Programming language: Java
License: Apache License 2.0
Tags: Configuration    
Latest version: v4.4.1

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cfg4j ("configuration for Java") is a configuration library for Java distributed apps (and more).


  • Open source
  • Easy to use
  • Auto-reloads configuration
  • Powerful configuration mechanisms (interface binding, multi-source support with fallback strategy, merging, ...)
  • Distributed-environment friendly ( caching, support for multiple environments [test, preprod, prod], ...)
  • Reads configuration from: Consul, Git repos (YAML and/or properties), Files, Classpath, ...
  • Modern design
    • Seamless integration with DI containers: Spring, Guice and others
    • Exposes performance metrics by integration with Metrics library
    • Extensible (see the list of plugins below)
    • Heavily tested (99% code coverage)
    • Well documented
    • Java 8+ required


Read an article about configuration management using cfg4j.

Detailed documentation

Head to the documentation.

Sample apps

Explore the code of the sample apps.

Quick start

Setting up dependency


dependencies {
  compile group: "org.cfg4j", name:"cfg4j-core", version: "4.4.1"

  // For Consul integration
  compile group: "org.cfg4j", name:"cfg4j-consul", version: "4.4.1"

  // For git integration
  compile group: "org.cfg4j", name:"cfg4j-git", version: "4.4.1"


  <!-- For Consul integration -->
  <!-- For git integration -->


The fastest way to start working with cfg4j is to use a Git repository as a configuration store. To do that follow the steps:

  • Use the following code in your application to connect to sample configuration source: ```java public class Cfg4jPoweredApplication {

// Change this interface to whatever you want public interface SampleConfig { Integer birthYear(); List friends(); URL homepage(); Map grades(); }

public static void main(String... args) { ConfigurationSource source = new GitConfigurationSourceBuilder() .withRepositoryURI("https://github.com/cfg4j/cfg4j-git-sample-config.git") .build();

ConfigurationProvider provider = new ConfigurationProviderBuilder()

SampleConfig config = configurationProvider.bind("reksio", SampleConfig.class);

// Use it!



* Optional steps
    1. Fork the [configuration sample repository](https://github.com/cfg4j/cfg4j-git-sample-config).
    2. Add your configuration to the "*application.properties*" file and commit the changes.
    3. Update the code above to point to your fork.

# License
Licensed under the Apache License, Version 2.0. See LICENSE file.

*Note that all licence references and agreements mentioned in the cfg4j README section above are relevant to that project's source code only.