JRuby 10.1: Experimenting and Evolving

@aminmansuri

The JRuby community is pleased to announce the release of JRuby 10.1.2.0.

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

JRuby 10.1.x targets Ruby 4.0 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! [@aminmansuri], [@drzaiusx11], [@evaniainbrooks], [@gillesbergerp], [@jcharaoui], [@jwils], [@kares], [@lloeki], [@makenowjust], [@nobu], [@sampokuokkanen], [@shugo]

Notable Changes

Compatibility

Multiple fixes for fibers and fiber scheduler support. #9604, #9607, #9622, [#9645], [#9649], [#9656], [#9660]

Performance

Fixed a regression in startup time on MacOS by properly loading native JNR subsystem. [#9690]
Improve performance of Ruby subclasses of Java classes. #9619, #9557
Improve performance of autoloads overridden by an actual require. [#9677]

Standard Library

Update to jar-dependencies 0.6.1 using mima for dependency resolution instead of the ruby-maven gem. #9515, [#9720]
Update default and bundled standard library gems. [#9705]

Default gems

erb 6.0.7
error_highligh 0.7.2
ffi 1.17.4
io-console 0.9.4
ipaddr 1.2.9
json 2.21.2
net-protocol 0.4.0
pp 0.6.4
psych 5.5.0
resolv 0.8.0
strscan 3.1.8
syntax_suggest 3.0.0
timeout 0.6.1
win32-registry 0.1.2

Bundled gems

bigdecimal 4.1.2 (ruby parts only)
csv 3.3.6
minitest 5.27.0
net-imap 0.6.7
nkf 0.3.0
pstore 0.2.1
rdoc 7.2.0
reline 0.7.0
resolv-replace 0.2.0
rss 0.3.3
test-unit 3.7.8

