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Getting started with Quarkus

This is a minimal CRUD service exposing a couple of endpoints over REST.

Under the hood, this demo uses:

  • RESTEasy to expose the REST endpoints
  • REST-assured and JUnit 5 for endpoint testing

Requirements

To compile and run this demo you will need:

  • JDK 1.8+
  • GraalVM

Configuring GraalVM and JDK 1.8+

Make sure that both the GRAALVM_HOME and JAVA_HOME environment variables have been set, and that a JDK 1.8+ java command is on the path.

See the Building a Native Executable guide for help setting up your environment.

Building the application

Launch the Maven build on the checked out sources of this demo:

./mvnw package

Live coding with Quarkus

The Maven Quarkus plugin provides a development mode that supports live coding. To try this out:

./mvnw quarkus:dev

This command will leave Quarkus running in the foreground listening on port 8080.

  1. Visit the default endpoint: http://127.0.0.1:8080.
  2. Visit the /hello endpoint: http://127.0.0.1:8080/hello
    • Update the response in src/main/java/org/acme/quickstart/GreetingResource.java. Replace hello with hello there in the hello() method.
    • Refresh the browser. You should now see hello there.
    • Undo the change, so the method returns hello again.
    • Refresh the browser. You should now see hello.

Run Quarkus in JVM mode

When you're done iterating in developer mode, you can run the application as a conventional jar file.

First compile it:

./mvnw package

Then run it:

java -jar ./target/getting-started-1.0-SNAPSHOT-runner.jar

Have a look at how fast it boots, or measure the total native memory consumption.

Run Quarkus as a native executable

You can also create a native executable from this application without making any source code changes. A native executable removes the dependency on the JVM: everything needed to run the application on the target platform is included in the executable, allowing the application to run with minimal resource overhead.

Compiling a native executable takes a bit longer, as GraalVM performs additional steps to remove unnecessary codepaths. Use the native profile to compile a native executable:

./mvnw package -Dnative

After getting a cup of coffee, you'll be able to run this executable directly:

./target/getting-started-1.0-SNAPSHOT-runner