Project Summary
JRuby is an 100% pure-Java implementation of the Ruby programming language.
JRuby is the effort to recreate the Ruby interpreter in Java. JRuby is tightly integrated with Java to allow both to script any Java class and to embed the interpreter into any Java application.
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In a Nutshell, JRuby...
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has a well established, mature codebase
maintained by a very large development team
with stable Y-O-Y commits -
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took an estimated 260 years of effort (COCOMO model)
starting with its first commit in September, 2001
ending with its most recent commit 4 days ago
Quick Reference
Common Public License 1.0
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These details are provided for information only. No information here is legal advice and should not be used as such.
GNU General Public License v2.0 or later
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These details are provided for information only. No information here is legal advice and should not be used as such.
MIT
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Use Patent Claims
Forbidden
Sub-License
Hold Liable
Required
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
Include Install Instructions
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
Project Vulnerability Report
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30 Day SummaryJan 16 2026 — Feb 15 2026
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12 Month SummaryFeb 15 2025 — Feb 15 2026
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