JRuby 1.7.18 发布，此版本是 JRuby 1.7.0 以来的第 21 个版本，JRuby 1.7 主要是为了解决与 Ruby 1.9.3 的兼容问题。此版本值得关注的新特性：
相关链接：
Github Issues resolved for 1.7.18#2342 - Java::JavaLang::NullPointerException: org.jruby.RubyString.crypt(RubyString.java:2660) #2331 - File.realpath treats absolute "classpath:/" paths as relative paths #2327 - added String#b method #2316 - I/O calls do not invalidate `String#ascii_only?` cache #2310 - ArgumentError: "+HH:MM" or "-HH:MM" expected for utc_offset #2307 - ConstantCompilationTest.testContainerCompilation regression #2304 - Unable to use JRuby with google app engine due to use of sun.misc.Unsafe #2302 - Update JRuby 1.7.x to latest PL and default gems #2301 - unable to get value of object's fields in RubyMine debugger #2298 - Open3.capture3 still broken in JRuby 1.7.17 #2297 - File.executable? raises an exception if the `file_path` is non-existent and native disabled #2296 - NullPointerException with JRuby 1.7.17 running rspec & simplecov in debug mode #2295 - Regexp.union [] gives wrong result in ruby 1.8 mode #2294 - String#crypt fails on Windows #2291 - Dir[] fails if path does not exist instead of returning nil #2259 - File.basename can return a string with a different encoding than the input #2172 - Symbols need to support UTF-8 names #2048 - Stat of an empty resource does not generate proper Exception. #1941 - Symlinks in load path should remain unexpanded in LOADED_FEATURES #1237 - jffi*.tmp files remain in %TMP% folder
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。 | 
