内容简介：JRuby 9.0.1.0 发布，Java 的 Ruby 解释器
JRuby 社区很高兴地宣布的 JRuby 9.0.1.0 发布。JRuby 9000 是最新的主流版本，兼容 Ruby 2.2.x，而 JRuby 9.0.1.0 是首个维护版本。
与 9.0.0.0 版本比较，该版本改进包括：
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Reduced memory usage since 9.0.0.0 by 13%
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Improved support for refinements; 70% of CRuby tests passing
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jruby-openssl updated to version 0.9.11
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psych updated to version 2.0.15
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44 issues fixed for 9.0.1.0
完整 issue 列表：
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#3288 - 9K seems to be handling all jruby.xxx properties
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#3284 - Spec improvements
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#3283 - Not getting SIGCHLD when a child process dies
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#3277 - Spec improvements
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#3276 - Class with prepended module is its own superclass
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#3271 - bigdecimal & bigmath
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#3265 - Updates for RSpec 3
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#3251 - jruby: warning: unknown property jruby.{memory,stack}.max
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#3249 - Socket.send freezes string unexpectedly (RuntimeError: can't modify frozen string)
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#3248 - File.fnmatch doesn't match german vowels
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#3245 - Parser fails on `assert_equal(true, (not ()))` expresion
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#3238 - Fix Digest bubblebabble incorrect output on empty string
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#3237 - $! gets unset by rescue, even when the rescue doesn't catch the error
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#3233 - Rails.root set to "uri:classloader:/" for new Rails app with JRuby 9.0.0.0
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#3228 - Fix an embedded runtime memory leak in Java7ClassValue
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#3227 - Array#uniq behavior differs from MRI with BasicObject members
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#3224 - removed unused FileIO class from persistence.util
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#3221 - big decimal parser
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#3220 - RubyInstanceConfig#setupEnvironment throws AccessControlException on Windows
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#3218 - add to_h to the class used for ENV
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#3211 - bignum speedup
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#3200 - Fixing RangeError with code from 1.7 branch
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#3198 - licensing information out of date?
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#3189 - 9k fail ftp on Windows
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#3188 - jruby-1_7 merge failures on master
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#3187 - Add MRI test for proc visibility
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#3175 - 9k fail to compile ruby code of using multibyte char on Windows
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#3174 - ensure clause is executed before begin clause ends ?
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#3173 - Can't reference the proc itself in a proc
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#3165 - Fix RubyRange#initialize_copy mistakenly erroring on #dup'ing a range
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#3163 - dup on Range regression
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#3162 - Different results for `to_h` and `to_hash` on `ENV`
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#3118 - Jruby 9000 RC1 throws Java::JavaLang::ClassCastException: org.jruby.RubyBignum cannot be cast to org.jruby.RubyFixnum
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#2956 - bubblebabble is wrong for empty strings
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#2901 - Psych fails with MBC strings in ASCII-8BIT
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#2148 - BigMath.log fails MRI 2.2 tests
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#2131 - Divergent behavior in MRI vs JRuby wrt Class::undef
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#1968 - JRuby Yaml implementation (psych) fails dumping "-."
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#1907 - Frozen
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#1900 - "invalid byte sequence in UTF-8" after String#encode!; behavior differs from MRI (JRuby-1.7.13)
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#1877 - Array#delete_if - no size update
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#1770 - Wrong julian day for DateTime with a negative rational offset
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#1328 - Encoding of symbol literals does not respect the encoding of the source file
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#378 - Need ability to set Socket.setReuseAddress() in RubyTCPSocket.java
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。
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