Hoxton.SR4 Kafka Streams and Spring Boot WebFlux 2.2.6 Actuator is not compatible

Hi,

Hoxton.SR4 kafka streams and Spring Boot WebFlux 2.2.6 + Actuator is not compatible where you get the error

Caused by: java.lang.IllegalStateException: Unable to map duplicate endpoint operations: [MBean call 'topology'] to topologyEndpoint
	at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.assertNoDuplicateOperations(EndpointDiscoverer.java:231) ~[spring-boot-actuator-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.convertToEndpoint(EndpointDiscoverer.java:198) ~[spring-boot-actuator-2.2.6.RELEASE.jar:2.2.6.RELEASE]

Downgrading so SR3 is fine. See an example pom.xml with the problem

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.melia</groupId>
	<artifactId>temp2</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>temp2</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>11</java.version>
		<spring-cloud.version>Hoxton.SR4</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
            <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
        </dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-webflux</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter</artifactId>
		</dependency>

	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

[sobychacko]

This is addressed through this change on 3.0.x: https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/commit/f0bd9f00c2e7132354fff1acf5d5d3e720e07bf8

Same change has been applied to master as well: https://github.com/spring-cloud/spring-cloud-stream-binder-kafka/commit/0a0d3a105708a5dfcd11c7711c3abfc9fea76d2f

@yonigibbs The typo is now fixed.

The next release of Horsham.SR9 (3.0.9) will contain this fix. Thank you! Please feel free to re-open the issue, if anyone still seeing any issues.

[jmelby70]

@sobychacko Even with the fix on 3.0.6 as noted, this is not compatible with spring-boot-actuator 2.3.1. Similar to the original error, I get the following (note MBean call ‘kafkaStreamsTopology’). I am using Spring Cloud Hoxton.SR6 and Spring Boot 2.3.1.RELEASE. The duplicate check appears to be counting the overloaded kafkaStreamsTopology method as a duplicate.

Caused by: java.lang.IllegalStateException: Unable to map duplicate endpoint operations: [MBean call 'kafkaStreamsTopology'] to topologyEndpoint
	at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.assertNoDuplicateOperations(EndpointDiscoverer.java:234)
	at org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer.convertToEndpoint(EndpointDiscoverer.java:201)