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4. Learn more

The microservices used in this workshop were generated using MicroProfile starter. If you want to create a new MicroProfile project, do the following:

  1. Let's create a new project using MP Starter page. Access the page https://start.microprofile.io/. mp starter

  2. Use the following the data and click on download. You will get a zip file with an automatically generated project for you to get started.

Method Description
groupId org.a4j
artifactId hello-helidon
MicroProfile Version 3.3
Build Tool Maven
MicroProfile Runtime Helidon

4.1 Using Helidon CLI [Optional]

You can use Helidon CLI for executing tasks like creating new projects and using a feature called "Developer Loop". The Developer Loop allows you to leverage hot reload features while coding your helidon services.

  1. Using a terminal, access your project's folder hello-helidon.
  2. Run the app using the dev loop with: 
    helidon dev

  3. After the tool finishes downloading the artifacts, you should be able to see something like: 

    | downloading artifacts
| building
| build completed (1.9 seconds)
| hello-helidon starting

...

2022.05.27 22:59:32 INFO io.helidon.common.HelidonFeatures !thread!: Helidon MP 2.4.1 features: [CDI, Config, Fault Tolerance, Health, JAX-RS, Metrics, Open API, REST Client, Security, Server, Tracing]

    Alert

    Sometimes the dev loop might not work on the first initialization of helidon dev. To avoid issues, you can stop the service with ctrl+c (or cmd+c) and start it again with helidon dev.

  4. Open the service in your browser: http://localhost:8080/data/hello

  5. On your IDE, open the class org.a4j.hello.helidon.HelloController

  6. Change the endpoint path to devloop and the string returned by the method sayHello to "Hello Dev Loop!"
  7. Back in your browser, check your changes reflected at http://localhost:8080/data/devloop

4.2 Additional information

When you are you GraalVM, you can compile your helidon services using Ahead of Time compilation. AoT is a strategy to have the compilation processing during build time, allowing you to create native executable files with fast startup time.

For more information check the Helidon docs for Helidon SE GraalVM native image.

Last update: 2022-10-11
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