IllegalArgumentException:无法反序列化的实例

Question

我有一个Spring启动应用程序，我有一个BlogsService调用一个博客库，它应该返回一个与所传递的搜索查询相匹配的博客列表。我得到了以下由第76行引起的结果。有什么想法吗？谢谢

第76行：

return objectMapper.convertValue(searchEntity, BlogDetailsResponse.class);

IllegalArgument异常：不能反序列化的package.dto.BlogDetails响应的实例START_ARRAY令牌在[Source： UNKNOWN；行：-1，列：-1]在com.cor.devsquareawsservice.services.impl.BlogServiceImpl.search博客（BlogServiceImpl.java:76）~[类/： na]

BlogServiceImpl。JAVA

  @Override
  public BlogDetailsResponse searchBlogs(SearchBlogsRequest searchBlogsRequest) {
    try {
      final List<BlogEntity> searchEntity = blogsRepository.searchBlogs(searchBlogsRequest.getSearchBlogsQuery());
      return objectMapper.convertValue(searchEntity, BlogDetailsResponse.class);
    } catch (final Exception exception) {
      log.error(exception);
      throw new DevSquareDynamoDBException(ExceptionConstants.SERVICE_CREATE_BLOG_EXCEPTION_MESSAGE, exception);
    }
  }

博客epository.java

  public List<BlogEntity> searchBlogs(String query) {
    try {
      DynamoDBScanExpression scanExpression = new DynamoDBScanExpression();
      scanExpression.addFilterCondition("title", new Condition()
              .withComparisonOperator(ComparisonOperator.CONTAINS)
              .withAttributeValueList(new AttributeValue().withS(query)));
      return dynamoDBMapper.scan(BlogEntity.class, scanExpression);
    } catch (Exception ex) {
      log.error("failed to get blogs > " + query);
    }
    return null;
  }

Answer 1

这解决了我的问题。我需要绘制列表并隐藏每个实体。

  public List<BlogDetailsResponse> searchBlogs(SearchBlogsRequest searchBlogsRequest) {
    try {
      return blogsRepository.searchBlogs(searchBlogsRequest.getSearchBlogsQuery()).stream().map(e -> objectMapper
              .convertValue(e, BlogDetailsResponse.class))
              .collect(Collectors.toList());
    } catch (final Exception exception) {
      log.error(exception);
      throw new DevSquareDynamoDBException(ExceptionConstants.SERVICE_SEARCH_BLOGS_EXCEPTION_MESSAGE, exception);
    }
  }