com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class cn.edu.

package cn.edu.aynu.Bean;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import java.io.Serializable;
@JsonIgnoreProperties(value = { "hibernateLazyInitializer", "handler" })
public class Book implements Serializable {
    private String  bookName;
    private String author;

    public Book(){
    }

    public Book(String bookName, String author) {
        this.bookName = bookName;
        this.author = author;
    }
}