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name avaje-config
description Avaje Config external configuration library. YAML/properties loading, profiles, environment variables, change listeners, AWS AppConfig. Use when working with avaje-config for application configuration.

Avaje Config

Avaje Config is a lightweight external configuration library for Java. It loads configuration from YAML/properties files, environment variables, and cloud sources like AWS AppConfig.

Key Principles

  • Config.get("key") / Config.getInt(...) / Config.getBool(...) for static access
  • Configuration interface for injectable, testable config access
  • YAML and properties file support with profile-based overrides
  • Environment variable binding
  • Runtime change listeners for dynamic configuration
  • AWS AppConfig plugin for cloud-native config management
  • GraalVM native image compatible

Task Guides

Load the relevant reference guide for the current task. Only load what you need.

Task Reference
Setup, loading, defaults setup
Profiles, env vars, cloud integration advanced
Testing, troubleshooting testing

Quick Reference

application.yaml

server:
  port: 8080
myapp:
  feature.enabled: true
  maxRetries: 3

Static Access

String value = Config.get("myapp.key");
int port = Config.getInt("server.port", 8080);
boolean enabled = Config.getBool("myapp.feature.enabled", false);

Injectable Access

@Singleton
class MyService {

  private final int maxRetries;

  @Inject
  MyService(Configuration config) {
    this.maxRetries = config.getInt("myapp.maxRetries", 3);
  }
}

Change Listeners

Config.onChange("myapp.feature.enabled", newValue -> {
  // react to runtime config change
});

Regenerating References

cd /path/to/avaje/skills && ./generate-references.sh