76 Issues and PRs resolved for 10.1.2.0

#287 Class does not inherit singleton_class's class methods
#6119 shopify-api gem reporting NoMethodError: undefined method `threadsafe_attribute'
#8743 IO#wait updates for Ruby 3.2-3.4
#9026 JRuby --help fails if PAGER has an option
#9301 Find an alternative to shipping ruby-maven
#9403 add keyword arg support to callMethod directly
#9441 Fix original_name when two methods share a wrapper (like is_a? kind_of?)
#9446 Fix metaclass dispatch missing meta-metaclass methods
#9448 Use implementation class for protected check
#9460 Check argument definedness in defined?(receiver.method(arg))
#9507 IO::Buffer#read and #write treat length=0 as zero bytes instead of remaining buffer capacity
#9515 Switch to jar-deps based on mima
#9551 circular causes when re-raising an exception originally raised with the two-argument raise Class, arg form (regression in 10.1.1.0)
#9554 Raise fixes and additional spec permutations
#9556 Implement Proc#hash consistently with Proc#eql?
#9557 refactor and improve reification of java subclasses
#9559 dup of frozen class can't be extended
#9560 raise should re-populate exception trace set to nil
#9565 Socket address APIs return uncompressed IPv6 where Addrinfo#ip_address compresses, breaking Resolv::DNS with 2+ nameservers
#9568 Kernel#sprintf calls Hash#default_proc with incorrect args
#9570 fix dup for frozen class
#9579 JRuby can't pass STDOUT to child process when a different IO is given as out:
#9582 Data.define subclass fields are nil when module is included in define block
#9585 Marshaling incompatibility with cyclic objects?
#9587 IO::Buffer#copy and #set_string reject the documented source_offset fourth argument
#9588 Accept source_offset in IO::Buffer#copy and #set_string
#9593 Compiler gives a constant-folded ASCII String the code range CR_VALID, which breaks the eql? / hash contract
#9595 IO#tty? silently returns true for redirected stdio in embedded runtimes when --add-opens are missing
#9599 Kernel#require redefined inside a required file isn't seen by autoload dispatch after Kernel.prepend (CRuby 4.0 OK / JRuby 10 fails)
#9600 TracePoint does not support fiber_switch (Ruby 2.3+ compatibility)
#9602 FFI warning on when running jruby on OpenBSD/arm64, possible $$ issue as well
#9603 Implement :fiber_switch trace event
#9604 Fix Fiber.schedule inside a non-blocking Fiber
#9607 Fix Thread blocking count drifting across Fiber switches
#9609 No validation of unsetenv_others for Process.exec causes specs to execve() abruptly
#9614 Unreliable net-http tests
#9618 Resolve jar path if it's a symlink
#9619 refactor and improve reification of java subclasses (refactor only)
#9622 Defer Kernel#sleep to the Fiber scheduler
#9626 Handle nil-or-boolean arguments in popen kwargs
#9627 Use CRuby logic for exec
#9628 Fix IO::Buffer#read and #write, treat length=0 as remaining buffer capacity
#9630 Pass -1 for max arity when there's rest args
#9631 Eliminate all uses of unused "name" for arity errors
#9634 Report the errno that native exec actually returned
#9638 Bump bundled resolv default gem to 0.7.2
#9640 [AppCDS usage causing sealing violations][#9640]
#9645 [Fix the Fiber scheduler IO path: negated errno, zero length, buffer size][#9645]
#9648 [Run pager commands through the platform shell][#9648]
#9649 [Mutex Deadlock fix: Track the fiber that owns a Mutex][#9649]
#9650 [Don't raise EBADF closing an IO whose channel NIO already closed][#9650]
#9653 [[Java 26 Leyden] AOT Cache breaks dynamic Ruby proxies for classes loaded from external JARs][#9653]
#9654 [Time.new(String) raises java.lang.ArrayIndexOutOfBoundsException when the string ends where a ':' is expected][#9654]
#9655 [NoSuchMethodError when a Ruby subclass of a Java class includes a module][#9655]
#9656 [Fix IO#wait arguments and return values, and defer it to Fiber.scheduler][#9656]
#9659 [[ji] resolve Java super <init> through included modules][#9659]
#9660 [Fix where Fiber#transfer hands control back][#9660]
#9662 [Fix custom respond_to? handling: include_all, defined? lookup, deprecated signature][#9662]
#9665 [Data subclasses in net-imap are losing fields][#9665]
#9669 [jruby/vm integer messages fail on JRuby 10 due to Fixnum reference][#9669]
#9670 [Update tagged Data specs][#9670]
#9677 [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)][#9677]
#9679 [Don't wrap an alias in another alias][#9679]
#9683 [Fix bin/* patterns in .gitignore][#9683]
#9685 [Fix setup sequence for cgi/escape][#9685]
#9690 [JFFI bad library load is a huge startup hit on MacOS][#9690]
#9691 [Support zero-size IO::Buffers][#9691]
#9695 [require "json" warns about redefined to_hash with -w in JRuby 10.1.1.0][#9695]
#9696 [Set the aliased flag on the real method, not the wrapper][#9696]
#9697 [ObjectSpace::WeakMap is double-weak in CRuby][#9697]
#9701 [Allow specifying AppCDS cache location and use safer default][#9701]
#9703 [Redis::ConnectionError with JRuby 10][#9703]
#9705 [Update stdlib][#9705]
#9709 [Additional stdlib updates][#9709]
#9719 [IO#accept raises NullPointerException instead of IOError when the socket is closed concurrently][#9719]
#9720 [Update jar-dependencies to 0.6.1][#9720]

@aminmansuri

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

The JRuby community is pleased to announce the release of JRuby 10.1.1.0.

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

JRuby 10.1.1.x targets Ruby 4.0 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @chadlwilson, @kares, @katafrakt, @sampokuokkanen, @segiddins, @shugo

Notable Changes

Performance

Use FastDoubleParser to improve performance of all string-to-double parsing. #9150
Only pack fixnum values for 16-bit signed by default, with optional 8-bit and 32-bit configs. #9379

Standard Library

jruby-openssl updated to 0.16.2 with several CVE fixes from BouncyCastle. #9386, #9504, #9539
erb updated to 6.0.1.1 to address CVE-2026-41316. #9388

Native Integration

Updated JRuby's native library backend with support for OpenBSD. #9439

Java Integration

Optimized automatic interface implementation when calling Java with a block. #5023

Packaging

Begin deprecating jruby-complete and jruby-core Maven artifacts. Prefer the jruby and jruby-base artifacts. #9512

57 Issues and PRs resolved for 10.1.1.0

The JRuby community is pleased to announce the release of JRuby 10.0.6.0.

