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The JRuby community is pleased to announce the release of JRuby 9.4.6.0.

• Homepage: https://www.jruby.org/
• Download: 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! @evaniainbrooks, @ahorek, @kares, @most00, @ntkme, @sk757a

Ruby Compatibility

• Support for the new Prism parser for Ruby code has been merged in. A blog post will follow soon. #8103
• IO#fcntl had inverted logic for setting O_NONBLOCK (setting it cleared the value, etc). [#8081], [#8090]
• Many fixes to language and core class compatibility, see issue list.
• Warnings should match verbosity levels of CRuby, with many unwanted warnings now properly omitted without verbose enabled. #7183, #8071

Standard Library

• json is updated to 2.7.1. #7752, #7954
• io-console is updated to 0.7.2. This version fixes IRB on Apple M-series by using stty for console manipulation. #8012
• nkf is now supported by gem version 0.2.0. #8077
• strscan is updated to 3.1.0. #8074, [#8086]
• reline is updated to 0.4.2 #8102
• jruby-openssl is updated to 0.14.3 #8107

JVM Integration

• Ruby Symbols can be use as arguments to JVM methods that receive Java String. #8015, #8057
• Starting with Java 17, package-private methods will no longer be bound automatically even if they can be made visible. #8061, #8093

Native Integration

• The subsystem used for native calls has been updated to support RHEL/CentOS 7 and the Java 9+ Cleaner API. [#8104]

Performance

• Performance of keyword argument handling has been improved. #8021
• Pattern matching is now supported in JRuby’s JIT compiler. #8026, #8027

77 Github Issues resolved for 9.4.6.0

• #4808 Rework global variables, caching to eliminate race conditions
• #6430 Using <internal: for core library methods defined in Ruby
• #7151 File.identical? should use stat to compare files
• #7183 Various alias forms warn on redefine when they should not
• #7523 Define IO::READABLE, WRITABLE, PRIORITY for IO#wait
• #7695 jffi ships with binaries requiring glibc 2.27
• #7721 jirb on win10 : The signal TSTP is in use by the JVM and will not work correctly on this platform
• #7729 Sock fixes
• #7752 Update JSON gem to not use Bigdecimal.new
• #7759 irb on CentOS7, JRuby 9.4.2.0 , and JDK 1.8
• #7760 Failure to load FFI gives an outdated message
• #7845 Including a module again after prepending another module to it isn’t idempotent
• #7862 Ruby 2.7 conformance: ObjectSpace::WeakMap is broken for FixNum keys
• #7939 Yaml exception when trying to install rdoc-data
• #7954 Update json for BigDecimal.new fix
• #7958 Prepend internal marker to internal sources
• #7974 [ji] support java_alias with constructor
• #7981 Less instrs
• #7996 Add %aA for printf and friends
• #8001 Fix various specs
• #8002 Time spec fixes
• #8003 Fix issues in global variable thread-safety
• #8005 New MRI test failures on less common architectures
• #8007 Fix intermittent fails in CI
• #8009 Expand WeakMap to allow floats and fixnums
• #8010 Kernel#send does not strip off empty keywords hashes before calling eventual method
• #8011 Fixes #8010. Kernel#send + empty kwargs hash error
• #8012 Update io-console
• #8013 Tag sweep2
• #8014 Fixes language specs involving blocks/yield
• #8015 Java method lookup for arity-1 method with inexact argument fails in the presence of arity-2 method with same name
• #8016 Lang specs
• #8021 Reduce overhead of kwargs for no-arg methods and blocks
• #8022 Remove implicit prologue state to methods/blocks if that state is unused
• #8026 Full JIT support for pattern matching
• #8027 Pattern jit
• #8031 Reuse thread-local jump exceptions to avoid construction
• #8033 Implement Exception.to_tty?
• #8039 Implement Exception.to_tty?
• #8040 Match Exception#full_message with MRI 3.2
• #8045 Try to find class resource to avoid exception
• #8046 Socket::IFF_* are missing
• #8047 add socket flags for zeroconf
• #8048 Try and make UDP look a little more like MRI (and hopefully make it more functional)
• #8049 Fix String#unpack from using capacity() and causing wrong error
• #8050 Various cleanups for String operations
• #8052 ignore codes logic was not doing anything in unpack
• #8053 More arity splitting
• #8054 A bit confusing error: “FrozenError: can’t modify frozen NilClass”
• #8055 override getDelegate in PrependedModule to return origin
• #8056 Add hex exponential notation for Kernel::Float
• #8057 recognize RubySymbol as assignable to String
• #8060 Inspect frozen object for error
• #8061 enumerable.map raise wrong number of arguments only when Ruby script is executed from Gradle using JDK 21
• #8063 Fix typos in cli options
• #8070 Attribute definition on singleton should call singleton_method_added
• #8071 Update some warnings to deprecated
• #8072 Added Module#refinements and Refinement#refined_class
• #8074 Update strscan to fix improper sharing
• #8077 Switch to default gem for nkf
• #8080 [fix] avoid Class#subclasses deprecation with class.rb ext
• #8083 (master) rdoc test suite failing with Java::JavaLang::ArrayIndexOutOfBoundsException
• #8088 Update strscan to 3.1.0 for OOB fix
• #8091 Ripper is not returning unary minus with proper symbol
• #8093 Rework visibility checks for Java integration
• #8095 Tweak kwargs logic to improve JIT inlining
• #8099 [ji] fix java_import when constant exists in Object
• #8100 Extra splat instr which did nothing
• #8101 Flip File.identical? logic to try native first
• #8102 Update reline to 0.4.2
• #8103 Prism pluggable integration work
• #8105 Update JNR dependencies
• #8107 update jruby-openssl to 0.14.3
• #8108 fix undef_method error message
• #8109 Simple error string mismatch. Also corrected for m17n naming to prin…
• #8110 Re-arrange indexerror string when matching group name cannot be found
• #8111 NameError and NoMethodError should be dup’ing receiver