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 20 days ago
Quick Reference
MIT License
Permitted
Commercial Use
Modify
Distribute
Sub-License
Private Use
Forbidden
Hold Liable
Required
Include Copyright
Include License
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 SummaryDec 11 2025 — Jan 10 2026
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12 Month SummaryJan 10 2025 — Jan 10 2026
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