我正在尝试使用Kotlin的Spring Cloud Stream。我写了一个简单的使用者，如下所示：
@Bean
fun log(): Consumer<Person> {
return Consumer<Person> { person: Person -> println("Received: ${person.name}") }
}
Spring Cloud Stream找不到该使用者并立即退出。它不会给出错误，而只是终止。
如果我用以下代码在Java中编写完全相同的使用者，则Stream Cloud Stream会找到该使用者并消耗输入。
@Bean
public Consumer<Person> log() {
return person -> {
System.out.println("Received: " + person.getName());
};
}
为什么Spring Cloud Stream无法在Kotlin中找到我的消费者？
这是Spring Boot Console的输出：
2020-05-26 08:01:29.167 INFO 78463 --- [ main] c.a.s.t.TestBinderApplicationKt : Starting TestBinderApplicationKt on mburbidg-macOS with PID 78463 (/Users/mburbidg/test-binder/build/classes/kotlin/main started by mburbidg in /Users/mburbidg/test-binder)
2020-05-26 08:01:29.181 INFO 78463 --- [ main] c.a.s.t.TestBinderApplicationKt : No active profile set, falling back to default profiles: default
2020-05-26 08:01:30.109 INFO 78463 --- [ main] faultConfiguringBeanFactoryPostProcessor : No bean named 'errorChannel' has been explicitly defined. Therefore, a default PublishSubscribeChannel will be created.
2020-05-26 08:01:30.113 INFO 78463 --- [ main] faultConfiguringBeanFactoryPostProcessor : No bean named 'taskScheduler' has been explicitly defined. Therefore, a default ThreadPoolTaskScheduler will be created.
2020-05-26 08:01:30.114 DEBUG 78463 --- [ main] faultConfiguringBeanFactoryPostProcessor : The '#jsonPath' SpEL function cannot be registered: there is no jayway json-path.jar on the classpath.
2020-05-26 08:01:30.114 DEBUG 78463 --- [ main] faultConfiguringBeanFactoryPostProcessor : SpEL function '#xpath' isn't registered: there is no spring-integration-xml.jar on the classpath.
2020-05-26 08:01:30.116 INFO 78463 --- [ main] faultConfiguringBeanFactoryPostProcessor : No bean named 'integrationHeaderChannelRegistry' has been explicitly defined. Therefore, a default DefaultHeaderChannelRegistry will be created.
2020-05-26 08:01:30.145 INFO 78463 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.integration.config.IntegrationManagementConfiguration' of type [org.springframework.integration.config.IntegrationManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-26 08:01:30.147 INFO 78463 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration$IntegrationJmxConfiguration' of type [org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration$IntegrationJmxConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-26 08:01:30.153 INFO 78463 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration' of type [org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-26 08:01:30.156 INFO 78463 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'mbeanServer' of type [com.sun.jmx.mbeanserver.JmxMBeanServer] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-26 08:01:30.166 INFO 78463 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'integrationChannelResolver' of type [org.springframework.integration.support.channel.BeanFactoryChannelResolver] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-26 08:01:30.167 INFO 78463 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'integrationDisposableAutoCreatedBeans' of type [org.springframework.integration.config.annotation.Disposables] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-26 08:01:30.468 INFO 78463 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService 'taskScheduler'
2020-05-26 08:01:30.484 INFO 78463 --- [ main] c.f.c.c.BeanFactoryAwareFunctionRegistry : Looking up function '' with acceptedOutputTypes: []
2020-05-26 08:01:30.601 DEBUG 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Registering beans for JMX exposure on startup
2020-05-26 08:01:30.602 INFO 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Registering MessageChannel errorChannel
2020-05-26 08:01:30.603 DEBUG 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Located managed bean 'org.springframework.integration:type=MessageChannel,name=errorChannel': registering with JMX server as MBean [org.springframework.integration:type=MessageChannel,name=errorChannel]
2020-05-26 08:01:30.660 INFO 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Registering MessageChannel nullChannel
2020-05-26 08:01:30.660 DEBUG 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Located managed bean 'org.springframework.integration:type=MessageChannel,name=nullChannel': registering with JMX server as MBean [org.springframework.integration:type=MessageChannel,name=nullChannel]
2020-05-26 08:01:30.678 INFO 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Registering MessageHandler errorLogger
2020-05-26 08:01:30.679 DEBUG 78463 --- [ main] o.s.i.monitor.IntegrationMBeanExporter : Located managed bean 'org.springframework.integration:type=MessageHandler,name=errorLogger,bean=internal': registering with JMX server as MBean [org.springframework.integration:type=MessageHandler,name=errorLogger,bean=internal]
2020-05-26 08:01:30.700 DEBUG 78463 --- [ main] faultConfiguringBeanFactoryPostProcessor :
Spring Integration global properties:
spring.integration.channels.autoCreate=true
spring.integration.taskScheduler.poolSize=10
spring.integration.readOnly.headers=
spring.integration.channels.maxUnicastSubscribers=0x7fffffff
spring.integration.endpoints.noAutoStartup=
spring.integration.messagingTemplate.throwExceptionOnLateReply=false
spring.integration.channels.maxBroadcastSubscribers=0x7fffffff
2020-05-26 08:01:30.701 DEBUG 78463 --- [ main] .s.i.c.GlobalChannelInterceptorProcessor : No global channel interceptors.
