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New features and improvements in Groovy 1.7:
<ul>
	<li>Anonymous Inner Classes and Nested Static Classes</li>
	<li>Annotation enhancements</li>
	<li>Grape enhancements</li>
	<li>Power Asserts</li>
	<li>AST enhancements: AST Viewer and AST Builder</li>
	<li>Ability to customize the Groovy Truth</li>
	<li>Dependency upgrades</li>
	<li>Rewrite of GroovyScriptEngine</li>
	<li>GroovyConsole enhancements</li>
	<li>SQL batch updates and transactions</li>
	<li>More details: <a class="confluence-link" href="/display/GROOVY/Groovy+1.7+release+notes" data-linked-resource-id="126320769" data-linked-resource-type="page" data-linked-resource-default-alias="Groovy 1.7 release notes" data-base-url="http://docs.codehaus.org">Groovy 1.7 release notes</a></li>
</ul>

New features and improvements in Groovy 1.6:
<ul>
	<li>Great runtime performance improvements</li>
	<li>Multiple assignments- optional return in if/else and try/catch blocks</li>
	<li>AST transformations and all the provided transformation annotations like @Singleton, @Lazy, @Immutable, @Delegate and friends</li>
	<li>The Grape module and dependency system and its @Grab transformation</li>
	<li>Various Swing builder improvements, thanks to the Swing / Griffon (<a class="external-link" href="http://griffon.codehaus.org" rel="nofollow">http://griffon.codehaus.org</a>) team</li>
	<li>As well as several Swing console improvements</li>
	<li>The integration of JMX builder</li>
	<li>JSR-223 scripting engine built-in</li>
	<li>Various metaprogramming improvements, like the EMC DSL, per-instance metaclasses even for POJOs, and runtime mixins</li>
	<li>More details: <a href="http://www.infoq.com/articles/groovy-1-6">Infoq</a></li>
</ul>

New features and improvements in Groovy 1.5:
<ul>
	<li>Integrates Java 5 features: annotations, generics, static imports and enums</li>
	<li>New meta-programming capabilities</li>
	<li>A few syntax enhancements have also found their way into it to help ease the development of Domain-Specific Languages</li>
	<li>Groovy's Swing builder support, to help you build Swing UIs, has almost completely been rewritten and spiced up with several useful additions</li>
	<li>A great attention to performance improvements made this new version much</li>
	<li>A joint Java / Groovy compiler to let you mix and match Groovy and Java classes in the same compilation step</li>
	<li>A GroovyDoc equivalent to JavaDoc lets you document your Groovy classes</li>
	<li>A rewritten interactive shell is now really interactive and provides useful command completions for making you more productive</li>
	<li>The Groovy Swing console has also been improved</li>
	<li>More details: <a href="http://www.infoq.com/articles/groovy-1.5-new">Infoq</a></li>
</ul>