SpringBoot Upgrade 2.3.7 to 2.5.4 - Issue with KafkaStreamsAutoConfiguration - spring-boot

Question

These are the Dependencies in the pom.xml. spring-cloud.version is 2020.0.3
<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>
<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-sleuth-zipkin</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
<dependency>
<groupId>io.zipkin.brave</groupId>
<artifactId>brave-instrumentation-spring-web</artifactId>
<version>5.6.10</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-kotlin</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
...Rest omitted
Application fails to start due to
Description:
Parameter 0 of method kafkaStreamsFunctionProcessorInvoker in org.springframework.cloud.stream.binder.kafka.streams.function.KafkaStreamsFunctionAutoConfiguration required a bean named '&getRestTemplate_registration' that could not be found.
Action:
Consider defining a bean named '&getRestTemplate_registration' in your configuration.
This is the weird part - i do have a Bean defined
/**
* Functional bean which gets / builds the RestTemplate for the given request
* #return the rest template or null if no configuration exists
*/
#Bean
fun getRestTemplate(): (RestCallRequest) -> RestTemplate? {
return { restCallRequest -> getRestTemplateNameForUrl(restCallRequest.url)?.let(::getOrBuildRestTemplate) }
}
and it's being Autowired like shown below in another Class
#Autowired
private lateinit var getRestTemplate: (RestCallRequest) -> RestTemplate?
Works in SpringBoot 2.3.7 but not now after the update. Can anyone please give me a hint how to resolve this.
Why is the Bean getting prefixed with an & and postfixed with _registration? I'm not using that Term in the whole application.
Desperatly i defined a Bean as suggested. Outcome was:
Consider defining a bean named '&getRestTemplate_registration_registration' in your configuration.

Answer 1

After a lot of debugging, the only workaround we were able to find is:
#SpringBootApplication(exclude =[KotlinLambdaToFunctionAutoConfiguration::class])
A Bug report containing a small sample project to reproduce the problem is written: https://github.com/spring-cloud/spring-cloud-function/issues/735.