Binder configuration error

Creating a simple producer application like this:

@SpringBootApplication
@EnableBinding(KafkaStreamProducerTestApplication.TestBinding.class)
public class KafkaStreamProducerTestApplication {
    
  public static void main(String[] args) {
    SpringApplication.run(KafkaStreamProducerTestApplication.class, args);
  }
	
  @RestController
  @RequestMapping("test")
  public class TestController {

    @Autowired
    private TestService testService;

    @RequestMapping(path = "stream/{message}", method = RequestMethod.POST, produces = { MediaType.APPLICATION_JSON_UTF8_VALUE })
    public ResponseEntity<?> stream(@PathVariable(name="message") String message) {
      ResponseEntity<?> response = ResponseEntity.ok().build();
		
      try {
        testService.stream(message);
      } catch (Exception e) {
        response = ResponseEntity
            .status(HttpStatus.INTERNAL_SERVER_ERROR)
            .body(ExceptionUtils.getStackTrace(e));
      }
			
      return response;
    }
  }		

  @Service
  public static class TestService {
		
    private TestBinding testBinding;

    public TestService(TestBinding testBinding) {
      this.testBinding = testBinding;
    }
		
    public void stream(String message) {
      testBinding.outboundEmails().send(new GenericMessage<String>(message));
    }
  }

  public interface TestBinding {
    String OUTPUT = "test-out";

    @Output(OUTPUT)
    MessageChannel outboundEmails();
  }
}

application.yml:

spring:   
  cloud:
    stream:
      kafka:
        binder:
          brokers: localhost:9092
      bindings:
        test-out:
          destination: "test"

build.gradle

buildscript {
	dependencies {
		classpath (group: 'org.springframework.boot', name: 'spring-boot-gradle-plugin', version: '2.0.3.RELEASE')
	}
}

apply plugin: 'java'
apply plugin: 'groovy'
apply plugin: 'maven'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'idea'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'stream-tests'
version = '0.0.1-SNAPSHOT'

dependencyManagement {
	imports {
		mavenBom 'org.springframework.boot:spring-boot-starter-parent:2.0.3.RELEASE'
		mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Finchley.RELEASE'
	}
}

dependencies {
	compile (group: 'org.springframework.boot', name: 'spring-boot-devtools')
	compile (group: 'org.springframework.boot', name: 'spring-boot-autoconfigure')
	compile (group: 'org.springframework.boot', name: 'spring-boot-starter-web')
	compile (group: 'org.springframework.boot', name: 'spring-boot-starter-actuator')

	compile (group: 'org.springframework.cloud', name: 'spring-cloud-stream')
	compile (group: 'org.springframework.cloud', name: 'spring-cloud-stream-binder-kafka-streams')

	compile (group: 'org.apache.kafka', name: 'kafka-streams', version: '1.1.0')
	compile (group: 'org.jolokia', name: 'jolokia-core', version: '1.5.0')
	compile (group: 'net.logstash.logback', name: 'logstash-logback-encoder', version: '5.1')

	compile (group: 'org.apache.commons', name: 'commons-lang3', version: '3.7')

	//	testCompile (group: 'org.springframework.cloud', name: 'spring-cloud-stream-test-support')
	testCompile (group: 'org.codehaus.groovy', name: 'groovy-all', version: '2.4.15', classifier: 'indy')
	testCompile (group: 'org.springframework.boot', name: 'spring-boot-starter-test')
	testCompile (group: 'org.spockframework', name: 'spock-spring', version: '1.1-groovy-2.4')
	testCompile (group: 'org.spockframework', name: 'spock-core', version: '1.1-groovy-2.4')

	/*
	 * XXX: Necessary for now, see https://docs.spring.io/spring-kafka/reference/htmlsingle/#deps-for-11x
	 */
	compile (group: 'org.springframework.kafka', name: 'spring-kafka', version: '2.1.7.RELEASE')
	testCompile (group: 'org.springframework.kafka', name: 'spring-kafka-test', version: '2.1.7.RELEASE')
	testCompile (group: 'log4j', name: 'log4j', version: '1.2.17')
	compile (group: 'org.apache.kafka', name: 'kafka-clients', version: '1.1.0')
	compile ('org.apache.kafka:kafka-clients:1.1.0:test@jar')
	testCompile ('org.apache.kafka:kafka_2.11:1.1.0')
	testCompile ('org.apache.kafka:kafka_2.11:1.1.0:test@jar')
}

Gives me an exception:

org.springframework.context.ApplicationContextException: Failed to start bean 'outputBindingLifecycle'; nested exception is java.lang.IllegalStateException: A default binder has been requested, but there is more than one binder available for 'org.springframework.integration.channel.DirectChannel' : , and no default binder has been set.
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:184)
	at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:52)
	at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356)
	at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:157)
	at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:121)
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:885)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:161)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243)
	at spring.cloud.stream.kafka.test.KafkaStreamProducerTestApplication.main(KafkaStreamProducerTestApplication.java:25)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.IllegalStateException: A default binder has been requested, but there is more than one binder available for 'org.springframework.integration.channel.DirectChannel' : , and no default binder has been set.
	at org.springframework.cloud.stream.binder.DefaultBinderFactory.getBinder(DefaultBinderFactory.java:127)
	at org.springframework.cloud.stream.binding.BindingService.getBinder(BindingService.java:308)
	at org.springframework.cloud.stream.binding.BindingService.bindProducer(BindingService.java:208)
	at org.springframework.cloud.stream.binding.BindableProxyFactory.bindOutputs(BindableProxyFactory.java:252)
	at org.springframework.cloud.stream.binding.OutputBindingLifecycle.doStartWithBindable(OutputBindingLifecycle.java:46)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
	at org.springframework.cloud.stream.binding.AbstractBindingLifecycle.start(AbstractBindingLifecycle.java:47)
	at org.springframework.cloud.stream.binding.OutputBindingLifecycle.start(OutputBindingLifecycle.java:29)
	at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181)
	... 19 common frames omitted

If I uncomment the test-support depedency I can start the application and it works, but messages will be sent to Kafka, as a test binder is taking over.

What am I doing wrong here?

[sobychacko]

@nikolajbrinch Looks like you are using the wrong binder in your build.gradle. Instead of using compile (group: 'org.springframework.cloud', name: 'spring-cloud-stream-binder-kafka-streams'), you need to use compile (group: 'org.springframework.cloud', name: 'spring-cloud-stream-binder-kafka')

[sruby]

@nikolajbrinch Looks like you are using the wrong binder in your build.gradle. Instead of using compile (group: 'org.springframework.cloud', name: 'spring-cloud-stream-binder-kafka-streams'), you need to use compile (group: 'org.springframework.cloud', name: 'spring-cloud-stream-binder-kafka')

i get the same problem,after replace this dependency , it work.