即使Kakfa处于关闭状态，应用程序也会启动

Question

我一直在研究弹簧云探测，以将迹线推至zipkin，我们正在借助spring-cloud-starter-stream-kafka和spring-cloud-sleuth-stream将迹线推至Kafka。>

下面是我添加到我的应用程序中的依赖项

compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-sleuth', version: '1.0.0.RELEASE'
compile group: 'org.springframework.cloud', name: 'spring-cloud-sleuth-stream', version: '1.2.4.RELEASE'
compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-stream-kafka', version: '1.2.0.RELEASE'
而且我的应用程序属性只有kafka代理，默认情况下，该代理将跟踪推送到sleuth主题spring.cloud.stream.kafka.binder.brokers=locahost:9092

截至目前，一切正常[[但我无法弄清楚如果Kafka关闭了，是否可以启动应用程序？

[从日志中我看到应用程序已启动，但是由于它将无法连接到kafka，因此我们将无法访问任何端点（在下面添加了一些日志）。正在寻找此解决方案，因为推送跟踪不是我的应用程序的主要功能。

Started testApp in 0.299 seconds (JVM running for 20.241)
[WARN] 2019-12-19 13:27:56,183 main org.apache.kafka.clients.producer.ProducerConfig - {} - The configuration 'key.deserializer' was supplied but isn't a known config.
[WARN] 2019-12-19 13:27:56,183 main org.apache.kafka.clients.producer.ProducerConfig - {} - The configuration 'value.deserializer' was supplied but isn't a known config.
[INFO] 2019-12-19 13:27:56,184 main org.apache.kafka.common.utils.AppInfoParser - {} - Kafka version : 0.11.0.0
[INFO] 2019-12-19 13:27:56,184 main org.apache.kafka.common.utils.AppInfoParser - {} - Kafka commitId : cb8625948210849f
[WARN] 2019-12-19 13:27:56,225 kafka-producer-network-thread | producer-1 org.apache.kafka.clients.NetworkClient - {} - Connection to node -1 could not be established. Broker may not be available.
[WARN] 2019-12-19 13:27:56,335 kafka-producer-network-thread | producer-1 org.apache.kafka.clients.NetworkClient - {} - Connection to node -1 could not be established. Broker may not be available.
[WARN] 2019-12-19 13:27:56,390 kafka-producer-network-thread | producer-1 org.apache.kafka.clients.NetworkClient - {} - Connection to node -1 could not be established. Broker may not be available.

[我一直在研究春季云搜索，将痕迹推到zipkin，我们正在借助spring-cloud-starter-stream-kafka和spring-cloud-sleuth-stream将跟踪推到Kafka，下面是...] >

Answer 1

您的版本是错误的。请不要自己设置版本，请使用如下所示的Spring Cloud BOM（spring-cloud-dependencies）依赖性管理

buildscript {
    dependencies {
        classpath "io.spring.gradle:dependency-management-plugin:0.5.2.RELEASE"
    }
}

apply plugin: "io.spring.dependency-management"

dependencyManagement {
     imports {
          mavenBom "org.springframework.cloud:spring-cloud-sleuth:${springCloudSleuthVersion}"
     }
}
dependencies {
    compile 'org.springframework.cloud:spring-cloud-starter-sleuth'
}