可能需要显式配置并注册自定义编解码器或PojoCodec才能处理这种类型

Question

UserProfileModel具有两个嵌入式模型。我在这里简明扼要地给出：

@Document(collection = "USER_PROFILE")
public class UserProfileModel extends BaseModel<UserModel>  {

    public static final String FIELD_USER_ID = "userId";
    public static final String FIELD_BASIC_INFO = "basicInfo";
    public static final String FIELD_CONTACT_INFO = "contactInfo";

    private String userId;
    private BasicInfo basicInfo;
    private ContactInfo contactInfo;
}

public class BasicInfo {
    private String gender;
    private LocalDate birthDate;
    private String[] langs;
    private String religiousView;
    private String politicalView;
}

public class ContactInfo {
    private String[] mobilePhones;
    private Address address;
    private SocialLink[] socialLinks;
    private String[] websites;
    private String[] emails;
}

UserProfileModel的写转换器类：

@Component
@WritingConverter
public class UserProfileModelConverter implements Converter<UserProfileModel, Document> {

    @Override
    public Document convert(UserProfileModel s) {
        Document doc = new Document();

        if (null != s.getUserId())
            doc.put(UserProfileModel.FIELD_USER_ID, s.getUserId());

        if (null != s.getBasicInfo())
            doc.put(UserProfileModel.FIELD_BASIC_INFO, s.getBasicInfo());

        if (null != s.getContactInfo())
            doc.put(UserProfileModel.FIELD_CONTACT_INFO, s.getContactInfo());
    }
}

试图像这样保存UserProfileModel的对象：

@Autowired
private UserProfileRepository repo;

UserProfileModel profileModel = generateUserProfileModel();
repo.save(profileModel);

Exception：

org.bson.codecs.configuration.CodecConfigurationException: An exception occurred when encoding using the AutomaticPojoCodec.
Encoding a BasicInfo: 'BasicInfo(gender=Male, birthDate=2020-05-05, langs=[Lang 1, Lang 2], religiousView=Islam (Sunni), politicalView=N/A)' failed with the following exception:

Failed to encode 'BasicInfo'. Encoding 'langs' errored with: Can't find a codec for class [Ljava.lang.String;.

A custom Codec or PojoCodec may need to be explicitly configured and registered to handle this type.

    at org.bson.codecs.pojo.AutomaticPojoCodec.encode(AutomaticPojoCodec.java:53)
    at org.bson.codecs.EncoderContext.encodeWithChildContext(EncoderContext.java:91)
    at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:185)
    at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:199)
    at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:141)
    at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:45)
    at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
    at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)

---

如果我不通过在Mongo Config中添加将UserProfileModel用作转换器，则不会出现此异常，并且一切正常。

但是出于某种原因，我试图使用Converter类。

那么转换器类是否有问题或需要修改？

Answer 1

已在此问题上提出了一张吉拉车票here。

找不到类[Ljava.lang.String;]的编解码器

以及他们的回复

Document类当前仅支持列表，不支持本机Java 数组，因此只需替换为：

列表代码= Arrays.asList（“ 1112233”，“ 2223344”）;

因此，不支持字符串数组。在模型中使用List<String>代替String[]。