Add Axenapi-generator as a classpath. First steps:

1. Add Axenapi-generator in classpath like this

buildscript {
    dependencies {
        classpath "pro.axenix-innovation:axenapi-generator:1.0.2-SNAPSHOT"
    }
}

2. Add openapi-generator (you can use another version of generator)

plugins {
    id "org.openapi.generator" version '7.0.0'
}

3. Add configuration for openapiGenerate. Use "kafka-codegen" as "generatorName".

openApiGenerate {
    generatorName = "kafka-codegen"
    inputSpec = getProjectDir().getAbsolutePath() + '/src/main/resources/joker.json'
    outputDir = getProjectDir().getAbsolutePath() + '/build'
    globalProperties = [
            apis           : "",
            models         : "",
            supportingFiles: 'ApiUtil.java'
    ]
    skipOverwrite = true
    configOptions = [
            useSpringBoot3 : "true",
            listenerPackage: 'axenapi.generated',
            modelPackage   : 'axenapi.generated.model',
            kafkaClient    : "false",
            interfaceOnly  : "false",
            useSpring3     : "false",
            resultWrapper  : "java.util.concurrent.CompletableFuture"
    ]
}

To use generator by openapi-generarator cli use command line:

$ java -cp "axenapi_generator/build/libs/axenapi-generator-2.0.0.jar;openapi-generator-cli.jar" org.openapitools.codegen.OpenAPIGenerator generate -g messageBroker -o out/ -i api-docs.json --additional-properties=kafkaBootstrap=localhost:29092