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

JRuby 10.0.6.x targets Ruby 3.4 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @chadlwilson, @kares, @sampokuokkanen

Notable Changes:

Standard Library

erb has been updated to 4.0.4.1 to address CVE-2026-41316. (#9389)
jruby-openssl has been updated to 0.16.0, fixing many long-standing issues with SSLSocket. (#6455, #8935, #9390)

Java Integration

Performance and consistency improvements for passing a block or proc as the implementation of a Java interface. (#1401, #9401, #9424)

23 Issues and PRs resolved for 10.0.6.0

The JRuby community is pleased to announce the release of JRuby 9.4.15.0.

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

JRuby 9.4.15.x targets Ruby 3.1 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward!

With this release, JRuby 9.4 moves into end-of-life ("EOL"). This means that future releases of 9.4.x will only be provided as needed by commercial JRuby users.

Get in touch with us if you require long-term support options for the JRuby 9.4.x series.

38 Issues and PRs resolved for 9.4.15.0

The JRuby community is pleased to announce the release of JRuby 10.1.0.0.

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

JRuby 10.1.0.x targets Ruby 4.0 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward!

JRuby 10.1: Experimenting and Evolving

JRuby 10.1.0.0 is our first major release since catching up with Ruby compatibility. We have used this opportunity to explore many experimental optimizations and improvements we have been chasing for many years. Ruby 4.0 compatibility is largely complete, but there will be additional features added in update releases. We also plan to continue with large scale experiments in subsequent updates, and recommend production users continue to use JRuby 10.0 while we work toward stabilization of the 10.1 series.

Here's an overview of the major enhancments already in JRuby 10.1.0.0 and others planned for update releases in the coming months.

Reduced Object Size

In JRuby 10.1 all objects have been reduced in size by 8 bytes, bringing the base object size down from 32 bytes to 24 bytes. This translates into smaller objects across the system, reduced GC load, higher allocation throughput, and better cache locality.

On JVM versions that support Compact Object Headers (JEP 450: "Project Lilliput") the base object size can be further reduced to 16 bytes, 40% smaller than objects in the standard Ruby implememtation.

Evolving Strings, Arrays, and Hashes

During the upcoming JRuby 10.1 update releases, we plan to introduce new versions of String, Array, and Hash that are optimized for memory compactness, concurrency, or integration with other JVM languages. To support these features, we have made the internal implementations RubyArray and RubyHash into abstract classes and deprecated the direct constructors for RubyString. Please test your JRuby extension code and make sure it does not call abstract or deprecated constructors.

Smaller Numeric Representations

JRuby's internal class for representing 64-bit signed Integer values, RubyFixnum, has been split into two versions: LongFixnum and ShortFixnum. Combined with the reduced size of objects overall, this reduces the size of these long and short-ranged Integer objects from 40 bytes to 32 bytes or 24 bytes (24 bytes or 16 bytes if using Compact Object Headers). The size of Float objects have similarly been reduced from 40 bytes to 32 bytes. These size reductions help improve the performance of numeric algorithms and reduce impact to the heap and GC of boxing numeric values.

Cross-platform Prism Parser

JRuby 10.1 ships with support for the Prism Ruby parser, packaged as a set of pre-optimized native builds (for Windows, Linux, and MacOS on x86_64 or arm64) or as a WASM build on other platforms. We're still working out a few remaining features, but we encourage experimenters to enable it by passing -Xparser.prism to JRuby. We plan to make this the default parser once the remaining issues are solved.

Direct Argument Passing

We have also laid the groundwork to start passing all forms of method arguments on the call stack, avoiding boxed collections for most optional and keyword arguments. In upcoming JRuby 10.1 releases, we will begin to connect these call paths up for both pure-Ruby and native (Java) method targets, eliminating box allocation and drastically improving the peformance of such forms. Watch this space for rapid improvements.

