ExtraMongoConfiguration-2.kt

@EnableMongoRepositories(
    basePackages = ["com.example.multimongo.data.external"],
    mongoTemplateRef = "externalMongoTemplate")
@Configuration
class ExternalDatabaseConfiguration : ExtraMongoConfiguration() {
    @Value("\${additional-db.external.uri:}")
    override val uri: String? = null
    @Value("\${additional-db.external.host:}")
    override val host: String? = null
    @Value("\${additional-db.external.port:0}")
    override val port: Int? = 0
    @Value("\${additional-db.external.database:}")
    override val database: String? = null

    @Bean("externalMongoTemplate")
    fun externalMongoTemplate(): MongoTemplate = mongoTemplate()
}

@EnableMongoRepositories(
    basePackages = ["com.example.multimongo.data.internal"],
    mongoTemplateRef = "internalMongoTemplate")
@Configuration
class InternalDatabaseConfiguration : ExtraMongoConfiguration() {
    @Value("\${additional-db.internal.uri:}")
    override val uri: String? = null
    @Value("\${additional-db.internal.host:}")
    override val host: String? = null
    @Value("\${additional-db.internal.port:0}")
    override val port: Int? = 0
    @Value("\${additional-db.internal.database:}")
    override val database: String? = null

    @Bean("internalMongoTemplate")
    fun internalMongoTemplate(): MongoTemplate = mongoTemplate()
}