In graalvm, how to load tinylog.properties with native-image?

Question

I use graalvm to build a jar with tinylog and work very good! But when I use native-image build a exe,tinylog only work with default setting. what can I do let tinylog can load my tinylog.properties with native-image? please~ thanks!

Answer 1

On GitHub, you can find a minimal example project for using tinylog 2 in a native image build: https://github.com/tinylog-org/tinylog-graal-example

You need a custom Gradle task for generating the configuration for the native image (see tinylog-graal-example/blob/v2/build.gradle).

task generateConfiguration(type: Exec) {
    group = "graal"
    description = "Run application to generate the configuration for native image generation"
    dependsOn jar, extractGraalTooling
    commandLine project.gradle.gradleUserHomeDir.toPath().resolve("caches/com.palantir.graal/$graalVmVersion/graalvm-ce-$graalVmVersion/bin/java"), "-agentlib:native-image-agent=config-output-dir=" + project.buildDir.toPath().resolve("resources/main/META-INF/native-image"), "-cp", sourceSets.main.runtimeClasspath.getAsPath(), javaMainClass

    doFirst {
        mkdir project.buildDir.toPath().resolve("resources/main/META-INF/native-image")
    }
}

Afterwards, you can run ./gradlew generateConfiguration before ./gradlew nativeImage for generating always the correct configuration.

Answer 2

thanks @Martin I try to move src\main\resources\tinylog.properties to src\main\resources\META-INF\native-image\tinylog.properties

regenerate properties with native-image-agent and rebuild native-image. Than it can load properties! thank !