[Issue]: Simple Key Config serializer exception

[CROprogrammer]

What happened?

When I try to send key of type integer and I use org.apache.kafka.common.serialization.IntegerSerializer, then I get error as specified below. I get an error like that for any serializer other than StringSerializer.

Simple Test Plan 2.zip

KloadGen Version

5.6.6

Relevant log output

2023-11-17 10:24:48,346 ERROR o.a.j.t.JMeterThread: Error while processing sampler: 'Java Request'.
org.apache.kafka.common.errors.SerializationException: Can't convert key of class java.lang.String to class org.apache.kafka.common.serialization.IntegerSerializer specified in key.serializer
	at org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:940) ~[kloadgen-5.6.6.jar:?]
	at org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:905) ~[kloadgen-5.6.6.jar:?]
	at com.sngular.kloadgen.sampler.KafkaProducerSampler.runTest(KafkaProducerSampler.java:159) ~[kloadgen-5.6.6.jar:?]
	at org.apache.jmeter.protocol.java.sampler.JavaSampler.sample(JavaSampler.java:197) ~[ApacheJMeter_java.jar:5.5]
	at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:651) ~[ApacheJMeter_core.jar:5.5]
	at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:570) ~[ApacheJMeter_core.jar:5.5]
	at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:501) ~[ApacheJMeter_core.jar:5.5]
	at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:268) ~[ApacheJMeter_core.jar:5.5]
	at java.lang.Thread.run(Thread.java:1623) ~[?:?]
Caused by: java.lang.ClassCastException: class java.lang.String cannot be cast to class java.lang.Integer (java.lang.String and java.lang.Integer are in module java.base of loader 'bootstrap')
	at org.apache.kafka.common.serialization.IntegerSerializer.serialize(IntegerSerializer.java:19) ~[kloadgen-5.6.6.jar:?]
	at org.apache.kafka.common.serialization.Serializer.serialize(Serializer.java:62) ~[kloadgen-5.6.6.jar:?]
	at org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:937) ~[kloadgen-5.6.6.jar:?]
	... 8 more
2023-11-17 10:24:48,346 INFO o.a.j.t.JMeterThread: Thread is done: Thread Group 1-1
2023-11-17 10:24:48,346 INFO o.a.j.t.JMeterThread: Thread finished: Thread Group 1-1
2023-11-17 10:24:48,346 INFO o.a.j.e.StandardJMeterEngine: Notifying test listeners of end of test
2023-11-17 10:24:48,346 INFO o.a.k.c.p.KafkaProducer: [Producer clientId=] Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.
2023-11-17 10:24:48,348 INFO o.a.k.c.m.Metrics: Metrics scheduler closed
2023-11-17 10:24:48,348 INFO o.a.k.c.m.Metrics: Closing reporter org.apache.kafka.common.metrics.JmxReporter
2023-11-17 10:24:48,349 INFO o.a.k.c.m.Metrics: Metrics reporters closed
2023-11-17 10:24:48,349 INFO o.a.k.c.u.AppInfoParser: App info kafka.producer for  unregistered
2023-11-17 10:24:48,349 INFO o.a.j.g.u.JMeterMenuBar: setRunning(false, *local*)

Have you added your JMX Testplan or a replica?

• I have added a JMX testplan

Have you added your Schema or a replica?

• I have added the Schema

[jemacineiras]

Hi @CROprogrammer,

I will take a look at it.

Cheers