mongodb - 调用 mongo 存储库的保存方法时未调用 Mongo Date 自定义转换器

Question

我正在使用 Linux Debian 9。我已经安装了 JDK 1.8。我使用的maven版本是3.6，springboot的版本是2.1。 mongodb版本是3.6。

下面是我试图保存在 mongodb 中的 java 类模型:

@org.springframework.data.mongodb.core.mapping.Document(collection = FileContentIndexQueue.ENTITY_COLLECTION_NAME)
@CompoundIndexes({
    @CompoundIndex(name = "state_timestamp", def = "{'state' : 1, 'timestamp': -1}")
})
@QuerySupertype
public class FileContentIndexQueue extends AbstractEntityNoLock {
        ...

    private ZonedDateTime timestamp;


    public FileContentIndexQueue() {
    }

    public FileContentIndexQueue(String fileId, String parentId, String childType, String indexName) {
        super();
        this.fileId = fileId;
        this.parentId = parentId;
        this.childType = childType;
        this.indexName = indexName;
        this.state = IndexingState.TODO;
        this.timestamp = ZonedDateTime.now();
    }

        ...

    public ZonedDateTime getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(ZonedDateTime timestamp) {
        this.timestamp = timestamp;
    }


}

我正在使用 spring data mongodb，下面是存储库类和自定义存储库类及其实现:

//Repository 
public interface FileContentIndexQueueRepositoryMongoElastic extends 
                MongoElasticRepository<FileContentIndexQueue, String>
                , FileContentIndexQueueRepositoryCustom 
{
}


//Custom Repository
public interface FileContentIndexQueueRepositoryCustom {
    void addFileWithContentToExtract(AbstractEntityNoLock entity, IFile file) throws CommonAllegatiException;
    void removeFileWithContentToExtract(AbstractEntityNoLock entity, IFile file) throws CommonAllegatiException;    
}

//Custom Repository Class Implementation
public class FileContentIndexQueueRepositoryCustomImpl implements FileContentIndexQueueRepositoryCustom {


    @Autowired
    @Lazy
    private FileContentIndexQueueRepositoryMongoElastic fileContentIndexQueueRepositoryMongoElastic;

    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;

    @Autowired
    private MongoTemplate mongoTemplate;

    @Override
    public void addFileWithContentToExtract(AbstractEntityNoLock entity, IFile file) throws CommonAllegatiException {
        if(entity.getId() == null) {
            throw new CommonAllegatiException("Impossibile creare il FileContentIndexQueue da una entity senza id quindi non ancora salvata");
        }
        if(file == null) {
            throw new CommonAllegatiException("Impossibile creare il FileContentIndexQueue da un IFile null");
        }
        if(file.getFileId() == null) {
            throw new CommonAllegatiException("Impossibile creare il FileContentIndexQueue da un IFile senza id");
        }
        //da ricavare dalla entity
        String parentId = entity.getId();
        String indexName = elasticsearchTemplate.getPersistentEntityFor(entity.getClass()).getIndexName();
        String fileId = file.getFileId();

        FileContentIndexQueue fciq = new FileContentIndexQueue(fileId, parentId, CHILDTYPE, indexName);
        fileContentIndexQueueRepositoryMongoElastic.save(fciq); 
          //**after the save is the point where the error is generated**
    }

    @Override
    public void removeFileWithContentToExtract(AbstractEntityNoLock entity, IFile file) throws CommonAllegatiException {
              ...
    }   

}

上面的所有类都是库的一部分，我用 maven 从公司存储库下载了它，我无法修改。问题是 FileContentIndexQueue.java 模型有一个类型为 ZonedDateTime 的属性时间戳，mongo db 不支持这种类型，spring 数据没有内置转换器并抛出错误:org.bson.codecs.configuration。 CodecConfigurationException:找不到类 java.time.ZonedDateTime 的编解码器。

下面还有应用程序属性文件，其中包含我为 mongo db 和 Elasticsearch 设置的属性:

 #MongoDB
spring.data.mongodb.uri=mongodb://localhost:27017/?safe=true&w=1
spring.data.mongodb.database=operaTestDb

