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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.

Groovy 2.

...

3

Groovy 2.1 3 is the latest stable version of Groovy.

Feature set

...

  • official support for running Groovy on JDK 8
  • traits, as a new object oriented way of composing behavior in your classes
  • new and improved AST transformations like @TailRecursive@Builder and @Sortable
  • a new NIO2 module with Path support
  • lightening fast JSON parsing and building
  • closure parameter type inference
  • a new markup template engine
  • Groovysh and GroovyConsole ease of use improvements
  • a new GroovyAssert test utility
  • more @BaseScript class capabilities, and more.

Releases

  • Groovy 2.1 3 beta: end of December 2012 (tick)February-March 2014
  • Groovy 2.1 RC: early January 2013 (tick)3 release candidates: April 2014
  • Groovy 2.1 final: end of January 2013 (tick)

Groovy 2.2 (mid 2013)

Feature set

  • Class-loading-less compilation 
    • using ASM when needed, to avoid loading/initializing classes needed during the compilation
  • Stub-less joint compilation
    • to avoid various problems with the stubs and the various compilation phases
  • Static traits or mixins
    • but dependent on stub-less joint compilation issues

...

  • 3 finale: May 2014 

Groovy 3.0 (

...

Q4 2014)

Feature set for consideration

  • New Meta-Object Protocol dedicated dedicated 
    • to fully leverage "invoke dynamic" (method handles, class values, etc)
    • make the sedimented dynamic features more coherent
    • to fix the private visibility conundrum 
    • to shield libraries from "monkey patching" with a notion of "realm"
  • Rewrite the Groovy grammar from scratch with Antlr 4 (moved to Groovy 4)
  • Retrofitting Groovy closures to accommodate JDK 8 upcoming closures for interoperability

Groovy 4.0 (2014)

Feature set

  • Rewrite the Groovy grammar from scratch with Antlr 4
    • in particular adapt to the Java 8 language features
      • lambdas
      • method references
      • default methods in interfaces
      • annotations on types
      • repeated annotations
  • Java 8 / JDK 8 support
    • lambdas
    • method references
    • default methods in interfaces
    • annotations on types
    • repeated annotations
    • stream API
    • date / time API

Releases

  • Groovy 3.0 alpha: Q3 2014
  • Groovy 3.0 betas: Q4 2014 - Q1 21015
  • Groovy 3.0 release candidates: Q1 2015
  • Groovy 3.0 final: end of Q2 2015

Groovy 4.0 (Q4 2015)

Feature set for consideration

  • No concrete plans at the moment

Other topics we could consider for later Groovy

  • add static "trait" capabilitiestrue named arguments
  • compiler related:
    • investigate the integration of the Eclipse joint compiler to replace the Groovy stub-based joint compilerinvestigate making the groovyc compiler multithreaded
    • Incremental compiler
  • a treturn keyword or dedicated AST transformation for tail calls for closures and methods
  • 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
  • pattern matching
  • parser combinators
  • a native template engine compiling to AST (faster, correct line numbers for error reporting, optimized outputting, etc.)
  • ...