Summary

A lightweight open framework for building fast and efficient cloud-native Java microservices:

• Open Liberty is fast to start up with low memory footprint and live reload for quick iteration.
• Simple to add and remove features from the latest versions of MicroProfile and Java EE.
• Zero migration lets you focus on what's important, not the APIs changing under you.

Getting Started

Launch a sample app using Maven

git clone https://github.com/OpenLiberty/sample-getting-started.git
cd sample-getting-started
mvn clean package liberty:run

Open browser to http://localhost:9080/ and explore the demo application.

See this guide to learn how it works.

Downloads

• Maven Central
• Open Liberty website
• Docker Hub

Usage

Docker

• This guide demonstrates development using Docker containers.

Maven

• This guide demonstrates development using the Liberty Maven Plugin.

Command Line

• This reference demonstrates the basic server operation commands.

Open Liberty Docs

• Open Liberty Guides
• Reference docs including features, config and API's

Contributing

Our CONTRIBUTING document contains details for submitting pull requests. FYI: The project recently renamed master branch to release. More info here: https://github.com/OpenLiberty/open-liberty/wiki/Master-rename-to-Release

Running a Build

1. Clone the repository to your system.

   git clone git@github.com:OpenLiberty/open-liberty.git

2. Run a gradle build.

   Prerequisite - Environment variable JAVA_HOME must point to a Java 17 or Java 21 SDK. If setting JAVA_HOME to Java 17, you will also need to set JAVA_21_HOME to a Java 21 SDK.

   cd open-liberty/dev
   ./gradlew cnf:initialize
   ./gradlew assemble

   Troubleshooting - If ./gradlew assemble shows out of memory error, you can increase the memory in dev/gradle.properties file. Stop the gradle daemon after you change the memory setting by using ./gradlew --stop. If it does not help the problem, try cleaning up your maven repository cache (using rm -rf ~/.m2) and gradle cache (using rm -rf ~/.gradle/caches).

3. Run the unit or FAT tests.

   ./gradlew test for unit tests

   ./gradlew build.example_fat:buildandrun to run a FAT project

   NOTE: ./gradlew build runs the assemble and test tasks

4. Perform a local release

   ./gradlew releaseNeeded

   NOTE: This task releases all projects to the local releaseRepo. The final openliberty zip can be found in

   open-liberty\dev\cnf\release\dev\openliberty\<version>\openliberty-xxx.zip

License

Usage is provided under the EPL 2.0 license See LICENSE for the full details.