Spring Data MongoDB + Spring Boot 启动两次？

Question

我正在尝试使 Spring Data MongoDB(响应式(Reactive))与 Spring Boot 2.1.5(和 WebFlux)一起使用。

从启动日志中我怀疑出了什么问题，它似乎被初始化了两次(注意两次存储库扫描，它们甚至返回不同的结果):

2019.05.19 11:59:53 | INFO | org.springframework.data.repository.config.RepositoryConfigurationDelegate - Bootstrapping Spring Data repositories in DEFAULT mode.
2019.05.19 11:59:55 | INFO | org.springframework.data.repository.config.RepositoryConfigurationDelegate - Finished Spring Data repository scanning in 1235ms. Found 8 repository interfaces.
2019.05.19 11:59:55 | INFO | org.springframework.data.repository.config.RepositoryConfigurationDelegate - Bootstrapping Spring Data repositories in DEFAULT mode.
2019.05.19 11:59:55 | INFO | org.springframework.data.repository.config.RepositoryConfigurationDelegate - Finished Spring Data repository scanning in 64ms. Found 0 repository interfaces.
2019.05.19 11:59:59 | INFO | org.mongodb.driver.cluster - Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2019.05.19 11:59:59 | INFO | org.mongodb.driver.cluster - Cluster created with settings {hosts=[localhost:27017], mode=MULTIPLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
2019.05.19 11:59:59 | INFO | org.mongodb.driver.cluster - Adding discovered server localhost:27017 to client view of cluster
2019.05.19 12:00:00 | INFO | org.mongodb.driver.connection - Opened connection [connectionId{localValue:2, serverValue:13}] to localhost:27017
2019.05.19 12:00:00 | INFO | org.mongodb.driver.cluster - Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[4, 0, 9]}, minWireVersion=0, maxWireVersion=7, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=30, roundTripTimeNanos=16058831}
2019.05.19 12:00:00 | INFO | org.mongodb.driver.cluster - Discovered cluster type of STANDALONE
2019.05.19 12:00:00 | INFO | org.mongodb.driver.connection - Opened connection [connectionId{localValue:1, serverValue:14}] to localhost:27017
2019.05.19 12:00:00 | INFO | org.mongodb.driver.cluster - Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersion{versionList=[4, 0, 9]}, minWireVersion=0, maxWireVersion=7, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=30, roundTripTimeNanos=43838433}

我的构建文件中没有什么特别的:

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-webflux")
    implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
    implementation("org.springframework.boot:spring-boot-starter-validation")
    implementation("org.springframework.boot:spring-boot-starter-security")

    ...

    testImplementation("org.springframework.boot:spring-boot-starter-test")
    testImplementation("de.flapdoodle.embed:de.flapdoodle.embed.mongo")
    testImplementation("io.projectreactor:reactor-test")
    testImplementation("org.springframework.security:spring-security-test")
}

绝对没有关于 Mongo 的 Java 配置，只有 application.properties 设置:

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.authentication-database=admin
spring.data.mongodb.database=mydb
spring.data.mongodb.username=myuser
spring.data.mongodb.password=mypass

我做错了什么？

Answer 1

我遇到了同样的症状。看来我有一个实现 AbstractReactiveMongoConfiguration 的 Configuration 类，这导致 MongoClient 被创建了两次。将客户端创建留给框架并通过属性对其进行配置解决了我的案例中的问题。

这是使用 Spring Boot 2.1.6-RELEASE 进行测试的，具有与海报相同的依赖项集。