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  • is an agile and dynamic language for the Java Virtual Machine
  • builds upon the strengths of Java but has additional power features inspired by languages like Python, Ruby and Smalltalk
  • makes modern programming features available to Java developers with almost-zero learning curve
  • provides the ability to statically type check and statically compile your code for robustness and performance
  • supports Domain-Specific Languages and other compact syntax so your code becomes easy to read and maintain
  • makes writing shell and build scripts easy with its powerful processing primitives, OO abilities and an Ant DSL
  • increases developer productivity by reducing scaffolding code when developing web, GUI, database or console applications
  • simplifies testing by supporting unit testing and mocking out-of-the-box
  • seamlessly integrates with all existing Java classes and libraries
  • compiles straight to Java bytecode so you can use it anywhere you can use Java

Experience Groovy 2.4

Groovy 2.4 is the latest major and stable version of the popular alternative language for the JVM.

In this new release, Groovy features:

  • support for building Android applications in full Groovy!
  • performance improvements and reduced bytecode
  • traits @SelfType annotation to restrict traits application
  • many GDK improvements
  • updated AST transformations
  • Groovysh enhancements

Deprecating the wiki


We are slowly migrating documentation from the wiki to a new website. It is recommanded that you read the new documentation first, and fall back to the wiki if you can't find what you were looking for.



"Groovy is like a super version of Java. It can leverage Java's enterprise capabilities but also has cool productivity features like closures, builders and dynamic typing. If you are a developer, tester or script guru, you have to love Groovy."



A simple hello world script:

def name='World'; println "Hello $name!"

A more sophisticated version using Object Orientation:

class Greet {
  def name
  Greet(who) { name = who[0].toUpperCase() +
                      who[1..-1] }
  def salute() { println "Hello $name!" }

g = new Greet('world')  // create object
g.salute()               // output "Hello World!"

Leveraging existing Java libraries:

import static org.apache.commons.lang.WordUtils.*

class Greeter extends Greet {
  Greeter(who) { name = capitalize(who) }

new Greeter('world').salute()

On the command line:

groovy -e "println 'Hello ' + args[0]" World


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Latest news [more]

The Groovy development team is happy to announce the joint releases of the Groovy 2.4.1 and Groovy 2.3.10 of the Groovy programming language for the Java platform.

Both releases are bug fix releases, and while Groovy 2.4.1 is the latest official stable branch, we thought it might be helpful to some projects who are still on the 2.3.x line to get a final release for that branch. But going forward, the 2.3.x branch won’t see any upcoming release.

You can learn more about all the tickets closed by reading:

For reference, you can also read the release notes of Groovy 2.4 if you haven't had a chance to since the announcement.

Head over to the download section of the new Groovy website to download the binary distribution, or update your dependencies accordingly with those new version numbers.

Thanks a lot for all those who contributed to this release!


  1. Hi,

    I am unable to get the example that you have posted on InfoQ for using the tripple dot notation of variable args list. i.e I cut and pasted the following code

    into groovyconsole and I get the following:

    Exception thrown: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, Script14: 1: unexpected token: ... @ line 1, column 21.
    1 error
    org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, Script14: 1: unexpected token: ... @ line 1, column 21.
    1 error

    Am I missing something?



  2. Vimal,

    I tried it, but now i get another error:

    groovy.lang.MissingMethodException: No signature of method: java.lang.Integer.size() is applicable for argument types: () values: {}
    	at Script14.sum(Script14:3)
  3. Vimal, try this:

  4. Oh,in Groovy1.6.0b2,  following line CAN'T run:

    $groovy -e "println 'Hello ' + args[0]" World

    Caught: groovy.lang.MissingPropertyException: No such property: args for class: script_from_command_line

    It's just on groovy's HOMEPAGE !

  5. James, this is a known problem, and a JIRA issue was raised.

    This regression will be fixed for Groovy 1.6-rc-1.

    Sorry for the inconvenience.

  6. Thanks glaforge.  I've fixed my Groovy 1.6b2 with your method. Open source is great!

  7. What about shortening the names for things in Groovy? like Maven has the mvn command.


    groovy => gv

    groovyc => gvc

    groovysh => gvsh

    groovlet script => gvp (isn't it sort of  jsp like stuff?)


    (then rewrite the old ones to call the new-names for backward compatibility)

  8. (9/24/2009 - fixed blog so that the linked entry displays properly in web browser)

    There are times when we need to read a single record at a time from a file.
    Eg., if we want to stop reading a file at a certain point.
    Or when working with more than one file. After comparing records, one might have to read a record from one or the other file, or from both.

    I was not able to find good documentation on how to do this.
    By spending a lot of time searching and experimenting, I was able to find out how to do it.


     Note that it requires two executions of .readLine for each record, but that is easy to get around, but putting it in a closure, as shown. This would usually be done anyway, to include things like record counts and end-of-file logic. So in a real program, each readALine closure would have two readLine statements.

  9. When I put the following in my initialization routine, highValue was undefined elsewhere
         String highValue = '\377'

    So I changed the code to the following two lines, which worked
         String highValue2 = '\377'
         highValue = highValue2

    When I replaced these two lines by the following, it was again undefined elsewhere
         public String highValue = '\377'

    Is there a way to define a global typed variable with a single statement?