How to generate Java classes from Avro schemas as part of a Gradle build?

For Maven there is an official Avro plugin to generate Java classes from Avro schemas.

However, for Gradle there exists no official plugin.

There is davidmc24/gradle-avro-plugin, but it is no longer maintained and it is looking for a maintainer.

How can I generate Java classes from Avro schemas as part of a Gradle build?

I have now created a simple Gradle task that generates the Avro Java classes.

import org.apache.avro.tool.SpecificCompilerTool

buildscript {
    dependencies {
        // Add the Avro code generation to the build dependencies so that it can be used in a Gradle task.
        classpath group: 'org.apache.avro', name: 'avro-tools', version: '1.11.1'
    }
}

plugins {
    // some project plugins
    id 'application'
}

def avroSchemasDir = "src/main/avro"
def avroCodeGenerationDir = "build/generated-main-avro-java"

// Add the generated Avro Java code to the Gradle source files.
sourceSets.main.java.srcDirs += [avroCodeGenerationDir]

dependencies {
    // some project dependencies
}

tasks.register('avroCodeGeneration') {
    // Define the task inputs and outputs for the Gradle up-to-date checks.
    inputs.dir(avroSchemasDir)
    outputs.dir(avroCodeGenerationDir)
    // The Avro code generation logs to the standard streams. Redirect the standard streams to the Gradle log.
    logging.captureStandardOutput(LogLevel.INFO);
    logging.captureStandardError(LogLevel.ERROR)
    doLast {
        // Run the Avro code generation.
        new SpecificCompilerTool().run(System.in, System.out, System.err, List.of(
                "-encoding", "UTF-8",
                "-string",
                "-fieldVisibility", "private",
                "-noSetters",
                "schema", "$projectDir/$avroSchemasDir".toString(), "$projectDir/$avroCodeGenerationDir".toString()
        ))
    }
}

tasks.withType(JavaCompile).configureEach {
    // Make Java compilation tasks depend on the Avro code generation task.
    dependsOn('avroCodeGeneration')
}

This task can be added to any Gradle build script.