JRuby 9.1.0.0 Release Notes

IN PROGRESS

JRuby 9000 is the new major version of JRuby, representing years of effort and large-scale reboots of several JRuby subsystems.

Major features of JRuby 9000:

• Ruby 2.3 compatibility, minus features listed below https://github.com/jruby/jruby/issues/3479
• A new optimizing runtime based on a traditional compiler design
• New POSIX-friendly IO and Process
• Fully ported encoding/transcoding logic from MRI

JRuby 9.1.0.0

Notable changes since 9.0.5.0

• removing default -Xmx (500MB) setting from jruby.bash. Most users that get JRuby will end up using the bash script. https://github.com/jruby/jruby/issues/3739

• Thread.new and others spawning threads (Fiber, Enumerator) should be a bit faster to start, most importantly they no longer possibly slow-down due low entropy sources on *nix systems due a Java SecureRandom instantiation on JRuby's ThreadContext. https://github.com/jruby/jruby/pull/3723

Java Integration

• Java stack-trace filtering was tuned to not exclude everything under the org.jruby package prefix, we still avoid the additional noise from the stack-trace but no longer filter potentially unknown packages (e.g. org.jruby.rack) or extension stacks (org.jruby.ext). This change also affects backtrace information on the Ruby side which might now include more .java parts.

• Warbler has had issues with pre-compiled .rb files due broken IR de-serialization logic, we expect all issues to be fixed and added specs to cover previously failing issues.

Issues/Features Resolved in 9.1.0.0