<!-- RabbitMQ configuration -->
<rabbit:connection-factory
        id="rabbitConnectionFactory_2"
        host="${queuing.events.host}"
        port="${queuing.events.port}"
        username="${queuing.events.username}"
        password="${queuing.events.password}"
        virtual-host="${queuing.events.virtual-host}"
        publisher-returns="true"/>

<rabbit:template id="amqpTemplate_2" connection-factory="rabbitConnectionFactory_2" />
<rabbit:admin id="rabbitAdmin_2" connection-factory="rabbitConnectionFactory_2"/>
<rabbit:listener-container connection-factory="rabbitConnectionFactory_2" auto-startup="true" requeue-rejected="false" />

<bean id="rabbitListenerContainerFactory_2" class="org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory">
    <property name="connectionFactory" ref="rabbitConnectionFactory_2"/>
</bean>
<!--  -->

<spring-cloud.version>Dalston.SR2</spring-cloud.version>

<spring-cloud.version>Edgware.RELEASE</spring-cloud.version>

Description:

Parameter 0 of method rabbitSender in org.springframework.cloud.sleuth.zipkin2.sender.ZipkinRabbitSenderConfiguration required a single bean, but 2 were found:
- rabbitConnectionFactory: defined in null
- rabbitConnectionFactory_2: defined in null


Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-sleuth-zipkin</artifactId>
    </dependency>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <spring-cloud.version>Dalston.SR2</spring-cloud.version> <!-- it works with this version-->
    <!-- <spring-cloud.version>Edgware.RELEASE</spring-cloud.version> -->  <!-- doesn't work with this version-->
</properties>

<dependencies>
    <!-- SPRING BOOT -->

    <!-- it fails because of this dependency in that we are using Edgware.RELEASE version -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-sleuth-zipkin</artifactId>
    </dependency>
    ...