Bug 修复
[GROOVY-4852] - Constant Optimization is a little off
[GROOVY-4918] - GetEffectivePojoPropertySite#acceptGetProperty may produce a NullPointerException when provided with a null 'receiver' object
[GROOVY-6590] - field on primitive not recognized even if existing in wrapper type
[GROOVY-6697] - Setting property in trait using "super" doesn't work
[GROOVY-7000] - Support MarkupTemplateEngine integration with TemplateServlet
[GROOVY-7173] - jsonslurper does not unescape Strings (sometimes) on parsing with JsonParsingUsingCharacterSource
[GROOVY-7240] - Unable to start dollar slashy strings with an escaped dollar
[GROOVY-7243] - @Delegate does not honor "includes" on properties - all properties are delegated
[GROOVY-7255] - Problem With @CompileStatic And Static Trait Members
[GROOVY-7261] - @Lazy should work in combination with @Delegate
[GROOVY-7262] - There should be a TimeZone variant of the Date#parse method in DGSM
[GROOVY-7263] - Problem With Static Imports
[GROOVY-7264] - NPE in TypeResolver when access$XXX method generated for a method with generic types
[GROOVY-7266] - CompilationFailedException can be swallowed
[GROOVY-7267] - avoid hashcode based equality check without equals
[GROOVY-7269] - Problem With MetaMethods and replacing MetaProperty
[GROOVY-7273] - :doc command checks wrong api urls
[GROOVY-7275] - SelfType class "was not matched with found receiver" trait
[GROOVY-7276] - static compiler fails to eliminate dynamic property lookup
[GROOVY-7277] - TemplateResource.parse handles paths containing multiple dots incorrectly
[GROOVY-7278] - Error caused by @CompileStatic
[GROOVY-7280] - typo: 'possible loose of precision' should be 'possible loss of precision'
[GROOVY-7285] - Stackable Traits at runtime don't honor definition order
[GROOVY-7287] - Problem With Trait Generics With Conflicting Names
[GROOVY-7297] - StackOverflowError Related To Trait Generics
[GROOVY-7298] - NPE in TypeResolver using
[GROOVY-7300] - CompileStatic doesn't call property accessors on super classes correctly
[GROOVY-7302] - LazyMap size returns incorrect result for un-built maps if same key set more than once
改进
[GROOVY-6658] - Set anchors for each section in Groovy Ascii docs.
[GROOVY-7228] - Minor typo in documentation for DefaultGroovyMethods.xor(left, right)
[GROOVY-7235] - Groovysh code completion is not compatible with JDK 9 (Jigsaw)
[GROOVY-7245] - Add primitive array join()
新特性
[GROOVY-7224] - Extend @Builder InitializerStrategy to support adding the annotation to Constructors
此版本现已提供下载：
二进制：http://dl.bintray.com/groovy/maven/groovy-binary-2.4.1.zip
源代码：http://dl.bintray.com/groovy/maven/groovy-src-2.4.1.zip
Groovy是一种基于JVM的敏捷开发语言，它结合了Python、Ruby和Smalltalk的许多强大的特性。
Groovy 主要的特点包括：
是一个基于Java虚拟机的敏捷动态语言。
构建在强大的Java语言之上 并添加了从Python，Ruby和Smalltalk等语言中学到的诸多特征。
为Java开发者提供了现代最流行的编程语言特性，而且学习成本很低（几乎为零）。
支持DSL（Domain Specific Languages领域定义语言）和其它简洁的语法，让你的代码变得易于阅读和维护。
Goovy拥有处理原生类型，面向对象以及一个Ant DSL，使得创建Shell Scripts变的非常简单。
在开发Web，GUI，数据库或控制台程序时 通过减少框架性代码 大大提高了开发者的效率。
支持单元测试和模拟（对象），可以简化测试。
无缝集成 所有已经存在的 Java对象和类库。
直接编译成Java字节码，这样可以在任何使用Java的地方 使用Groovy。
在线API doc：http://tool.oschina.net/apidocs/apidoc?api=groovy
下载地址：http://www.groovy-lang.org/download.html
来自:开源中国社区