Updwithinfor theg Spring season Investigation Other people was not simple, however, that had absolutely nothing related to Springtime Studies Other people in itself
வழக்கறிஞர் ராஜாசுந்தர் ராமன்Mar 10, 2024
That said, may possibly not make sense to do that. I cannot query the latest designers why it actually was done so ways, they’re not here any more. That it project’s story can only just be told and their Git records.
Sessions read updating Spring season Study People
I suspect the audience is using Spring season Data Others wrong, incorrectly mix WebMVC basics. If we had not done so right away, one thing might have manage much easier.
We have been now completed with the Spring Study Rest migration. It’s time to circulate to our next Springtime module, Springtime Kafka.
Springtime Kafka
Spring Kafka, or in other words Spring season to possess Apache Kafka , is an excellent cure for play with Kafka on the Springtime tactics. It offers effortless-to-use themes to own sending messages and you will normal Spring season annotations to own drinking texts.
Configuring the newest consumers
step one [ERROR] coffees.lang.IllegalStateException: Didn't load ApplicationContext 2 step 3 Triggered by: org.springframework.kidney beans.factory.BeanCreationException: Error carrying out bean with name 'consumerFactory' defined in category street investment [ de / application / config / KafkaConsumerConfig . class ]: cuatro 5 Caused by: java . lang . NullPointerException 6 at java . feet / java . util . concurrent . ConcurrentHashMap . putVal ( ConcurrentHashMap . java: 1011 ) 7 at java . base / java . util . concurrent . ConcurrentHashMap . init >( ConcurrentHashMap . java: 852 ) 8 at org . springframework . kafka . key . 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 having JsonFilter
1 [ERROR] org .apache .kafka mon .errors .SerializationException : Is also 't serialize analysis [Skills [payload=MyClass(Id=201000000041600097, . ] getting thing [my-topic] 2 3 Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Don't care for PropertyFilter having id ‘myclassFilter' ; zero FilterProvider designed (compliment of reference chain: de .sample .Experience [ "payload" ] ) 4 on com .fasterxml .jackson .databind .exc .InvalidDefinitionException .from (InvalidDefinitionException .java : 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.
Classes discovered updating Spring season Kafka
Instructions learned during Springtime Boot inform
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.
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