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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.

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.

Note: Make sure to use acme4j 2.5 or higher, before November 1st 2019. Due to a change in the ACME protocol, acme4j < 2.5 will fail to connect to servers after that date. acme4j v1 is not affected. See here for details.

Features

  • Fully supports the ACME v2 protocol up to draft 18
  • 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