Project Summary
Warbler is a gem to make a .war file out of a Rails project. The intent is to provide a minimal, flexible, ruby-like way to bundle up all of your application files for deployment to a Java application server.
Warbler provides a sane set of out-of-the box defaults that should allow most Rails applications without external gem dependencies (aside from Rails itself) to assemble and Just Work.
Warbler bundles JRuby and the JRuby-Rack servlet adapter for dispatching requests to your application inside the java application server, and assembles all jar files in WARBLER_HOME/lib/*.jar into your application. No external dependencies are downloaded.
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In a Nutshell, Warbler...
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has a well established, mature codebase
maintained by a large development team
with increasing Y-O-Y commits -
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took an estimated 2 years of effort (COCOMO model)
starting with its first commit in August, 2007
ending with its most recent commit 8 days ago
Quick Reference
MIT License
Permitted
Commercial Use
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Private Use
Forbidden
Hold Liable
Required
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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 )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryJan 12 2026 — Feb 11 2026
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12 Month SummaryFeb 11 2025 — Feb 11 2026
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