title: Duplicate Values while using ObjectMapper of Jackson
body: <p>My Bean class is as below. When the mapping happens, the JSON object contains duplicate values. </p>
  
  <p>Response:</p>
  
  <pre><code>{"Id":"00PJ0000003mOgMMAU","Name":"web.xml","name":"web.xml","id":"00PJ0000003mOgMMAU"}
  </code></pre>
  
  <p>Why the values are getting duplicated?</p>
  
  <pre><code>import org.codehaus.jackson.annotate.JsonIgnoreProperties;
  import org.codehaus.jackson.annotate.JsonProperty;
  @JsonIgnoreProperties(ignoreUnknown = true)
  public class AttachmentsMapper
  {
      @JsonProperty(value = "Id")
      private String Id;
  
      @JsonProperty(value = "Name")
      private String Name;
  
  
      public String getId() {
              return Id;
          }
      public void setId(String Id) {
          this.Id = Id;
      }
      public String getName() {
          return Name;
      }
      public void setName(String Name) {
          this.Name = Name;
      }
  
  }
  </code></pre>