Java HTML / XML How to - Use nested class in the JAXB

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Question

We would like to know how to use nested class in the JAXB.

Answer

import java.io.StringWriter;
import java.util.Arrays;
import java.util.List;
//w  w  w  . java  2s.c  o  m
import javax.xml.bind.JAXBContext;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

public class Main {
  public static void main(String[] args) throws Exception {
    MessageRS message = new MessageRS();
    message.setUserId(10);
    MessageRS.Bucket bucket1 = new MessageRS.Bucket();
    bucket1.setText("This is sample text");
    bucket1.setChannels(Arrays.asList("Test A", "Test B"));
    MessageRS.Bucket bucket2 = new MessageRS.Bucket();
    bucket2.setText("Some more text");
    bucket2.setChannels(Arrays.asList("1", "2"));
    message.setBuckets(Arrays.asList(bucket1, bucket2));
    StringWriter writer = new StringWriter();
    JAXBContext.newInstance(MessageRS.class).createMarshaller()
        .marshal(message, writer);
    System.out.println(writer);
  }

  @XmlRootElement(name = "message")
  static class MessageRS {

    public static class Bucket {
      private List<String> channels;
      private String text;

      private Bucket() {
      }

      @XmlElementWrapper(name = "channels")
      @XmlElement(name = "channel")
      public List<String> getChannels() {
        return channels;
      }

      public void setChannels(List<String> channels) {
        this.channels = channels;
      }

      public String getText() {
        return text;
      }

      public void setText(String text) {
        this.text = text;
      }
    }

    private List<Bucket> buckets;

    private Long userId;

    private MessageRS() {
    }

    public List<Bucket> getBuckets() {
      return buckets;
    }

    public void setBuckets(List<Bucket> buckets) {
      this.buckets = buckets;
    }

    public long getUserId() {
      return userId;
    }

    public void setUserId(long UserId) {
      this.userId = UserId;
    }
  }

}

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