Run all microservices in a multi-project gradle build

Question

I have a multi-project gradle build that's roughly set up like this:

RootProject
- ServiceA
- ServiceB
- ServiceC
- UI

Each of these subprojects is using the Spark framework and runs an embedded web server. It's basically a microservices setup, so they all need to be up and running for the system as a whole to work.

They each have a task defined like this:

task runApp(type: JavaExec) {
    main = 'App'
    classpath = sourceSets.main.runtimeClasspath
}

I know I can manually start each service either through my IDE or by opening a different terminal for each sub-project and running gradlew ServiceA:runApp, but what I'd like to do is create a runSystem task at the root level that will fire up everything to make it easy to run the whole system during development.

How can I do this with Gradle?

What happens if you run `runApp` in the root project? – RaGe Feb 28 '16 at 16:39 — RaGe, Feb 28 '16 at 16:39

score 2 · Accepted Answer · answered Feb 29 '16 at 12:20

If you run a task on the root project, Gradle invokes the same task (if it exists) on all the subprojects. Just execute runApp from the root folder.

In your case however, your runApp task might not exit because it starts a server, so execution will not move on to the next project. You can either enable parallel execution, or modify your tasks to run your server tasks in the background (using ProcessBuilder)

Run all microservices in a multi-project gradle build

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