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Considering our limited human resources and time constraints, it is hard to give definitive and accurate estimates of the milestones we are going to release.

Tentative Roadmap

Groovy 1.8.x

Groovy 1.8 is our previous stable branch of Groovy. Ongoing maintenance with minor incremental improvements will be delivered throughout 2012.

Feature set

You can leanr more about the feature set by reading the Groovy 1.8 release notes.


  • Groovy 1.8-final: End of April 2011 (tick)
  • Groovy 1.8.1: End of July 2011 (tick)
  • Groovy 1.8.3: Early September 2011 (tick)
  • Groovy 1.8.4: Octobre 2011 (tick)
  • Groovy 1.8.5: End of December 2011 (tick)
  • Groovy 1.8.6: February 2012 (tick)
  • Groovy 1.8.7: July 2012 (tick)

Groovy 2.0

Groovy 2.0 is the main stable branch of the Groovy programming language. 

Feature set

Release mainly geared towards the alignments with the upcoming but delayed JDK 7.

  • work related to JDK 7
    • usage of invokedynamic and annonymous classloader (JDK7 features)
    • updates for JDK 7 language features (aka Project Coin)
  • modularity of Groovy (splitting Groovy in smaller JARs on a per feature basis) and extension modules
  • static type checking AST transform
  • static compilation AST transform


  • Groovy 1.9-beta-1: July 2011 (tick)
  • Groovy 1.9-beta-3: September 2011 (tick)
  • Groovy 1.9-beta-4: October 2011 (tick)
  • Groovy 2.0-beta-1: November 2011 (tick)
  • Groovy 2.0-beta-2: December 2011 (tick)
  • Groovy 2.0-beta-3: May 2012 (tick)
  • Groovy 2.0-rc-1: end of May 2012 (tick)
  • Groovy 2.0-rc-2: early June 2012 (tick)
  • Groovy 2.0-rc-3: mid June 2012 (tick)
  • Groovy 2.0-rc-4: end of June 2012 (tick)
  • Groovy 2.0-final: end of June 2012 (tick)
  • Groovy 2.0.1: end of July 2012 (tick)
  • Groovy 2.0.2: early September 2012 (tick)
  • Groovy 2.0.4: end of September 2012 (tick)
  • Groovy 2.0.5: October 2012 

Groovy 2.1

Groovy 2.1 is the next major version after 2.0.

Feature set

  • Completion of the invoke dynamic support, in particular usage of invoke dynamic with constructors, and properties
  • @DelegatesTo transformation for improved DSL support and static type checking
  • AST transforms aliases
    • ability to create custom annotations for specific AST transforms applications
      • for example: @Canonical could be a composite alias annotation for @ToString / @TupleConstructor / @EqualsAndHashCode


  • Groovy 2.1: end of November 2012
  • Groovy 2.1.x: January 2012

Groovy 3.0 (2013)

Feature set

  • New Meta-Object Protocol
  • Rewrite the Groovy grammar from scratch with Antlr 4 (moved to Groovy 4)
  • Retrofitting Groovy closures to accomodate JDK 8 upcoming closures for interoperability

Groovy 4.0 (2014)

Feature set

  • Rewrite the Groovy grammar from scratch with Antlr 4

Other topics we could consider for later Groovy

  • compiler related:
    • investigate the integration of the Eclipse joint compiler to replace the Groovy stub-based joint compiler
    • investigate making the groovyc compiler multithreaded
  • a treturn keyword for tail calls for closures and methods
  • Incremental compiler
  • Improved runtime performance
  • ability to pass expression trees / AST nodes as parameters (see C# 4's own expression tree)
  • lexical categories
  • a symbol concept, a bit like Ruby's :symbol, or like Java interned strings
  • co-routines and/or generators
  • tail-call recursion
  • pattern matching
  • parser combinators
  • a native template engine compiling to AST (faster, correct line numbers for error reporting, optimized outputting, etc.)
  • ...
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