New Policy for EOL and LTS Releases

With the release of JRuby 10.1, we are moving JRuby 9.4 into a "soft" EOL status. This means we will no longer be doing regular OSS release updates of JRuby 9.4, but users may get in contact with us to sponsor continued support. JRuby 10.0 will be our stable LTS release until April 2028 and we recommend all users upgrade or get in contact with us for assistance. JRuby 10.1 will be our "tip" release line, with many exciting optimizations and enhancements due to land over the next several months.

Going forward, we will provide a new LTS baseline release every two years, starting in spring of 2027, and alternating years will be considered as edge or development versions without LTS guarantees. This will allow us a free hand to keep bringing you more experimental features while still providing a stable baseline for more conservative users.

Try JRuby Today!

Users can install JRuby 10.1 through the usual means, and we encourage you to give it a try and let us know how it handles your applications and libraries. We have much more planned for the 10.1 updates and hope to move fast and push the edges of what's possible with Ruby on the JVM.

59 Issues and PRs resolved for 10.1.0.0

#8716 dup a lot
#8747 Launcher script chokes on GraalVM release file
#9055 Array experiments
#9066 Move Set to a core class [Ruby 4.0]
#9069 Implement Ruby 4.0 support
#9074 Avoid array allocation for *nil, by not calling nil.to_a
#9075 Selective inspect of instance variables
#9077 No numbered parameters in Binding#local_variables
#9078 Add Math.{expm1,log1p}
#9079 Align IO.select timeout logic with CRuby
#9083 Implement missing raise features
#9085 Specialize Fixnum
#9090 Reduce the size of the varTableStamp
#9091 Shrink varTableStamp
#9095 Eliminate global flags
#9096 Cache object ID and hash in low-count immediate values
#9102 Add a fast path for hashing numerics and immediates
#9113 Performance regression in RubyHash for large hashes (~8-10x slower than JRuby 1.7)
#9119 Implement fast-path builtin method flags
#9123 Fast builtin validation experiment
#9124 Reduce load factor for Hash from 5 to 2
#9136 Marshal.load 2.9x regression vs JRuby 1.7
#9143 Cache both hash forms for FString
#9148 Allow logical ops to begin on beginning of next line
#9154 Mask internal Ruby backtrace elements like native masking
#9156 Small marshal fixes
#9174 Add complete thread-local builtin tracking system (Issues #9116, #9119)
#9180 [Implement implicit param logic for Binding][#9180]
#9181 [Fix Data subclasses with ivars][#9181]
#9202 [A Data object should be frozen even if it has no members][#9202]
#9209 [Add ruby_bug for spec of Data with no members being frozen][#9209]
#9210 [Remove Process::Status#& and Process::Status#>>][#9210]
#9233 [Load boot scripts from classloader URI][#9233]
#9235 [Use capitalized Class and Module for frozen errors][#9235]
#9236 [Properly handle keywords in {Kernel|Thread|Fiber}#raise][#9236]
#9238 [Cloned class's singleton class has too many classes in hierarchy][#9238]
#9239 [Fix for cloned class singleton class has too many ancestors][#9239]
#9250 [Update Unicode to Version 17.0.0 and Emoji Version 17.0][#9250]
#9262 [Abstract RubyHash][#9262]
#9263 [Implicit param fixes for proc and binding][#9263]
#9266 [Endless method with modifier method does not parse][#9266]
#9273 [Cleanup recursion guards][#9273]
#9277 [Use live counts for event hook stats][#9277]
#9279 [Move fiddle back to default temporarily for resolv][#9279]
#9286 [Proposing RISC-V architecture support][#9286]
#9287 [Add riscv64 platform support][#9287]
#9298 [Ensure we have a classloader to boot from][#9298]
#9299 [Delete methods deprecated prior to JRuby 9.4.0.0][#9299]
#9300 [Replace now-deprecated wait_timeout][#9300]
#9313 [Time being returned as ASCII-8BIT encoding in JRuby 10][#9313]
#9318 [Process.detach raises ArrayIndexOutOfBoundsException if called from a thread that is not the main thread][#9318]
#9325 [[fix] NullPointerException from closed IO][#9325]
#9362 [Allow endless methods to be an argument to methods like visibity][#9362]
#9365 [Marshal load perf][#9365]
#9371 [Deprecate all public RubyString constructors][#9371]
#9374 [Integrate WASM-based Prism parser into standard build][#9374]
#9383 [Disable IntFixnum][#9383]
#9384 [Set.new(a_set) throws LocalJumpError][#9384]
#9385 [Fixes #9384. Set.new(a_set) throws LocalJumpError][#9385]

