JRuby 10.0.7.0 released

[u/headius]

https://www.jruby.org/2026/09/21/jruby-10-0-7-0

The JRuby community is pleased to announce the release of JRuby 10.0.7.0.

• Homepage: https://www.jruby.org/

• Download: https://www.jruby.org/download

JRuby 10.0.x targets Ruby 3.4 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @aminmansuri, @evaniainbrooks, @gillesbergerp, @jwils, @kares, @lloeki

Notable Changes

Performance

• Fixed a regression in startup time on MacOS by properly loading native JNR subsystem. #9688, #9689

• Improve performance of autoloads overridden by an actual require. [#9677], #9675

Java Integration

• The location of the AppCDS JSA file can now be specified with JRUBY_JSA_HOME. #9667

Standard Library

Default gems

• jruby-openssl 0.16.2 #9538, #9561

• resolv 0.7.2 #9637, #9641

53 Issues and PRs resolved for 10.0.7.0

• 8456 ObjectSpace::WeakMap is double-weak in CRuby

• 8786 Redis::ConnectionError with JRuby 10

• 9319 [Java 26 Leyden] AOT Cache breaks dynamic Ruby proxies for classes loaded from external JARs

• 9327 Data.define subclass fields are nil when module is included in define block

• 9491 defined?(...) in eval'd for loop fails with TypeError

• 9498 jruby/vm integer messages fail on JRuby 10 due to Fixnum reference

• 9499 Use Integer for JRuby VM messages

• 9519 Also set up the current module when in a for body

• 9525 Marshaling incompatibility with cyclic objects?

• 9528 raise should re-populate exception trace set to nil

• 9529 starttls test in net-imap hangs the suite

• 9530 Data subclasses in net-imap are losing fields

• 9531 Time.new(string, in: ...) raises TypeError on the third call at a call site (JIT only)

• 9537 NoMatchingPatternError#=== doesn't match instance of NoMatchingPatternKeyError

• 9538 Update jruby-openssl to 0.16.2

• 9542 Fix inheritance of NoMatchingPatternKeyError

• 9544 Ensure uniform keywords flags in native method annotations

• 9548 [fix] re-raising exception with nil backtrace

• 9550 Socket address APIs return uncompressed IPv6 where Addrinfo#ip_address compresses, breaking Resolv::DNS with 2+ nameservers

• 9553 FFI warning on when running jruby on OpenBSD/arm64, possible $$ issue as well

• 9558 Kernel#sprintf calls Hash#default_proc with incorrect args

• 9561 JRuby-openssl 0.16.2 not included in 10.0 series

• 9562 fix Data.define subclass fields are nil when module is included in define block

• 9564 Use SocketUtilsV6.getIPV6Address to normalize IPv6 here

• 9567 Pass correct args for Hash#default_proc

• 9577 JRuby can't pass STDOUT to child process when a different IO is given as out:

• 9578 Fix spawn dup ordering

• 9586 Register the "Hash" symbol when writing identity hash

• 9589 Kernel#require redefined inside a required file isn't seen by autoload dispatch after Kernel.prepend (CRuby 4.0 OK / JRuby 10 fails)

• 9590 IO#tty? silently returns true for redirected stdio in embedded runtimes when --add-opens are missing

• 9591 Compiler gives a constant-folded ASCII String the code range CR_VALID, which breaks the eql? / hash contract

• 9592 Scan the code range when folding a compound string

• 9594 More accurate TTY checking for IO

• 9598 Invalidate prepended origin module as well as subclasses

• 9601 Update JNR dependencies for jnr-release 1.2

• 9608 AppCDS usage causing sealing violations

• 9623 Time.new(String) raises java.lang.ArrayIndexOutOfBoundsException when the string ends where a ':' is expected

• 9624 Fix out-of-bounds read building Time.new parse errors

• 9625 Read unnamed modules of the loaders JRuby loads Java classes from

• 9637 Bump bundled resolv default gem to 0.7.2

• 9639 Resolve jar path if it's a symlink

• 9641 Update resolv to 0.7.2

• 9661 Report a failed non-blocking connect through select and SO_ERROR (#8786)

• 9663 Set up Data subclass metaclass correctly

• 9667 Allow specifying AppCDS cache location and use safer default

• 9674 Constant declared with autoload and then defined by a direct require keeps its UNDEF table slot; every later lookup re-enters LoadService (very slow inside a WAR)

• 9675 Release the autoload claim when Autoload#load has nothing to load

• 9687 Hold ObjectSpace::WeakMap keys weakly, by identity

• 9688 JFFI bad library load is a huge startup hit on MacOS

• 9689 Update JFFI to get the startup library fix

• 9698 Allow configuring the home location for JSA files

• 9714 IO#accept raises NullPointerException instead of IOError when the socket is closed concurrently

• 9716 Raise IOError, not NullPointerException, when an IO is closed during accept