How to add Micrometer Timer in KafkaListener class, created by KafkaListenerContainerFactory? - spring-boot

Question

When I try to autowire MicrometerRegistry to a class containing KafkaListener, I get the following error -
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'kafkaConsumer' defined in file [/apps/flux-mariadb-pipeline/build/classes/java/main/com/processor/consumer/KafkaConsumer.class]: Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.processor.consumer.KafkaConsumer]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:313)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:294)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1358)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:893)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at com.processor.App.main(App.java:10)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.processor.consumer.KafkaConsumer]: Constructor threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:217)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:117)
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:309)
... 20 common frames omitted
Caused by: java.lang.NullPointerException: null
at java.util.Objects.requireNonNull(Objects.java:203)
at io.micrometer.core.instrument.ImmutableTag.<init>(ImmutableTag.java:35)
at io.micrometer.core.instrument.Tag.of(Tag.java:29)
at io.micrometer.core.instrument.Tags.and(Tags.java:74)
at io.micrometer.core.instrument.Timer$Builder.tag(Timer.java:364)
at com.processor.consumer.KafkaConsumer.<init>(KafkaConsumer.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:204)
... 22 common frames omitted
KafkaConsumer class -
public KafkaConsumer(MeterRegistry meterRegistry) {
eventTimer =
Timer.builder("travel.time")
.description("The time it takes for the event to travel.")
.tag("topic", topic)
.publishPercentiles(.30, .65, .99)
.publishPercentileHistogram()
.minimumExpectedValue(Duration.ofMillis(1))
.maximumExpectedValue(Duration.ofMillis(5000))
.register(meterRegistry);
}
#KafkaListener(
topics = "${spring.kafka.consumer.properties.topic}",
groupId = "${spring.kafka.consumer.group-id}")
public void consume(
ConsumerRecord<String, DataRecord> record,
#Header(KafkaHeaders.RECEIVED_PARTITION_ID) Integer partition,
#Header(KafkaHeaders.OFFSET) Long offset,
Acknowledgment ack)
throws IOException {
.
.
}
I am creating KafkaListener container using the factory as below -
#Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>>
kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, String> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
factory.setConcurrency(8);
factory.getContainerProperties().setAckMode(AckMode.MANUAL_IMMEDIATE);
factory.setErrorHandler(getErrorHandler());
return factory;
}
Only way I found to add micrometer registry is like below
#Bean public ConsumerFactory<String, String> consumerFactory() {
Map<String, Object> props = kafkaProperties.buildConsumerProperties();
DefaultKafkaConsumerFactory<String, String> cf = new DefaultKafkaConsumerFactory<>(props);
cf.addListener(new MicrometerConsumerListener<>(meterRegistry(),
Collections.singletonList(new ImmutableTag("customTag", "customTagValue"))));
return cf;
}
Now, I do not know how to access this registry inside the #KafkaListener method

Answer 1

at io.micrometer.core.instrument.ImmutableTag.(ImmutableTag.java:35)
.tag("topic", topic)
The topic variable is null.
If it has a #Value annotation, you can't use it in the constructor; create the meter in an #PostConstruct method instead.