I am trying to convert XML to java object. In my xml, there is field which looks like:

<pickDisplayTs>2021-09-24T18:03:06.603  0000</pickDisplayTs>

My Java object looks like the following:

@XmlElement(name = "pickDisplayTs" )
@XmlJavaTypeAdapter(DateAdapter.class)
public Date pickDisplayTs;

My DataAdapter class is the following:

    import javax.xml.bind.annotation.adapters.XmlAdapter;
    import java.text.SimpleDateFormat;
    import java.util.Date;

   public class DateAdapter extends XmlAdapter<String, Date> {

   private static final String CUSTOM_FORMAT_STRING = "yyyy-MM- 
   dd'T'HH:mm:ss.SSS'Z'";


    @Override
    public Date unmarshal(String v) throws Exception {
    return new SimpleDateFormat(CUSTOM_FORMAT_STRING).parse(v);
   }

@Override
public String marshal(Date v) throws Exception {
    return new SimpleDateFormat(CUSTOM_FORMAT_STRING).format(v);
}

}

Code reference: https://github.com/eugenp/tutorials/blob/950bbadc353bdca114befc98cf4a18476352220e/jaxb/src/main/java/com/baeldung/jaxb/dateunmarshalling/DateAdapter.java

This is the method for unmarshalling the xml file:

  String filepath = "xml/PickComplete.xml";
  String xmlPickComplete = readFromResources(filepath);
  PickComp pickCompleteMq = Xml.xmlToObject(xmlPickComplete, PickingSubSystemOrderCompleteMessage.class);

The entire pickCompleteMq is coming to be null but if I am declaring the pickDisplayTs as string, its all good, not sure where I am going wrong. But I need the field to be in Date.

Any help will be appreciated. Thank you.

CodePudding user response：

The problem is with the input. XML extract you have provided doesn't follow the DateAdapter you are using. If you marshal a pojo that contain Date the expected xml tag should be

<pickDisplayTs>2022-02-16T14:02:13.010Z</pickDisplayTs>

Trying to parse the given input gives ParseException. Code snippet:

Date parse = new SimpleDateFormat(CUSTOM_FORMAT_STRING).parse("2021-09-24T18:03:06.603  0000");
System.out.println(parse);

Output

java.text.ParseException: Unparseable date: "2021-09-24T18:03:06.603 0000"
at java.text.DateFormat.parse(DateFormat.java:366)

Solution proposal:

    private static final String CUSTOM_FORMAT_STRING = "yyyy-MM-dd'T'HH:mm:ss.SSS Z";
    public static void main(String[] args) throws ParseException {
        String dateStr = "2021-09-24T18:03:06.603  0000";
        Date marshaledDate = new SimpleDateFormat(CUSTOM_FORMAT_STRING).parse(dateStr);

        SimpleDateFormat format = new SimpleDateFormat(CUSTOM_FORMAT_STRING);
        format.setTimeZone(TimeZone.getTimeZone("UTC"));

        String unmarshalledDate = format.format(marshaledDate);
        System.out.println(unmarshalledDate);
    }