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我已经阅读了 spring-kafka 文档、我找到的示例和一半的 stackoverflow，但我不明白 @EmbeddedKafka 应该由谁工作。特别是对于集成测试。

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@EnableKafka
@EmbeddedKafka(controlledShutdown = true
//        brokerProperties = {"log.dir=${kafka.broker.logs-dir}",
//                "listeners=PLAINTEXT://localhost:${kafka.broker.port:3333}",
//                "auto.create.topics.enable=${kafka.broker.topics-enable:true}"}
                )

我必须在测试 application.properties 中添加以下内容：

….kafka.bootstrap-servers=${spring.embedded.kafka.brokers}

有了这一切，当测试它执行时，它抱怨几行关于 kafka 不可访问：

[Producer clientId=producer-2] Connection to node 0 could not be established. Broker may not be available.

但是在屏幕的一半之后，测试成功并完成了最后一条令人不快的消息：

2019-06-17 12:31:54.438  WARN [testing,,,] 32448 --- [ost-startStop-1] o.a.c.loader.WebappClassLoaderBase       : The web application [testing] appears to have started a thread named [kafka-producer-network-thread | producer-3] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
 sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
 sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
 sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
 sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
 org.apache.kafka.common.network.Selector.select(Selector.java:674)
 org.apache.kafka.common.network.Selector.poll(Selector.java:396)
 org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:460)
 org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:239)
 org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:163)
 java.lang.Thread.run(Thread.java:748)

问题：1/为什么在每个方法开始时都会有关于代理不可用的消息，即使上下文没有脏并重新初始化？2/为什么会出现带有未关闭线程的丑陋消息？怎么了？

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