spring-kafka-test | Spring Kafka Integration Test | Pub Sub library

I'm trying to use one transaction manager (ChainedTransactionManager) for Rabbit and Kafka, chaining RabbitTransactionManager and KafkaTransactionManager. We intend to achieve a Best effort 1-phase commit.

To test it, the transactional method throws an exception after the 2 operations (sending a message to a Rabbit exchange and publishing and event in Kafka). When running the test, the logs suggest a rollback is initiated but the message ends up in Rabbit anyway.

• Notes:

• We're using QPid to simulate in-memory RabbitMQ for testing (version 7.1.12)
• We're using an in-memory Kafka for testing (spring-kafka-test)
• Other relevant frameworks/libraries: spring-cloud-stream

Here's the method where the problem occurs:

I've written a basic spring boot service that consumes some data via rest API and publishes it to rabbitmq and kafka.

To test the service class handling kafka producing, I followed this guide: https://www.baeldung.com/spring-boot-kafka-testing

In isolation, the test (KafkaMessagingServiceImplTest) works perfectly both in intellij idea and via mvn on the command line. Running all project tests in idea works fine. However, when I run all project tests via maven on the command line, this test fails with an NPE when trying to make the assertion on the payload String.

I've narrowed down the location of the root problem to another test class (AppPropertiesTest) which is solely testing my AppProperties component (which is a component I use to pull config from application.properties in a tidy way). When, and only when, the tests within that test class are run alongside the failing test using 'mvn clean install' in project root, does the NPE show up. Commenting out the tests in this class or annotating it with @DirtiesContext fixes the problem. Apparently something loaded into the spring context by this test class causes an issue with the timing/order of events/countdownlatch in the other test. Of course, I don't want to use @DirtiesContext as it can lead to a much slower build as the project increases in complexity. It also does not explain the problem.. and I can't handle that :)

AppPropertiesTest uses constructor injection to inject the AppProperties component. It also extends a abstract class 'GenericServiceTest' which is annotated by:

I'm attempting to take advantage of Spring Cloud Kubernetes in my Spring Boot-based microservice, namely autoconfiguration and service discovery.

However, I get an error message (Timeout waiting for informers cache to be ready, is the kubernetes service up?) during the initialization, as well as high verbosity, both of which I am unable to find information online to help me pinpoint the cause. Error message and excessive log messages are detailed below. Apologies for the lack of context, but I'm also puzzled!

The application is running within the default service account, which has all the permissions specified in the documentation:

I have created a unit test to test the Kafka listener as shown below.

Cannot get custom store connected to my Transformer in Spring Cloud Stream Binder Kafka 3.x (functional style) following examples from here.

I am defining a KeyValueStore as a @Bean with type StoreBuilder>:

I am not getting any error while running in local. But when I deploy to the k8s cluster sometimes it fails to start the application.

Pom.xml

I am using spring-cloud-stream-binder-kafka-streams:3.1.1 with functional programming. I have tried a number of combinations to set GroupId but the Consumer is always printing GroupId as the spring.application.name.

pom.xml

I have an application that created with Spring boot and Spring kafka libraries. Now I added jsonschema2pojo-core library to my pom file. After adding this jar file my test cases are failing with below error

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'embeddedKafka': Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: scala/runtime/java8/JFunction0$mcZ$sp Caused by: java.lang.NoClassDefFoundError: scala/runtime/java8/JFunction0$mcZ$sp

I'm trying to run a Spring Boot project but I get the following error.