The JRuby community is pleased to announce the release of JRuby 10.0.5.0.

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

JRuby 10.0.5.x targets Ruby 3.4 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @evaniainbrooks, @kares, @chadlwilson, #jimtng

Compatibility

Fixed: Two bugs in the JIT compiler that broke certain super calls and defined_method yields. (#8944, #8946, #9310, #9349)
Fixed: Fiber#raise left the fiber in an resumable state by not correctly transfering control. (#9297, #9356)
Fixed: Connecting a socket using nonblocking operations failed to complete the establishment of the connection. This affected Redis users, among other cases. (#9304, #9305)
Fixed: Process#detach raised a NullPointerException if called from a non-main thread. (#9314, #9311)

JVM Integration

Java 26 is officially supported. (#9332)

Platform Integration

New platform support: The native library backend for JRuby, JNR, has been updated to include support for the RISCv64 architecture.
Fixed on Windows: File#flock used unsupported native operations on Windows, causing it to raise errors. This affected the "logger" library, among other cases. (#9347, #9348)
Fixed on Windows: IO#popen failed to pass keyword arguments if also given a leading environment hash. (#9351, #9352)

Stability

Fixed: Several memory leaks that affected users running multiple JRuby instances in a single process. (#9070, #9092, #9187, #9359)

43 Issues and PRs resolved for 10.0.5.0

The JRuby community is pleased to announce the release of JRuby 10.0.4.0.

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

JRuby 10.0.4.x targets Ruby 3.4 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @evaniainbrooks, @katafrakt, @mrnoname1000

Standard Library

The syslog library moves to bundled gems. (#9198)
The unicode_normalize library is now thread-safely loaded as an internal library (#9231, #9232)

43 Issues and PRs resolved for 10.0.4.0

@mrnoname1000

layout: post
title: JRuby 10.0.3.0 Released

The JRuby community is pleased to announce the release of JRuby 10.0.3.0.

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

JRuby 10.0.3.x targets Ruby 3.4 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @mrnoname1000, @ngr-ilmarh, @Earlopain, @philr, @jotamartos, @kares, @aleksandrs-ledovskis, @trinistr, @katafrakt, @chadlwilson, @khasinski, @evaniainbrooks

Compatibility

JRuby now reports RbConfig::CONFIG['arch'] without a version number, as universal-java. This allows using different JDK versions without triggering RubyGems missing extension warnings for installed gems. The host Java version is still available as RbConfig::CONFIG['arch_version']. [#9107]

Standard Library

The non-gem standard library is upgraded to Ruby 3.4.5 #8967
rexml is updated to 3.4.4 to address CVE-2025-58767. #9011
syslog is moved to a default gem at version 0.4.0. The syslog gem now includes JRuby support. [#9109], ruby/syslog#1
strscan is updated to 3.1.7. [#9159]

Documentation

Ruby ri documentation for core and standard library are now included in the release distribution. #9049, #9052

