#7488 - Remove Hash index method, and fix ruby2_keywords_hash module method.#7486 - Regression in 9.4 (optimizer? JIT?).#7485 - JRuby 9.4 defines Hash#index, and defines by2_keywords_hash as instance methods.#7481 - Symbol#to_s returns a frozen String.#7479 - Cannot sub-class Zlib::GzipWriter and call.#7476 - Zlib::GzipWriter cannot be properly sub-classed.#7434 - IR compiler/interpreter bug: .operands.UndefinedValue should not be used as a valid value during execution.

#7112 - RSpec can’t match errors in jruby-9.4.0.0.

#6365 - Psych syntax error changed in JRuby 9.2.13.0.

#6297 - jruby-jars profile fails on Java 11.

#5534 - irb and rails console broken on windows 10.

The maximum IR size eligible for JIT has been increased from 1000 instructions to 3000 instructions.

Overall JIT bytecode size has been improved, allowing more methods to compile to JVM bytecode.

Final changes to support the LoongArch64 architecture have been merged in.

This version switches the JRuby extension to SnakeYAML Engine, avoiding CVEs against the original SnakeYAML and updating YAML compatibility to specification version 1.2.

The Psych YAML library is updated to 5.1.0.

Random has been fixed to work properly with SecureRandom, which was generating all zeros.

Several fixes to keyword arguments are included in this release.Thank you to our contributors this release, you help keep JRuby moving forward! also to the community of JRuby users for trying out JRuby 9.4.0.0 and filing issues! We’re proud to include so many fixes in this update release and we couldn’t have done it without your bug reports. JRuby 9.4.x targets Ruby 3.1 compatibility. The JRuby community is pleased to announce the release of JRuby 9.4.1.0.

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