JRuby 1.6.7 更新版本发布了，该版修复了Ruby 1.9 的一些兼容性问题，在性能方面也有不少改善，值得关注的变化有：
- Fix circular require issue in Rubygems introduced by our Maven gem support
- Fix regression in popen* where streams get prematurely closed
- Many 1.9-mode encoding bugs fixed in String, Regexp, StringIO, and YAML
- Win32OLE now works in 1.9-mode
- ffi on Win x64 now knows about basic types :size_t
- Use jzlib to fix a set of issues with out zlib library
- Reduced internal locking based on user reports
- C extensions work on OS X again
- Gems with gemspecs which contain UTF-8 multi-byte chars install in 1.9 mode
完整的列表请看：full list of resolved issues
JRuby是面向Ruby、基于Java虚拟机(JVM)的一种解释程序，它结合了Ruby语言的简易性和功能强大的JVM的执行机制，包括与Java库 全面集成。Rails彻底加快及简化了Web应用的开发，不过它让人觉得不够成熟，特别是在高端企业级功能方面。另一方面，Java平台及其虚拟机、库和 应用服务器的速度、稳定性和功能方面却一直在提升，现在已被公认为是开发高端服务器应用的领先平台。不过如果Java平台不与Ruby等新兴语言联系在一 起，就有可能落后于流行趋势。
示例代码:
require "java"
include_class "java.util.TreeSet"
include_class "com.example.CallMe"
include_class "com.example.ISpeaker"
puts "Hello from ruby"
set = TreeSet.new
set.add "foo"
set.add "Bar"
set.add "baz"
set.each { |v| puts "value: #{v}" }
cm = CallMe.new
cm.hello
$globalCM.hello
class CallJava
include ISpeaker
def initialize
super
@count = 0
end
def say(msg)
puts "Ruby saying #{msg}"
end
def addOne(from)
# m.synchronize {
@count += 1
puts "Now got #@count from #{from}"
# }
end
end
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下载地址：http://jruby.org/download
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