关于使用JAXB读取xml文档转换为java对象出现非法注解异常

import java.io.Serializable;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
//该注解表示xml文档的根元素
@XmlRootElement
public class Book implements Serializable {
  private static final long serialVersionUID = 2791336442194888575L;
  // 该注解代表xml文档的element
  @XmlElement
  private Integer id;
  @XmlElement
  private String name;
  @XmlElement
  private String author;
  public Integer getId() {
    return id;
  }
  public void setId(Integer id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getAuthor() {
    return author;
  }
  public void setAuthor(String author) {
    this.author = author;
  }
  @Override
  public String toString() {
    return "Book [id=" + id + ", name=" + name + ", author=" + author + "]";
  }
}

Class has two properties of the same name "author"
this problem is related to the following location:
at public java.lang.String com.yc.bean.Book.getAuthor()
at com.yc.bean.Book
this problem is related to the following location:
at private java.lang.String com.yc.bean.Book.author
at com.yc.bean.Book
Class has two properties of the same name "id"
this problem is related to the following location:
at public java.lang.Integer com.yc.bean.Book.getId()
at com.yc.bean.Book
this problem is related to the following location:
at private java.lang.Integer com.yc.bean.Book.id
at com.yc.bean.Book
Class has two properties of the same name "name"
this problem is related to the following location:
at public java.lang.String com.yc.bean.Book.getName()
at com.yc.bean.Book
this problem is related to the following location:
at private java.lang.String com.yc.bean.Book.name
at com.yc.bean.Book