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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 1.7.x


  • incremental bug fix releases through 2010 and early 2011

Groovy 1.8.x

Feature set

Here are a few topics we're considering for Groovy 1.8 and beyond.

  • internal runtime optimization for better performance
  • extended command expression (GEP-3) for nicer Domain-Specific Languages capabilities
  • extended annotations (closures parameters)
  • more functional aspects to closures (currying, trampoline, memoization)
  • support for joint compilation of AST transformations
  • modularity of Groovy (splitting Groovy in smaller JARs on a per feature basis)
  • native JSON builder / parser


  • Groovy 1.8-beta-1: July 2010 (tick)
  • Groovy 1.8-beta-2: September 2010 (tick)
  • Groovy 1.8-beta-3: December 2010 (tick)
  • Groovy 1.8-beta-4: Early February 2010
  • Groovy 1.8-RC-1: Mid-February 2011
  • Groovy 1.8-RC-2: End-February 2011
  • Groovy 1.8 GA: Early March 2011

Groovy 1.9

Feature set

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

  • work related to JDK 7


  • Groovy 1.9-beta-1: April
  • Groovy 1.9-beta-2: June
  • Groovy 1.9-beta-3: September
  • Groovy 1.9-RC-1: Early October
  • Groovy 1.9-RC-2: End of October
  • Groovy 1.9 GA: November

Groovy 2.0

Feature set

  • New Meta-Object Protocol
  • Incremental compiler
  • Improved runtime performance
  • Retrofitting Groovy closures to accomodate JDK 8 upcoming closures for interoperability

Other topics we could consider for Groovy 1.8, 1.9, 2.0 and beyond

  • 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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