GH-1595 Inherited @Bean from @StreamMessageConverter

Resolves #1595

spring-cloud-stream/src/main/java/org/springframework/cloud/stream/annotation/StreamMessageConverter.java

@@ -23,6 +23,7 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Bean;
 
 /**
  * Marker to tag {@link org.springframework.messaging.converter.MessageConverter} beans
@@ -35,6 +36,7 @@ import org.springframework.beans.factory.annotation.Qualifier;
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 @Qualifier
+@Bean
 public @interface StreamMessageConverter {
 
 }

spring-cloud-stream/src/test/java/org/springframework/cloud/stream/function/FunctionInvokerTests.java

@@ -92,7 +92,6 @@ public class FunctionInvokerTests {
 		}
 
 		@StreamMessageConverter
-		@Bean
 		public MessageConverter customConverter() {
 			return new MessageConverter() {
 
@@ -145,7 +144,6 @@ public class FunctionInvokerTests {
 		}
 
 		@StreamMessageConverter
-		@Bean
 		public MessageConverter customConverter() {
 			return new MessageConverter() {