Error with installation

[JunZhuang-MYGN]

Totally new to Kafka and Maven, hopefully the errors can be easily fixed.

Version info

• Kafka: 5.6.5
• JMeter: 5.6.2
• Maven: 3.9.4

Error during installation (on Windows). Note:

• Following https://raw.githubusercontent.com/wiki/sngular/kloadgen/installation.md#installation-as-a-jmeter-library by running c:\git\kloadgen>"C:\External Apps\apache-maven-3.9.4\bin\mvn" clean install
• As a result of the errors, no JAR file was produced

[ERROR] Errors: [ERROR] SchemaExtractorTest.testFlatPropertiesListWithAVRO:81->lambda$testFlatPropertiesListWithAVRO$1:81 ┬╗ Mockito [ERROR] SchemaExtractorTest.testFlatPropertiesListWithException:126->lambda$testFlatPropertiesListWithException$6:126 ┬╗ Mockito [ERROR] SchemaExtractorTest.testFlatPropertiesListWithJson:96->lambda$testFlatPropertiesListWithJson$2:96 ┬╗ Mockito [ERROR] SchemaExtractorTest.testFlatPropertiesListWithProtobuf:112->lambda$testFlatPropertiesListWithProtobuf$4:112 ┬╗ Mockito [INFO] [ERROR] Tests run: 327, Failures: 0, Errors: 4, Skipped: 1 [INFO] [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 15.325 s [INFO] Finished at: 2023-08-15T09:40:41-04:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test (default-test) on project kloadgen: There are test failures. [ERROR] [ERROR] Please refer to c:\git\kloadgen\target\surefire-reports for the individual test results. [ERROR] Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.

Error with producer sampler with a prebuilt jar

• Downloaded the kloadgen-5.6.5.jar file from https://mvnrepository.com/artifact/com.sngular/kloadgen/5.6.5 and copied to the JMETER/lib/ext
• The Jave Request sample with org.apache.jmeter.protocol.java.test.JavaTest did not have problem but with com.sngular.kloadgen.sampler.KafkaProducerSampler, I got following error:

2023-08-15 10:03:23,715 ERROR o.a.j.JMeter: Uncaught exception in thread Thread[#90,Thread Group 1-1,6,main] java.lang.IncompatibleClassChangeError: Expecting non-static method 'org.apache.jmeter.threads.JMeterVariables org.apache.jmeter.protocol.java.sampler.JavaSamplerContext.getJMeterVariables()' at com.sngular.kloadgen.sampler.SamplerUtil.setupCommonProperties(SamplerUtil.java:104) ~[kloadgen-5.6.5.jar:?] at com.sngular.kloadgen.sampler.KafkaProducerSampler.properties(KafkaProducerSampler.java:117) ~[kloadgen-5.6.5.jar:?] at com.sngular.kloadgen.sampler.KafkaProducerSampler.setupTest(KafkaProducerSampler.java:74) ~[kloadgen-5.6.5.jar:?] at org.apache.jmeter.protocol.java.sampler.JavaSampler.sample(JavaSampler.java:194) ~[ApacheJMeter_java.jar:5.6.2] at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:651) ~[ApacheJMeter_core.jar:5.6.2] at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:570) ~[ApacheJMeter_core.jar:5.6.2] at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:501) ~[ApacheJMeter_core.jar:5.6.2] at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:268) ~[ApacheJMeter_core.jar:5.6.2] at java.lang.Thread.run(Thread.java:1623) [?:?]

[AdrianLagartera]

I tested master with maven 3.9.1 and maven 3.9.4 and works fine. Looking your error trace looks like you have a problem with a specific plugin your maven didn't download at all, try with mvn clean -U install, if the problem persist try to delete the .m2/repository to make a clean installation (That action will force to download all the jars you have it downloaded previously).

In the other hand I never tried use the pre-built jar, so i don't know exactly if a error coming from use the last version of JMeter or from the pre-built jar.