2020-05-26 08:01:30.703 INFO 78463 --- [ main] o.s.i.endpoint.EventDrivenConsumer : Adding {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
2020-05-26 08:01:30.703 INFO 78463 --- [ main] o.s.i.channel.PublishSubscribeChannel : Channel 'application.errorChannel' has 1 subscriber(s).
2020-05-26 08:01:30.703 INFO 78463 --- [ main] o.s.i.endpoint.EventDrivenConsumer : started bean '_org.springframework.integration.errorLogger'
2020-05-26 08:01:30.716 INFO 78463 --- [ main] c.a.s.t.TestBinderApplicationKt : Started TestBinderApplicationKt in 2.32 seconds (JVM running for 3.12)
2020-05-26 08:01:30.722 INFO 78463 --- [extShutdownHook] o.s.i.endpoint.EventDrivenConsumer : Removing {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
2020-05-26 08:01:30.723 INFO 78463 --- [extShutdownHook] o.s.i.channel.PublishSubscribeChannel : Channel 'application.errorChannel' has 0 subscriber(s).
2020-05-26 08:01:30.723 INFO 78463 --- [extShutdownHook] o.s.i.endpoint.EventDrivenConsumer : stopped bean '_org.springframework.integration.errorLogger'
2020-05-26 08:01:30.724 INFO 78463 --- [extShutdownHook] o.s.s.c.ThreadPoolTaskScheduler : Shutting down ExecutorService 'taskScheduler'
2020-05-26 08:01:30.726 DEBUG 78463 --- [extShutdownHook] o.s.i.monitor.IntegrationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2020-05-26 08:01:30.726 DEBUG 78463 --- [extShutdownHook] o.s.i.monitor.IntegrationMBeanExporter : Unregistering JMX-exposed beans
2020-05-26 08:01:30.727 INFO 78463 --- [extShutdownHook] o.s.i.monitor.IntegrationMBeanExporter : Summary on shutdown: bean 'errorChannel'
2020-05-26 08:01:30.727 INFO 78463 --- [extShutdownHook] o.s.i.monitor.IntegrationMBeanExporter : Summary on shutdown: nullChannel
2020-05-26 08:01:30.727 INFO 78463 --- [extShutdownHook] o.s.i.monitor.IntegrationMBeanExporter : Summary on shutdown: bean '_org.springframework.integration.errorLogger.handler' for component '_org.springframework.integration.errorLogger'
Process finished with exit code 0
答案 0 :(得分：0)
我刚刚对此进行了测试；并没有问题...
@SpringBootApplication
open class So62025232Application {
@Bean
open fun input(): Consumer<String> {
return Consumer { x: String? -> println(x) }
}
@Bean
open fun runner(template: RabbitTemplate): ApplicationRunner {
return ApplicationRunner { args: ApplicationArguments? ->
template.convertAndSend("input-in-0.foo", "foo")
Thread.sleep(2000)
}
}
companion object {
@JvmStatic
fun main(args: Array<String>) {
val ctx = SpringApplication.run(So62025232Application::class.java, *args)
println(ctx.getBeansOfType(Consumer::class.java))
ctx.close()
}
}
}
spring.cloud.stream.bindings.input-in-0.group=foo
foo
{input=com.example.demo.So62025232Application$input$1@2a65bb85}
Java版本
@SpringBootApplication
public class So62025232Application {
public static void main(String[] args) {
ConfigurableApplicationContext ctx = SpringApplication.run(So62025232Application.class, args);
System.out.println(ctx.getBeansOfType(Consumer.class));
ctx.close();
}
@Bean
Consumer<String> input() {
return System.out::println;
}
@Bean
public ApplicationRunner runner(RabbitTemplate template) {
return args -> {
template.convertAndSend("input-in-0.foo", "foo");
Thread.sleep(2000);
};
}
}
答案 1 :(得分：0)
谢谢！您的回答帮助我找出了问题所在。我的应用确实如下所示：
@SpringBootApplication
open class TestBinderApplication
fun main(args: Array<String>) {
runApplication<TestBinderApplication>(*args)
}
@Bean
fun log(): Consumer<Person> {
return Consumer<Person> { person: Person -> println("Received: ${person.name}") }
当我将其更改为：
@SpringBootApplication
open class TestBinderApplication {
@Bean
open fun log(): Consumer<Person> {
return Consumer<Person> { person: Person -> println("Received: ${person.name}") }
}
companion object {
@JvmStatic
fun main(args: Array<String>) {
runApplication<TestBinderApplication>(*args)
}
}
}
成功了！
我是Kotlin的新手，所以我不确定有什么区别。