All Issues/PRs

#8707 WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
#8727 Cannot install latest rubocop
#8730 Launcher: Defensive fixes
#8758 Require is not working for .class file if the class is inside a module since 9.3.0
#8810 Possible fix for 8809
#8923 NameError for autoloaded constant with private_constant
#8934 JRuby under Java 22+ always thinks it's running under a TTY
#8940 Verify to_s is string or fall back on anyToString
#8947 New check for System.console tty on JDK 22+
#8955 Range#count always returns size for Integer bounds
#8956 Handle argument or block passed to Range#count
#8958 Concurrent requires can lead to StringIndexOutOfBoundsException
#8960 Fix index -1 error while searching for feature path
#8962 Upgrade polyglot and remove openssl lib hack
#8967 Update stdlib to 3.4.5 and clean up old files
#8975 Use RuboCop to clean up poms (10.x)
#8976 Regression in keyword argument matching in JRuby v10.0.1.0
#8978 Additional fixes for scheme-based globbing
#8984 glob refactoring
#8985 Fix language spec where error string changed
#8987 InvokeDynamicSupport.findVirtual fails with IllegalAccessException: symbolic reference class is not accessible
#8989 Explicitly request access before Lookup.find*
#8994 autoload + private_constant do not play well together
#8995 private_constant should just update existing autoload
#8996 Avoid binding unreadable modules' classes
#8998 Time#localtime incorrectly treats zero offset as UTC (regression in v10.0.2.0)
#9006 Consider .class a source extension during search
#9007 Handle warn(foo, uplevel: nil)
#9009 Encoding a string with undefined chars fails with NoMethodError
#9010 Fix "+00:00" and 0 being treated as UTC by Time#localtime and Time.at
#9011 Update rexml gem to solve CVE-2025-58767
#9016 [fix] regression calling static hash() method on Java proxy
#9017 can not use Java class with static hash() method
#9018 Parser does not convert newlines reading \r\n on Windows
#9019 We need to remove \r from heredoc strings
#9021 Retire safe double processing utilities
#9024 Move all main classes to org.jruby.main package
#9027 Add "since" to bare Deprecated annotations
#9035 IO#read does not clear code-range for buffer argument
#9036 fix: clear code-range when re-using a string buffer
#9038 Add opens and native access to all jar manifests
#9039 Update all jnr dependencies
#9041 Migrate .java-version contents to .jruby.release
#9049 ri docs are not available for core
#9050 Marshal fails to load an encoding with an encoding ivar
#9051 Ignore encoding when unmarshaling an Encoding
#9052 Download and include in dist CRuby's rdoc data
#9058 Implement efficient unshifting
#9059 [Reserve extra space before elements when unshifting][#9059]
#9063 [Hash's compare_by_identity state does not marshal][#9063]
#9065 [Preserve compare_by_identity for marshaled Hash][#9065]
#9068 [Windows CI spec runs][#9068]
#9073 [fix: Permit overriding of JSA file location using ENV variable][#9073]
#9084 [object_id improvements][#9084]
#9094 [Implement GC.config [Ruby 3.4]][#9094]
#9097 [Update jruby-openssl to v0.15.5 to resolve BouncyCastle 1.79 vulnerability (sonatype-2025-001911).][#9097]
#9098 [Fix CoverageData.mergeLines when coverage increases][#9098]
#9101 [Cached fixnums for immediate values][#9101]
#9103 [Update jruby-openssl to 0.15.5][#9103]
#9106 [Use smaller default size for many collections][#9106]
#9107 [Separate Java version out of rbconfig 'arch'][#9107]
#9108 [Tidy up default gems][#9108]
#9109 [Switch to syslog gem][#9109]
#9110 [Calling inspect on proc resets line in source_location][#9110]
#9112 [Prevent modifying state in RubyProc][#9112]
#9117 [Add file path to error message when unlinking non-existing file][#9117]
#9122 [Unexpected jruby.sh error messages on Windows][#9122]
#9127 [fix(launcher): correct parsing of java release files under Bash/msys2 etc on Windows][#9127]
#9138 [Copy Data type's var table manager with new realClass][#9138]
#9141 [refactorings and cleanup motivated by error-prone][#9141]
#9142 [Change GC's methods from module_function to metaclass methods][#9142]
#9145 [Never trust external content for FString][#9145]
#9152 [Marshal.dump corruption for large Array structures][#9152]
#9157 [bump included gems][#9157]
#9158 [Use same key match for containsKey][#9158]
#9159 [Update strscan to 3.1.7][#9159]
#9182 [Fix NoMethodError when encoding with invalid: :replace option][#9182]
#9188 [Different arguments for each.map vs each and map alone (10.0)][#9188]
#9189 [Fixes #8952. Nest it should be different its][#9189]
#9190 [Backport implicit local variable fixes from 10.1][#9190]
#9191 [Fixes #8952. Nested 'it' behavior broken][#9191]
#9192 [Stab at Fixing #8976][#9192]
#9194 [BigDecimal#+, #-, #add, #sub always try to cast result of coercion to RubyBigDecimal][#9194]
#9196 [require "bigdecimal" does not install BigDecimal() if it was called previously][#9196]
#9199 [Output formatting differences between jRuby 10.0.0.1 and Ruby 3.4 when converting Float to JSON][#9199]
#9200 [Extract float formatting into a static method to use with to_json][#9200]
#9203 [Invalidate method caches from generated populators][#9203]
#9204 [Fix BigDecimal#+, #-, #add, #sub failing when coercing doesn't return a BigDecimal][#9204]
#9205 [Fix encoding fallback error handling and error message formatting][#9205]

