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README.md

ACME Java Client build status maven central

This is a Java client for the Automatic Certificate Management Environment (ACME) protocol as specified in RFC 8555.

ACME is a protocol that a certificate authority (CA) and an applicant can use to automate the process of verification and certificate issuance.

This Java client helps connecting to an ACME server, and performing all necessary steps to manage certificates.

It is an independent open source implementation that is not affiliated with or endorsed by Let's Encrypt.

Features

  • Mature and stable code base. First release was in December 2015!
  • Fully RFC 8555 compliant
  • Supports the http-01, dns-01, and tls-alpn-01 (RFC 8737) challenges
  • Supports RFC 8738 IP identifier validation
  • Supports RFC 8739 short-term automatic certificate renewal (experimental)
  • Supports RFC 8823 for S/MIME certificates (experimental)
  • Easy to use Java API
  • Requires JRE 11 or higher
  • Built with maven, packages available at Maven Central
  • Extensive unit and integration tests
  • Adheres to Semantic Versioning

If you require Java 8 or Android compatibility, you can use acme4j v2 instead. Version 2 is still receiving bugfixes and security updates until September 2023.

Dependencies

Usage

Announcements

Follow our Mastodon feed for release notes and other acme4j related news.

Contribute

License

acme4j is open source software. The source code is distributed under the terms of Apache License 2.0.

Acknowledgements