[Meta] Upgrade code and plugins to Jruby 9.4

[jsvd]

https://www.jruby.org/2022/11/23/jruby-9-4-0-0.html
The release of JRuby 9.4 represents a leap forward to Ruby 3.1 compatibility

Ruby Compatibility

• Compatibility is updated to Ruby 3.1 level. This includes all Ruby 2.7, 3.0, and 3.1 features except where noted below. (#6464, #6878, #7015)

  • Ractor is not yet supported. JRuby users can achieve better parallelism by using threaded libraries and frameworks.
  • The scheduler interface for IO, locks, and fibers is not yet supported. It will be added in an update release.

• Nearly all features from CRuby’s NEWS file have been implemented. Most new tests and specs pass.

• Remaining 3.0 and 3.1 features will be implemented in an update release. See #7459 and #7460.

Standard Library

• Much of the standard library has moved out to gems, and JRuby supports a large subset of these gems. See lib/pom.rb for the complete list of default and bundled gems.
• Greatly improved PTY and spawn support thanks to the subspawn gem, which is included as part of the standard library. #7393

JVM Integration

• Java setFoo methods that do not match JavaBean standards (return value other than void, for example) will now also generate a foo= method when imported into Ruby. (#7340, #7352)

Platform Support

• The JRuby launcher script has been ported to POSIX shell (/bin/sh) and no longer requires Bash. (#7024)
• Initial support for the LoongArch64 platform has been inherited from the Java Native Runtime libraries.

Third-party Libraries and Frameworks

• Initial support for Rails 7. SQLite and MySQL are largely functional, but work remains to update the m and PostgreSQL.

Tasks

Beta Give feedback

1. Update to JRuby 9.4 #14861
   JRuby 9.4 +1
   
2. [Maintenance] Update to Bundler 2.4 #14945
   JRuby 9.4 enhancement +2
   
3. [Maintenance] Test all tier 1 and tier 2 plugins against JRuby 9.4 #14996
   85 of 85
   JRuby 9.4 +1
   
4. Check bin/logstash -i irb works properly and doesn't break the shell on exit, there is an existing issue for this in JRuby 9.4.2.0: irb error on Mac M1 jruby/jruby#7740 (published with JRuby 9.4.3.0). It happens also on JRuby 9.4.3.0 Hard to debug path issue in environment affects jruby 9.4 zip  jruby/jruby#7727
5. Switch Logstash to JRuby 9.4 #15113
   Team:Logstash +1
   
6. Create a script to unit test all supported plugins #15160
   JRuby 9.4 tests-infra +2
   

Plugin Updates

Beta Give feedback

1. Make the plugin compatible with JRuby 9.4 (Ruby 3.1) logstash-plugins/logstash-integration-jdbc#133
   +0
   

[roaksoax]

Closed as complete.