# \[ruby-talk:444164\] \[ANN\] JRuby 9.4.2.0 Released **URL:** \ **Category:** ruby-talk\ **Created:** [8 March 2023 19:33 UTC](https://rubytalk.org/t/ruby-talk-444164-ann-jruby-9-4-2-0-released/76175 "2023-03-08T19:33:35Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Thomas\_E\_Enebo1](https://yyz1.discourse-cdn.com/flex029/user_avatar/rubytalk.org/thomas_e_enebo1/32/1861_2.png) [@Thomas\_E\_Enebo1](https://rubytalk.org/u/Thomas_E_Enebo1)\ **Post date:** [8 March 2023 19:33 UTC](https://rubytalk.org/t/ruby-talk-444164-ann-jruby-9-4-2-0-released/76175/1 "2023-03-08T19:33:35Z")
The JRuby community is pleased to announce the release of JRuby 9.4.2.0.   - Homepage: [https://www.jruby.org/](https://www.jruby.org/)   - Download: [Downloads — JRuby.org](https://www.jruby.org/download) JRuby 9.4.x targets Ruby 3.1 compatibility. Thank you to our contributors this release, you help keep JRuby moving forward! @k77ch7, @andsel Ruby Compatibility   - \_\_callee\_\_ now properly returns the name under which a method was called, which will be the new name in the case of aliased methods. #2305, #7702   - More use cases for keyword arguments have been fixed to behave correctly and avoid extraneous warnings. #7637, #7645, #7657, #7658, #7670, #7672, #7686   - Array#pack now supports more cases, passing nearly all specs. #7663   - Compatibility with CRuby’s command-line arguments has been improved. #7678, #7680, #7681, #7681, #7683, #7684 Standard Library   - irb is updated to 1.4.2. #7690, #7691   - open-uri is updated to 0.3.0. #7701   - io-wait is updated to 0.3.0. #7701   - stringio is updated to 3.0.5. #7701   - strscan is updated to 3.0.6. #7701   - open3 is switched to using the gem at 0.1.2. #7701 Platform Support   - Exception backtraces now default to color output when the controlling terminal is a TTY. Disable using -Xbacktrace.color=false or equivalent in .jrubyrc. #7693 Performance   - String#split has been optimized to skip regular expression use for simple split expressions. Simple ASCII strings also split faster. #7629 54 Github Issues resolved for 9.4.2.0     #2305 - \_\_callee\_\_ behaves differently from MRI     #7477 - Integer#chr(encoding: Encoding::UTF\_8) raises a different RangeError exception message than on CRuby     #7480 - Cannot call SubClass#initialize\_copy with an object created from the super class     #7615 - opt != for fixnum in JIT/indy     #7629 - Split opts     #7637 - 9.4.1.0: Wrong number of arguments with kwargs when subclassing a java class     #7639 - Typing @ into irb in 9.4.1.0 crashes it     #7641 - “Port already in use” errors when configuring remote JMX in 9.4     #7642 - [9.4.1.0] ArrayIndexOutOfBoundsException     #7643 - Use SmartBinder to set up struct calls     #7645 - Fixes #7637. Arity error with kwargs when subclassing a java class     #7650 - BigDecimal arithmetic regression [jruby-9.4]     #7652 - Fix Float#to\_d of bigdecimal/util     #7653 - Fix Struct#values\_at when passed an integer Range argument for edge cases     #7655 - JIT coverage fixes     #7656 - Regression: Class variables in top level methods broken compared to MRI & 9.3     #7657 - Pattern matching unexpectedly raises “duplicated key name” error     #7658 - remove deplicated key name error     #7659 - Fix for #7656.     #7662 - END blocks had regressed and was calling same block \>1     #7663 - Array#pack unknown directive warns     #7664 - All these work?     #7665 - Arity errors for ‘call’ things in Signal#trap     #7666 - Array#new size boundary error not tripping     #7667 - Kernel#respond\_to? return wrong error string but right error.     #7668 - Array#to\_s/inspect should be same method     #7669 - Proc#inspect with &:foo should print that out in str     #7670 - Probably method\_missing is not handling keyword arguments properly [jruby-9.4.1.0]     #7671 - Binding local\_variables makes sure they are lvars     #7672 - jruby-9.4.1.0 issues warning about duplicated keys     #7674 - Fix #7672. warning about duplicated keys     #7675 - JIT loses line numbers in some warnings?     #7678 - Add –encoding command line option.     #7679 - Spec sweep     #7680 - disabling RUBYOPT processing was not hooked up.     #7681 - Frozen string debugging off by one.     #7682 - The -p command line should use print and not puts.     #7683 - All -I provided relative paths shold be made absolute     #7684 - Fixed windowsJ encoding and do not set on invalid K values     #7685 - Add a warn form that takes a callback     #7686 - Fix #7670. Coverage data goes off the rails.     #7687 - Passing specs     #7690 - Update irb to version 1.4.2+     #7691 - Updates irb to 1.4.2     #7693 - Enable color if console is a tty     #7694 - Mimic CRuby’s range error logic for chr     #7696 - Make coderange set on strings created from some IO ops     #7700 - Define real error methods to avoid callee     #7701 - Update gems     #7702 - Encode new and old name in aliased calls     #7708 - Enumerator.new takes at most one arg     #7709 - Eliminate 2- and 3-arity paths for Enumerator#initialize     #7715 - We were quoting symbols in inspect we shouldnt have     #7716 - Add infra to support Ruby 3.1 pattern error messages. > **···** > > -- > blog: [http://blog.enebo.com](http://blog.enebo.com) twitter: tom\_enebo > mail: tom.enebo@gmail.com