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August 17, 2018

Micronaut Mastery: Add Build Info To Info Endpoint

Micronaut has some built-in management endpoints to get information, a list of beans, health checks and more. To enable the endpoints we must add the dependency io.micronaut:management to our application. Then we can add configuration properties to enable the different endpoints. The /info endpoint gathers information from several sources with properties. If we want to add build information we must create a file with information and Micronaut will automatically add the properties from the file to the /info endpoint.

We can choose how we want to create the file. The location is configurable via Micronaut application configuration properties, but the default location is on the classpath at META-INF/ To make life easy for us we reuse the BuildInfo Gradle task from the Spring Boot Gradle plugin to create the file.

In the following example build file we add a build script classpath dependency on the Spring Boot Gradle plugin. This will add the BuildInfo class to our Gradle build file. Next we create a new task buildInfo using the BuildInfo type and we set the destination directory to the resources/main/META-INF directory in the project build directory. This is the default location that Micronaut uses to read the properties for the /info endpoint.

// File: build.gradle
buildscript {
   dependencies {
       classpath "org.springframework.boot:spring-boot-gradle-plugin:2.0.4.RELEASE"
dependencies {
    // Add management endpoint support.
    runtime "io.micronaut:management"
import org.springframework.boot.gradle.tasks.buildinfo.BuildInfo

task buildInfo(type: BuildInfo) {
    description = 'Generates file.'

    group = BasePlugin.BUILD_GROUP

    destinationDir = new File(sourceSets.main.output.resourcesDir, 'META-INF')

    properties {
        time = null // Otherwise task is never up-to-date
        artifact = shadowJar.baseName
        // Extra properties that will be added to
        additionalProperties = [
                operatingSystem: "${['']} (${['os.version']})",
                continuousIntegration: System.getenv('CI') ? true: false,
                machine: InetAddress.localHost.hostName,
classes.dependsOn buildInfo

In our application configuration we enable the /info endpoint:

# File: src/main/resources/application.yml
    enabled: true
    sensitive: false

We start our Micronaut application and invoke the /info endpoint and we get the following data:

    "build": {
        "artifact": "micronaut-sample",
        "by": "mrhaki",
        "continuous-integration": "false",
        "group": "mrhaki.micronaut",
        "machine": "",
        "name": "micronaut-sample",
        "operating-system": "Mac OS X (10.13.6)",
        "version": "1.0.1"

Written with Micronaut 1.0.0.M4.