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Top 7 Java SAML Projects
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Look at the example from Keycloak. In the check report, I found many seemingly minor warnings, such as this one:
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pac4j
Security engine for Java (authentication, authorization, multi frameworks): OAuth, CAS, SAML, OpenID Connect, LDAP, JWT...
Project mention: Show HN: Torii – a framework agnostic authentication library for Rust | news.ycombinator.com | 2025-02-28 -
OpenAM
OpenAM is an open access management solution that includes Authentication, SSO, Authorization, Federation, Entitlements and Web Services Security.
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play-pac4j
Security library for Play framework 2 in Java and Scala: OAuth, CAS, SAML, OpenID Connect, LDAP, JWT...
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OpenIG
Open Identity Gateway (OpenIG) is a high-performance reverse proxy server with specialized session management and credential replay functionality.
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Also worth noting that per the spec, the RelayState can only be 80 bytes.
> As well in "HTTP Redirect Binding" or "HTTP POST Binding", The RelayState value MUST NOT exceed 80 bytes
From https://docs.oasis-open.org/security/saml/v2.0/saml-bindings...
At FusionAuth, we have an open issue for this: https://github.com/FusionAuth/fusionauth-issues/issues/2467 which you can read for more details.
SAML is full of these kinds of gotchas. We have an open source library which provides Java SAML bindings: https://github.com/FusionAuth/fusionauth-samlv2
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Java SAML discussion
Java SAML related posts
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Configuring .NET APIs with Keycloak
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Getting Started with Keycloak: Understanding the Basics
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Hacking My Own AWS Account: A Tale of Legacy Systems and Modern Solutions
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Open Source Identity and Access Management
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OpenID Connect specifications published as ISO standards
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Ruby on Rails: Autenticação utilizando Devise + Keycloak
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Optimizing Keycloak Caches: Best Practices for Embedded and External Infinispan
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A note from our sponsor - SaaSHub
www.saashub.com | 21 Mar 2025
Index
What are some of the best open-source SAML projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Keycloak | 26,060 |
| 2 | pac4j | 2,459 |
| 3 | OpenAM | 807 |
| 4 | spring-boot-security-saml-sample | 564 |
| 5 | play-pac4j | 406 |
| 6 | OpenIG | 79 |
| 7 | fusionauth-samlv2 | 9 |
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