未能将源 {} 映射到实体答案

【问题标题】：failed to map source {} to entity未能将源 {} 映射到实体
【发布时间】：2016-07-05 09:30:10
【问题描述】：

使用 Spring Data Elasticsearch 从 elasticsearch 读取文档时出现以下错误：

错误 SearchController - 嵌套异常：无法将源 { 文档数据 } 映射到书

@Entity
@Table(name="books")
@Document(indexName="booksearchserver",type="book")
public class Book {
@org.springframework.data.annotation.Id
@Id
@Column(name="bookIsbn")
@Field(type = FieldType.Long, store = true)
private String bookIsbn;

@Column(name="bookTitle")
@Field(type = FieldType.String, store = true)
private String bookTitle;


@Column(name="authorId")
@Field(type = FieldType.Integer, store = true)
private int bookAuthorId;

@Column(name="bookLanguage")
@Field(type = FieldType.String, store = true)
private String bookLanguage;

@Column(name="bookPublisherId")
@Field(type = FieldType.Integer, store = true)
private short bookPublisherId;

@Column(name="bookReleaseDate")
@Field(type = FieldType.Date, store = true, format = DateFormat.custom, pattern="yyyy-MM-dd HH:mm:ss +SSSS")
private Date bookReleaseDate;

@JsonIgnore
@Column(name="bookNoOfChapters")
private short bookNoOfChapters;

@JsonIgnore
@Column(name="bookNoOfPages")
private short bookNoOfPages;

@JsonIgnore
@Column(name="bookNoOfWords")
private int bookWordCount;

@JsonIgnore
@Column(name="bookPrecededByIsbn" )
private long bookPrecededBy;

@JsonIgnore
@Column(name="bookFollowedByIsbn")
private long bookFollowedBy;

@Column(name="bookDescription")
@Field(type = FieldType.String, store = true )
private String bookDescription;

@JsonIgnore
@Column(name="bookCoverImage")
private String bookCover;

我的控制器

@RequestMapping(value="/isbnSearch" ,method = RequestMethod.POST)
public String isbnSearch(@RequestParam("bookIsbn") String bookIsbn, Model m) {
    try{
        logger.info("Search for Book by ISBN:" + bookIsbn);
        Book book = searchServices.getBookByIsbn(bookIsbn);
        int authorId = book.getBookAuthorId();
        logger.info("Author ID is " + authorId );
        m.addAttribute("Book", book);
        return "showBook";
    }catch(Exception e){
        logger.error("Nested Exception : "+e.getMessage());
        m.addAttribute("error", e.getMessage());
        return "showError";
    }
}

SearchServerImpl

public Book getBookByIsbn(String isbn) {
//       try{
         Book book = esdao.findBybookIsbn(isbn);
         logger.info(""+ book.getBookTitle());
         return book;
//       }catch(ElasticsearchException ese){
//           logger.error("Nested Exception : " + ese.getMessage());
//           throw ese;
//       }catch(NullPointerException npe){
//           logger.error("Accessing NULL Class");
//           throw npe;
//       }
}

Esdao 存储库

package co.in.searchServer.repository;

import org.elasticsearch.index.query.QueryBuilder;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

import co.in.searchServer.model.Book;

public interface ESDao extends ElasticsearchRepository<Book,String> {
    Iterable<Book> search(QueryBuilder arg0);
    Book findBybookIsbn(String isbn);
//  <S extends Book> S index(S arg0);
}

请给我一些解决这个问题的建议和经验

【问题讨论】：

标签： spring spring-mvc elasticsearch jackson spring-data

【解决方案1】：

我知道抛出这个错误是因为 Java 无法将 json 中的自定义日期格式映射到实体属性 bookReleaseDate 。因此我们必须添加 @JsonProperty 注释，如下所示：

  @JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd HH:mm:ss +SSSS")
  @Column(name="bookReleaseDate")
  @Field(type = FieldType.Date, store = true, format = DateFormat.custom, pattern="yyyy-MM-dd HH:mm:ss +SSSS")
  private Date bookReleaseDate;

【讨论】：