field>
         <field type="xs:string" name="test6">test6</field>
         <field type="xs:string" name="test7">test7</field>
         <field type="xs:string" name="test8">test8</field>
         <field type="xs:date" name="date">2018-05-23</field>
      </document>
   </documents>
</result>

Answer 1

You need to be careful with the XML namespaces.

In XML a namespace given in an XML element (like in <result> ) inherits to its child elements ( <documents> , <document> and <field> ).

In Java it does not. Therefore you need to give the namespace explicitly in the @XmlElement and @XmlElementWrapper annotations of the child properties.

The following Java classes work fine when unmarshalling your XML example. Especially, the collections Result.documents and Document.fields don't come as null .

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "result", namespace = "http://www.example.com/search/result/1.0")
public class Result {

    @XmlAttribute
    private int hits;

    @XmlAttribute
    private int tookInMillis;

    @XmlAttribute
    private int totalHits;

    @XmlElementWrapper(name = "documents", namespace = "http://www.example.com/search/result/1.0")
    @XmlElement(name = "document", namespace = "http://www.example.com/search/result/1.0")
    private List<Document> documents;

    // ... public getters and setters (omitted for brevity)
}

@XmlAccessorType(XmlAccessType.FIELD)
public class Document {

    @XmlAttribute
    private int id;

    @XmlAttribute
    private String company;

    @XmlAttribute
    private String type;

    @XmlAttribute
    private Date generationDate;

    @XmlElement(name = "field", namespace = "http://www.example.com/search/result/1.0")
    private List<Field> fields;

    // ... public getters and setters (omitted for brevity)
}