JRuby

JRuby is an implementation of the Ruby programming language that runs on the Java Virtual Machine (JVM), allowing Ruby code to execute within Java environments. It provides full compatibility with Ruby syntax and libraries while enabling integration with Java classes and frameworks. This makes it a bridge between Ruby's dynamic scripting capabilities and Java's robust, enterprise-grade ecosystem.

Also known as: JRuby, JRuby on Rails, JRuby interpreter, Ruby on JVM, Java Ruby

Why learn JRuby?

Developers should learn JRuby when they need to leverage Ruby's productivity and expressiveness in Java-based projects, such as enterprise applications, web services, or systems requiring Java libraries. It is particularly useful for integrating Ruby scripts into existing Java codebases, accessing Java APIs directly, or deploying Ruby applications on JVM servers like Tomcat or JBoss. Use cases include building web applications with Rails on Java servers, scripting for Java tools, or creating polyglot applications that combine Ruby and Java components.

Learning Resources

• docs: JRuby Official Documentation
• tutorial: JRuby Tutorial on Baeldung
• book: JRuby: The Ruby Programming Language on the Java Virtual Machine (Book)
• video: JRuby Introduction Video by JRuby Team