The JRuby community is pleased to announce the release of JRuby 9.4.14.0.

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

JRuby 9.4.14.x targets Ruby 3.1 compatibility.

Thank you to our contributors this release, you help keep JRuby moving forward! @matthias-fratz-bsz, @ikaronen-relex, @ylecuyer

Compatibility

Ruby version is now 3.1.7. (#8966)

Libraries

strscan is updated to 3.1.5. (#8897)
cgi is updated to 0.3.7 to resolve CVE-2025-27220 and CVE-2025-27219 (#8954, #8966)
uri is updated to 0.12.4. (#8966)
net-smtp is updated to 0.3.1.1. (#8966)
rss is updated to 0.3.1. (#8966)
Non-gem stdlib has been updated to Ruby 3.1.7 sources. (#8966)

Build

jruby-maven-plugins is updated to 3.0.6 to resolve issues with garbled gem poms. (#8898)
The stdlib build scripts have been modified to work with latest polyglot-ruby. (#8634, #8963)

Usability

bin/ruby and bin/ruby.bat are now shipped in the distribution, to make installation simpler. (#8875)

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Releases: jruby/jruby

Release list

JRuby 10.1.2.0

Notable Changes

Compatibility

Performance

Standard Library

Default gems

Bundled gems

76 Issues and PRs resolved for 10.1.2.0

Contributors

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JRuby 10.0.7.0

Notable Changes

Performance

Java Integration

Standard Library

Default gems

53 Issues and PRs resolved for 10.0.7.0

Contributors

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JRuby 10.1.1.0

Notable Changes

Performance

Standard Library

Native Integration

Java Integration

Packaging

57 Issues and PRs resolved for 10.1.1.0

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JRuby 10.0.6.0

Notable Changes:

Standard Library

Java Integration

23 Issues and PRs resolved for 10.0.6.0

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JRuby 9.4.15.0

38 Issues and PRs resolved for 9.4.15.0

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JRuby 10.1.0.0

JRuby 10.1: Experimenting and Evolving

Reduced Object Size

Evolving Strings, Arrays, and Hashes

Smaller Numeric Representations

Cross-platform Prism Parser

Direct Argument Passing

New Policy for EOL and LTS Releases

Try JRuby Today!

59 Issues and PRs resolved for 10.1.0.0

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JRuby 10.0.5.0

Compatibility

JVM Integration

Platform Integration

Stability

43 Issues and PRs resolved for 10.0.5.0

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JRuby 10.0.4.0

Standard Library

43 Issues and PRs resolved for 10.0.4.0

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JRuby 10.0.3.0

layout: post title: JRuby 10.0.3.0 Released

Compatibility

Standard Library

Documentation

All Issues/PRs

Contributors

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JRuby 9.4.14.0 Released

Compatibility

Libraries

Build

Usability

29 Issues and PRs resolved for 9.4.14.0

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layout: post
title: JRuby 10.0.3.0 Released