And please the next time you had a problem like this, make a Issue instead of a discussion, because discussion are more related with concept or feature request instead of problem solving

[JunZhuang-MYGN]

Thanks for looking into it but your suggestions did not make the errors go away. I wonder if they have something to do with using OpenJDK?

`[ERROR] testFlatPropertiesListWithProtobuf Time elapsed: 0.634 s <<< ERROR!
org.mockito.exceptions.base.MockitoException:

Mockito cannot mock this class: class org.apache.jmeter.threads.JMeterContext.

If you're not sure why you're getting this error, please report to the mailing list.

Java : 20
JVM vendor name : Oracle Corporation
JVM vendor version : 20.0.1+9-29
JVM name : OpenJDK 64-Bit Server VM
JVM version : 20.0.1+9-29
JVM info : mixed mode, sharing
OS name : Windows 10
OS version : 10.0

You are seeing this disclaimer because Mockito is configured to create inlined mocks.
You can learn about inline mocks and their limitations under item #39 of the Mockito class javadoc.

Underlying exception : org.mockito.exceptions.base.MockitoException: Could not modify all classes [class org.apache.jmeter.threads.JMeterContext, class java.lang.Object]
at com.sngular.kloadgen.extractor.SchemaExtractorTest.lambda$testFlatPropertiesListWithProtobuf$4(SchemaExtractorTest.java:112)
at com.sngular.kloadgen.extractor.SchemaExtractorTest.testFlatPropertiesListWithProtobuf(SchemaExtractorTest.java:112)
Caused by: org.mockito.exceptions.base.MockitoException: Could not modify all classes [class org.apache.jmeter.threads.JMeterContext, class java.lang.Object]
at com.sngular.kloadgen.extractor.SchemaExtractorTest.lambda$testFlatPropertiesListWithProtobuf$4(SchemaExtractorTest.java:112)
at com.sngular.kloadgen.extractor.SchemaExtractorTest.testFlatPropertiesListWithProtobuf(SchemaExtractorTest.java:112)
Caused by: java.lang.IllegalStateException:

Byte Buddy could not instrument all classes within the mock's type hierarchy

This problem should never occur for javac-compiled classes. This problem has been observed for classes that are:

• Compiled by older versions of scalac
• Classes that are part of the Android distribution
  at com.sngular.kloadgen.extractor.SchemaExtractorTest.lambda$testFlatPropertiesListWithProtobuf$4(SchemaExtractorTest.java:112)
  at com.sngular.kloadgen.extractor.SchemaExtractorTest.testFlatPropertiesListWithProtobuf(SchemaExtractorTest.java:112)
  Caused by: java.lang.IllegalArgumentException: Java 20 (64) is not supported by the current version of Byte Buddy which officially supports Java 18 (62) - update Byte Buddy or set net.bytebuddy.experimental as a VM property
  at com.sngular.kloadgen.extractor.SchemaExtractorTest.lambda$testFlatPropertiesListWithProtobuf$4(SchemaExtractorTest.java:112)
  at com.sngular.kloadgen.extractor.SchemaExtractorTest.testFlatPropertiesListWithProtobuf(SchemaExtractorTest.java:112)`

[AdrianLagartera]

Checking that a few time ago same thing happens with Java 20 for a problem related with Byte Buddy, just change to Java 17 and the problem should be solved, if not I recommend you open a issue

[jemacineiras]

HI @JunZhuang-MYGN,
we try to support the LTS versions for java. In this moment the latest LTS is the 17. In the situation you describe, looks there is some incompatibilities between Mockito and Java 20. We are not the owners of Mockito so our only chance is wait until a new version of Mockito came and update our dependencies.

That works for you?

[JunZhuang-MYGN]

Hi guys, appreciate it for the investigation. I was able to achieve what I needed to do with JMeter without a Kafka plugin. thx