When using JaxB marshalling how to avoid adding a particular element/value

Question

I have a XML data which looks like below. I need to be able to marshall/unmarshall this. The objective is simple and I am not facing any problem there

Code snippet for the XML

In my main POJO class Messages I have a hashmap which I am using for mapping message to the ID. I would like to have the messagemap not go into XML. In short I would like to know if their is any particular annotation or way which I can use simply to avoid a particular data (in this case the HashMap) to not go to generated XML when I do marshalling

Snippet of XML which gets generated on marshalling

In my main POJO class Messages I have a hashmap which I am using for mapping message to the ID. I would like to have the messagemap not go into XML.

===============POJO for message entry===================

package code.rfid.common.salami;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlValue;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "message")
public class Message {

    @XmlValue
    protected String value;
    @XmlAttribute(name = "msg-id")
    protected String msgId;
    @XmlAttribute(name = "msg-type")
    protected String msgType;
    @XmlAttribute(name = "msg")
    protected String msg;

    public static String INFO = "info";
    public static String ERROR = "error";
    public static String WARNING = "warning";

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public String getMsgId() {
        return msgId;
    }

    public void setMsgId(String value) {
        this.msgId = value;
    }

    @Override
    public String toString() {
        return "Message [value=" + value + ", msgId=" + msgId + ", msgType="
                + msgType + ", msg=" + msg + "]";
    }

    public String getMsgType() {
        return msgType;
    }

    public void setMsgType(String value) {
        this.msgType = value;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String value) {
        this.msg = value;
    }
}

=========POJO for messages====================

package code.rfid.common.salami;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "messages")
public class Messages {

    @Override
    public String toString() {
        return "Messages [message=" + message + ", messageMap=" + messageMap
                + "]";
    }

    protected List message;
    protected HashMap messageMap;

    public List getMessage() {
        if (message == null) {
            message = new ArrayList();
        }
        return this.message;
    }

    public HashMap getMessageMap() {
        if (messageMap == null) {
            messageMap = new HashMap();
        }
        return messageMap;
    }

    public void populateMessageMap()
    {
        messageMap = new HashMap();
        if(message == null || message.isEmpty())
            return;
        for(Message _message: message)
        {
            messageMap.put(_message.getMsgId(), _message);
        }
    }
}

======================== Code for marshalling and unmarshalling

package code.rfid.common;

import java.io.StringReader;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import code.rfid.common.salami.Messages;

public class MessageJaxBPort {

    static String responseString =""
                            + ""
                            + ""
                            + ""
                            + ""
                        + "";

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(Messages.class);
            Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();

            Messages mapmessages = (Messages) jaxbUnmarshaller.unmarshal(new StringReader( responseString));
            System.out.println("UserInfo object :- " + mapmessages.toString());

            Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
            jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            jaxbMarshaller.marshal(mapmessages, System.out);
        } catch (JAXBException jaxbEx) {
            jaxbEx.printStackTrace();
        }
    }
}

EJK · Accepted Answer

Add the @XmlTransient annotation to your message map property as follows:

@XmlTransient
public HashMap getMessageMap() {

This will cause the marshaler to exclude this property.

When using JaxB marshalling how to avoid adding a particular element/value

Answers (1)

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