jruby/jruby

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

3915 stars · 946 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

JRuby is an implementation of the Ruby programming language that runs on the Java Virtual Machine. It offers true parallelism without a global interpreter lock, tight Java interoperability, and can be embedded as a scripting language in Java applications.

Use cases

• run ruby on the jvm
• faster ruby implementation
• use java libraries from ruby
• embed ruby scripting in a java application
• true multithreaded ruby without gil
• run rails on the jvm

When to choose

• you want Ruby performance and real parallel threads on the JVM
• you need to call Java classes or embed Ruby inside Java apps
• you want platform-independent Ruby deployment with a JRE 21+

When to avoid

• you need C-extension gems that rely on MRI's native API
• you have no JVM available or want a minimal runtime footprint
• you depend on the very latest Ruby features before JRuby adds compatibility

Facets

cli-tool · maturity active

interpreter programming-language concurrency developer-tools programming-languages cross-platform developer-tools jvm cross-platform windows cli ruby jruby jvm-language language-implementation java-interop no-gil parallelism jvm linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="jruby/jruby")