内容简介：JRuby 9.0.0.0-pre2 发布，Ruby 的 Java 解释器
JRuby 社区很高兴的宣布 JRuby 9.0.0.0-pre2 发布了：
JRuby 9000 是全新的 JRuby 版本，经过多年的开发和大规模重构子系统后推出。
JRuby 9000 的主要新特性：
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兼容 Ruby 2.2
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基于传统编译器设计的新的优化后的运行时
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新的 POSIX 友好的 IO 和进程
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来自 MRI 的完全可移植的编码和转码逻辑
Ruby 2.2 的特性中这个版本 JRuby 尚未实现的还有：
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Refinements (partially finished) #1062
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Kernel#spawn close-on-exec support
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ObjectSpace::WeakMap#each and Enumerable inclusion
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Thread#handle_interrupt is not yet fully functional
与 Pre1 版本比较，值得关注的变化是：
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Startup time has improved but is a tiny bit slower than 1.7.x.
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Memory usage has improved but still a ways to go.
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Straight-line performance has improved since pre1
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Windows support improved, but still needs further work and testing
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Many keyword arguments problems fixed
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88 issues fixed for 9.0.0.0.pre2
Truffle
JRuby 9000 包含一个开发中的支持 Truffle 语言实现框架和来自 Oracle 实验室的 Graal VM。详情请看 JRuby Wiki .
Github Issues resolved for 9.0.0.0.pre2
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#2864 - Prepend breaks module "implementer" search
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#2847 - JRuby not using UTF-8 for source files
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#2846 - Psych dependency is installing non-JRuby version
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#2842 - Hash#each_pair should be a true alias of Hash#each
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#2840 - jrubyc blows with NPE
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#2833 - Bad nonlocal return with re-wrapped define_method block
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#2797 - Support respond_to_missing? in respondsTo() lookups
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#2788 - Autoload broken by path canonicalization
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#2787 - Returns nil instead of regex match group inside conditional
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#2784 - rindex() fails on strings read from binary files
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#2777 - Undefined group option during parse of mri/test_regexp.rb
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#2776 - IR improperly masks errors in defined-guarded conditional
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#2771 - unknown type of %string
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#2767 - Open3.popen3 treats string command differently than MRI
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#2766 - Open3.capture2e fails with "wrong exec option"
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#2764 - Encoding::Converter#primitive_convert has trailing null byte
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#2752 - JRuby doesn't define Process::Tms like MRI does
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#2751 - Make RUBY_ENGINE_VERSION as companion to RUBY_ENGINE
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#2736 - early return in each'd enumerator is jumping out of each and not method
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#2726 - how do I install with Jars? Re: "deprecated. use instead jars/installer" message
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#2716 - rb_cmpint difference from MRI
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#2712 - Micro bench is nearly 2x slower with JIT than interp
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#2692 - Fix for issue 2591 on master : double-quoted UTF8 hash key encoding
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#2654 - Truffle - Compile Error until when break in case statement
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#2652 - Truffle - Regex Parsing Error
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#2637 - Produce a warning on private attribute accessors
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#2636 - Fix Bignum's bitwise operations
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#2635 - Object.const_get behaves differently from other implementations
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#2629 - Mixed-mode execution exposes an unusual bug
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#2627 - $stdin.tty? reports wrong value on JRuby-9.0.0.0-pre1
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#2623 - error with bin/jruby -S gem install asd
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#2615 - Open3 fails with ArrayStoreException after ~50 executions
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#2598 - Unknown error in child-process gem when trying to open phantomjs browser in webdriver when running on jruby
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#2593 - Fix IO#write frozen string issue in textmode
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#2591 - double-quoted UTF8 hash key has the wrong encoding
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#2589 - Fixed the errors with RubySpec
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#2587 - simplecov triggers load error when running coverage on jruby-9.0.0.0.pre1
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#2585 - JavaSupport refactoring API (byte-code) incompatibility with extensions
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#2584 - Fixed arity issue with RubyMethod
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#2583 - Make filepaths with null byte fail
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#2581 - Error handling converting UTF-32 to UTF-8 is broken [9k] [lotus]
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#2580 - Different Encoding behavior from all other Rubies
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#2579 - Fix for issue 2182 on master : Struct#inspect with utf8 encode string member
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#2578 - Binding#receiver is not implemented [9k] [lotus]
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#2576 - Fix the bug with size with each_slice without block
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#2574 - Parallel value assignment broken in IR builder (multi-value literals, calls, attr-assign, etc.)
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#2570 - ClassCastException requiring minitest with JRuby 9000
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#2569 - Fix required arguments for File.chown
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#2568 - Exit iterator when `RubyHash#any?` short-circuits
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#2562 - Skip block-to-proc conversion for explicit block syntax when possible
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#2560 - Fix uninitialized usage of File::Stat
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#2553 - Mismatch on Enumerator#size result between JRuby and MRI
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#2547 - Dir.foreach does not allow encoding
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#2541 - JRuby+Truffle: Keyword Arguments - "illegal recursive call"
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#2540 - Fixed arity require in case of required keyword arguments
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#2537 - Fix for issue 2524 on master: [BigDecimal] Loss of precision with different execution order
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#2525 - undefined method `invoke_with_build_args' for nil:NilClass on Windows 7
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#2524 - [bigdecimal] Loss of precision with different execution order
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#2523 - Modified the make_wstr method so that it appends a null character.
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#2522 - Implement pack & unpacking ipv6 address in sockaddr
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#2521 - Require order appears to impact JRuby extensions [9k]
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#2518 - Keyword arguments incompatibility
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#2514 - Getting "BUG: $! and exception are not matching up" in RSpec in 9K
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#2512 - keyword arguments incompatibilities
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#2511 - Keyword method parameters cannot take a frozen hash
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#2505 - IO.popen cannot run 'date' on Windows 7
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#2500 - gem install failure on Windows
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#2494 - Open3 fails with varying signals on 9.0.0.0.pre1
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#2493 - Performance issue with invokedynamic + Rack + URI
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#2492 - Implemented support for keyword and keywordrest proc /lambda parameters
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#2491 - Minitest rails not working on 9000
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#2489 - Proc.parameters return an empty array
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#2486 - Implemented Enumerator#feed method
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#2474 - truffle artifacts are not on maven central and we have a release repo in jruby-parent.pom
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#2466 - Package Truffle stdlib files into tarball
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#2388 - IO#ready? returns incorrect results
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#2357 - NULL handling inconsistent with Ruby
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#2312 - Encoding.compatible? affected by call order
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#2210 - Fix for issue 1069 and 1390 on master: improve handling of non ascii character after backslash
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#2185 - Bundle fails with Java::JavaLang::StackOverflowError with git-hosted gems
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#2165 - Truffle: Kill all other threads when the main thread exits
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#2163 - StringLiteral consumers may not be CR-aware
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#2137 - Socket.getifaddrs returns incorrect interface list
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#2033 - Problem with super not passing params with IR
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#2015 - Method keyword arguments are destructive
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#1982 - AIOOBE in ThreadContext#postYield
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#1395 - Pre-compiled methods do not have AST available for re-compilation
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#779 - Output unreliable from spawned processes
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