Helidon: Java Libraries for Microservices

Project Helidon is a set of Java Libraries for writing microservices. Helidon supports two programming models:

• Helidon MP: MicroProfile 5.0
• Helidon SE: a small, functional style API

In either case your application is just a Java SE program.

License

Helidon is available under Apache License 2.0.

Documentation

Latest documentation and javadocs are available at https://helidon.io/docs/latest.

Helidon White Paper is available here.

Get Started

See Getting Started at https://helidon.io.

Downloads / Accessing Binaries

There are no Helidon downloads. Just use our Maven releases (GroupID io.helidon). See Getting Started at https://helidon.io.

Helidon CLI

MacOS:

curl -O https://helidon.io/cli/latest/darwin/helidon
chmod +x ./helidon
sudo mv ./helidon /usr/local/bin/

Linux:

curl -O https://helidon.io/cli/latest/linux/helidon
chmod +x ./helidon
sudo mv ./helidon /usr/local/bin/

Windows:

PowerShell -Command Invoke-WebRequest -Uri "https://helidon.io/cli/latest/windows/helidon.exe" -OutFile "C:\Windows\system32\helidon.exe"

See this document for more info.

Books

The book Beginning Helidon is highly recommended for all Helidon 3.x users:

Available at Amazon and all other bookstores.

Build

You need JDK 17+ to build Helidon.

You also need Maven. We recommend 3.6.1 or newer.

Building the documentation requires the dot utility from Graphviz. This is included in many Linux distributions. For other platforms see https://www.graphviz.org/.

Full build

$ mvn install

Checkstyle

# Cd to the component you want to check
$ mvn validate  -Pcheckstyle

Copyright

# Cd to the component you want to check
$ mvn validate  -Pcopyright

Spotbugs

# Cd to the component you want to check
$ mvn verify  -Pspotbugs

Build Scripts

Build scripts are located in etc/scripts. These are primarily used by our pipeline, but a couple are handy to use on your desktop to verify your changes.

• copyright.sh: Run a full copyright check
• checkstyle.sh: Run a full style check

Get Help

• See the Helidon FAQ
• Ask questions on Stack Overflow using the helidon tag
• Join us on Slack: #helidon-users

Get Involved

• Learn how to contribute
• See issues for issues you can help with

Stay Informed

• Twitter: @helidon_project
• Blog: Helidon on Medium