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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.

IMPORTANT: Starting November 1st, 2019, all acme4j versions before v2.5 will not work properly any more. Make sure to update to the latest acme4j version in time. See here and here for details. You will find help for migrating your code in the migration guide.

Features

  • Fully RFC 8555 compliant
  • Supports the http-01, dns-01 and tls-alpn-01 challenges
  • Supports the acme-ip draft
  • Supports the acme-star draft for short-term automatic certificate renewal (experimental)
  • Easy to use Java API
  • Requires JRE 8 (update 101) or higher
  • Built with maven, packages available at Maven Central
  • Small, only requires jose4j and slf4j as dependencies
  • Extensive unit and integration tests

Usage

Contribute

License

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

Acknowledgements

  • I would like to thank Brian Campbell and all the other jose4j developers. acme4j would not exist without your excellent work.
  • Thanks to Daniel McCarney for his help with the ACME protocol, Pebble, and Boulder.
  • Ulrich Krause for his help to make acme4j run on IBM Java VMs.
  • I also like to thank everyone who contributed to acme4j.
  • JetBrains kindly provided a free open source license for IntelliJ IDEA.