 #Elasticsearch
spring.data.elasticsearch.cluster-name=elasticsearch
spring.data.elasticsearch.cluster-nodes=localhost:9300
spring.data.mongoelastic.save-on-elastic=true

我尝试创建客户转换器并注册转换器以在调用 mongo 存储库的保存方法时调用。下面是我实现的解决方案的代码。

@Configuration
public class ConverterConfig  {

    @Autowired
    MongoDbFactory mongoDbFactory;


    @Bean
    public MongoTemplate mongoTemplate() throws UnknownHostException {
        MappingMongoConverter converter = new MappingMongoConverter(
                new DefaultDbRefResolver(mongoDbFactory), new MongoMappingContext());
        converter.setCustomConversions(customConversions());
        converter.afterPropertiesSet();
        return new MongoTemplate(mongoDbFactory, converter);
    }


    @Bean
    public MongoCustomConversions customConversions() {
        List<Converter<?, ?>> converters = new ArrayList<>();
        converters.add(DateToZonedDateTimeConverter.INSTANCE);
        converters.add(ZonedDateTimeToDateConverter.INSTANCE);
        return new MongoCustomConversions(converters);
    }

    enum DateToZonedDateTimeConverter implements Converter<Date, ZonedDateTime> {

        INSTANCE;

        @Override
        public ZonedDateTime convert(Date source) {
            return ZonedDateTime.ofInstant(source.toInstant(), ZoneId.systemDefault());
        }
    }

    enum ZonedDateTimeToDateConverter implements Converter<ZonedDateTime, Date> {

        INSTANCE;

        @Override
        public Date convert(ZonedDateTime source) {
            return Date.from(source.toInstant());
        }
    }
}

问题是即使我创建转换器并注册它们，错误:org.bson.codecs.configuration.CodecConfigurationException: 找不到类 java.time.ZonedDateTime 的编解码器。仍然存在。我在转换器中进行了调试，但它没有到达那里。就像转换器根本没有注册一样。我将不胜感激关于我应该如何调试的任何建议，或者如果您有不使用转换器的其他解决方案来解决此问题。将模型属性从 ZonedDatetime 修改为另一种日期格式不是选项，因为我无权访问该库。

亲切的问候，兰多。

Answer 1

此问题已通过在 ConverterConfig 类中进行以下修改解决:

1. 从方法 customConversions() 中删除 bean 注释
2. 从转换方法中删除覆盖注释
3. 在 DateToZonedDateTimeConverter 枚举中添加 @ReadingConverter 注解
4. 在ZonedDateTimeToDateConverterenum中添加@WritingConverter注解

以下是适用于我的 ConverterConfig 类版本。我希望它能帮助你不要像我一样浪费时间。

@Configuration
public class ConverterConfig {
    @Autowired
    MongoDbFactory mongoDbFactory;
    @Bean
    public MongoTemplate mongoTemplate() throws UnknownHostException {
        MappingMongoConverter converter = new MappingMongoConverter(new DefaultDbRefResolver(mongoDbFactory),
                new MongoMappingContext());
        converter.setCustomConversions(customConversions());
        converter.afterPropertiesSet();
        return new MongoTemplate(mongoDbFactory, converter);
    }
    public MongoCustomConversions customConversions() {
        List<Converter<?, ?>> converters = new ArrayList<>();
        converters.add(DateToZonedDateTimeConverter.INSTANCE);
        converters.add(ZonedDateTimeToDateConverter.INSTANCE);
        return new MongoCustomConversions(converters);
    }
    @ReadingConverter
    enum DateToZonedDateTimeConverter implements Converter<Date, ZonedDateTime> {
        INSTANCE;
        public ZonedDateTime convert(Date source) {
            return source == null ? null : ZonedDateTime.ofInstant(source.toInstant(), ZoneId.systemDefault());
        }
    }
    @WritingConverter
    enum ZonedDateTimeToDateConverter implements Converter<ZonedDateTime, LocalDateTime> {
        INSTANCE;
        public LocalDateTime convert(ZonedDateTime source) {
            return source == null ? null : LocalDateTime.ofInstant(source.toInstant(), ZoneId.systemDefault());
        }
    }
}