Spring Data Mongo 抛出 CodecConfigurationException：找不到 CodecCacheKey{clazz=class java.lang.Class，types=null}

Question

保存具有 Class 属性的文档时捕获异常 CodecConfigurationException: Can't find a codec for CodecCacheKey{clazz=class java.lang.Class, types=null}

@Document("my_document")
public class MyDocument {

    @Id
    private String id;

    @Field("jPt")
    private JobParameter<?> jobParameter;
}

public class JobParameter<T> implements Serializable {
    private T value;
    private Class<T> type;
    private boolean identifying;
}

尝试添加转换器但没有效果

    @Bean
    public MongoCustomConversions customConversions(List<Converter<?, ?>> foreignConverters) {
        List<Converter<?, ?>> converters = new ArrayList<>(List.of(
            JSR310DateConverters.ZonedDateTimeToDateConverter.INSTANCE,
            JSR310DateConverters.DateToZonedDateTimeConverter.INSTANCE,
            JSR310DateConverters.LongToDurationConverter.INSTANCE,
            JSR310DateConverters.DurationToLongConverter.INSTANCE,
            **new JobParameterMongoConverter()**
        ));
        converters.addAll(foreignConverters);
        MongoCustomConversions mongoCustomConversions = new MongoCustomConversions(converters);
        MongoCustomConversions.create(adapter -> adapter.useNativeDriverJavaTimeCodecs()
            .registerConverters(converters));
        return mongoCustomConversions;

Answer 1

我没有在转换器上使用正确的注释。我使用@ReadingConverter 而不是@WritingConverter。

Answer 2

我发现 Spring Boot 已将 Gradle 配置为拉取旧版本的 MongoDB Kotlin Coroutine 驱动程序 (4.8.2)，我不明白为什么。该驱动程序无法正确支持 Kotlin 数据类，因此我需要手动添加对一些 Mongo 项目的额外依赖项，以使一切再次正常运行。愚蠢的春天。

// MongoDB
implementation("org.mongodb:mongodb-driver-core:5.1.3") {
    because("Spring pulls 4.8.2 by default which does not support Kotlin. Have I mentioned that Spring is terrible.")
}
implementation("org.mongodb:bson:5.1.3") {
    because("Spring pulls 4.8.2 by default which does not support Kotlin.")
}
implementation("org.mongodb:mongodb-driver-reactivestreams:5.1.3") {
    because("Spring pulls 4.8.2 by default which does not support Kotlin.")
}

此后，默认编解码器可以正确处理数据类，甚至不需要指定。