kmogo Kotlin中的uuidconfigurationexception

Question

import org.litote.kmongo.KMongo
fun main() {
    val client = Kmongo.createClient(/* connection string from mongodb */)
    val database = client.getDatabase(/* databaseName */)

}

我的代码^

这就是它返回的内容：

Exception in thread "main" org.bson.codecs.configuration.CodecConfigurationException: Changing the default UuidRepresentation requires a CodecRegistry that also implements the CodecProvider interface
    at org.litote.kmongo.KMongo.createRegistry(KMongo.kt:89)
    at org.litote.kmongo.KMongo.createClient(KMongo.kt:78)
    at org.litote.kmongo.KMongo.createClient(KMongo.kt:60)
    at org.litote.kmongo.KMongo.createClient(KMongo.kt:50)
    at MainKt.main(Main.kt:3) 
    at MainKt.main(Main.kt)

出于安全考虑，我省略了不相关的附加代码和数据库名称。

谢谢你提前帮忙！

Answer 1

从这里的kmongo源代码：https://github.com/Litote/kmongo/blob/master/kmongo-core/src/main/kotlin/org/litote/kmongo/KMongo.kt，这似乎是因为UUID表示形式是JAVA_LEGACY。

因此，您应该向MongoClientSettings提供一个createClient对象，该对象指定JAVA_LEGACY以外的UUID表示形式。因为UuidRepresentation是枚举(https://mongodb.github.io/mongo-java-driver/3.5/javadoc/org/bson/UuidRepresentation.html)，所以可以尝试使用STANDARD。

如下所示：

val settings = MongoClientSettings.builder()
.applyConnectionString(ConnectionString("Connection String here"))
.uuidRepresentation(UuidRepresentation.STANDARD)
.codecRegistry(KMongoUtil.defaultCodecRegistry)
.build()
val client = KMongo.createClient(settings)
// other code below...

这将使KMongo/MongoDB使用UuidRepresentation.STANDARD而不是UuidRepresentation.JAVA_LEGACY (在这种情况下，KMongo总是抛出异常)。

谢谢!