However, it might not seem sensible to do this. I can not inquire the fresh developers why it actually was done so method, they aren’t here any longer. It project’s story can only just find out using their Git record.
We suspect we are having fun with Spring season Studies Other people wrong, incorrectly mix WebMVC principles. If we hadn’t done this from the beginning, something will have focus on far easier. We have been today carried out with the brand new Springtime Data Others migration. It is the right time to move onto the second Springtime module, Spring Kafka. Spring season Kafka, or in other words Spring getting Apache Kafka , is an excellent treatment for play with Kafka on the Spring season systems. It gives effortless-to-have fun with layouts to have giving texts and you can regular Spring annotations for drinking messages.Springtime Kafka
Configuring this new customers
step step one [ERROR] coffees.lang.IllegalStateException: Did not stream ApplicationContext 2 step three Triggered by: org.springframework.kidney beans.facility.BeanCreationException: Mistake carrying out bean having term 'consumerFactory' defined in classification road capital [ de / software / config / KafkaConsumerConfig . class ]: cuatro 5 Caused by: java . lang . NullPointerException six at java . feet / java . util . concurrent . ConcurrentHashMap . putVal ( ConcurrentHashMap . java: ten11 ) 7 at java . base / java . util . concurrent . ConcurrentHashMap . init >( ConcurrentHashMap . java: 852 ) 8 at org . springframework . kafka . center . DefaultKafkaConsumerFactory . init >( DefaultKafkaConsumerFactory . java: 125 ) 9 at org . springframework . kafka . core . DefaultKafkaConsumerFactory . init >( DefaultKafkaConsumerFactory . java: 98 ) 10 at de . app . config . KafkaConsumerConfig . consumerFactory ( AbstractKafkaConsumerConfig . java: 120 )
It turns out, we had been configuring the consumerConfigs bean and setting null values in its properties. The following change from HashMap to ConcurrentHashMap means we can no longer configure null values. We refactored our code and now tests are green. Easy-peasy.
Kafka messages that have JsonFilter
1 [ERROR] org .apache .kafka mon .mistakes .SerializationException : Normally 't serialize research [Experience [payload=MyClass(Id=201000000041600097, . mujeres Suecia ] having procedure [my-topic] 2 3 Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Don't manage PropertyFilter with id ‘myclassFilter' ; zero FilterProvider configured (by way of resource chain: de- .shot .Enjoy [ "payload" ] ) 4 in the com .fasterxml .jackson .databind .exc .InvalidDefinitionException .off (InvalidDefinitionException .coffees : 77 )
Some of our Java Beans use ato manipulate the serialization and deserialization. This requires a propertyFilter to be configured on the ObjectMapper.
Spring for Apache Kafka made a change to the JsonSerializer , introducing an ObjectWriter . When the ObjectWriter instance is created, the ObjectMapper configuration is copied, not referenced. Our test case was re-configuring the ObjectMapper with the appropriate propertyFilter after the ObjectWriter instance was created. Hence, the ObjectWriter didn't know anything about the propertyFilter (since the configuration was already copied). After some refactoring, changing how we create and configure the JsonSerializer , our test cases were green.
Running our build $ mvn clean verify finally resulted in a green build. Everything is working as it should. We pushed our changes to Bitbucket and everything built like a charm.
Sessions discovered updating Spring Kafka
Instructions learned while in the Springtime Footwear upgrade
Spring and Spring Boot do a great job documenting their releases, their release notes are well maintained. That being said, upgrading was challenging, it took quite a while before everything was working again. A big part of that is on us, for not following best practices, guidelines, etc. A lot of this code was written when the team was just starting out with Spring and Spring Boot. Code evolves over time, without refactoring and applying those latest practices. Eventually that catches up with you, but we use this as a learning experience and improved things. Our test cases are now significantly better, and we'll keep a closer eye on them moving forward.