JRuby

JRuby allows Java developers to embed the Ruby interpreter in any Java application with dual access for both Java and Ruby scripts.

JRuby is platform independent and has built-in support for Rails, RSpec, Rake, and the RubyGems frameworks.

JRuby has slowly evolved from 2001 to become a stable development environment, being initially developed at Sun, then at Engine Yard, and now at Red Hat.

What is new in this release:

• Ruby 2.2 compatibility
• A new optimizing runtime based on a traditional compiler design
• New POSIX-friendly IO and Process
• Fully ported encoding/transcoding logic from MRI
• Resolved various issues with stat() on Windows
• Fixed couple of encoding/transcoding issues
• Source with __FILE__ in it will now JIT
• Native call subsystem will load on mixed 32/64 bit Linux distributions

What is new in version 1.7.21 / 9.0.0.0.rc2:

• Time.getlocal accepts fixnum as an argument (Rails 4.2 blocker)
• A few encoding fixes
• Socket.read(0) does not block (1.9)

What is new in version 1.7.20 / 9.0.0.0.pre2:

• Time.getlocal accepts fixnum as an argument (Rails 4.2 blocker)
• A few encoding fixes
• Socket.read(0) does not block (1.9)

What is new in version 1.7.19 / 9.0.0.0.pre1:

• Time.getlocal accepts fixnum as an argument (Rails 4.2 blocker)
• A few encoding fixes
• Socket.read(0) does not block (1.9)

What is new in version 1.7.16:

• Fixed regression which improperly wrote wrong version for OSGi bundles
• Fixed several regressions involving symbolic links and Ruby loading
• Doubled performance of FileTest.directory

What is new in version 1.7.15:

• Potential memory leak resolved when reloading JRuby apps in Java App servers
• jruby-jars gem did not have their embedded jars within it
• rvm install of jruby would not properly follow gemset symlinks
• Windows exec works again
• lstat did not honor native.enabled property and always invoked native

What is new in version 1.7.13:

• Ability to upgrade jruby-openssl as a gem
• New custom profiler API
• Several BigDecimal fixes

What is new in version 1.7.12:

• Mostly small Ruby 1.9.3 compatibility fixes.
• Fixed a small leak if throwing lots of X509Errors.
• Improved loading speed of Ruby files from jar files.

What is new in version 1.7.11:

• Miscellaneous encoding fixes
• Several fiber edge cases fixed
• Fiber thread pool reinstated
• More Ruby-friendly Java backtraces

What is new in version 1.7.8:

• Fixed Windows ‘rails new' regression (bundle install exits)
• Fixed OpenSSL gem bootstrapping problem
• Fixed Google App Engine bootstrapping problem
• A few missing 1.9+ Pathname features added

What is new in version 1.7.4:

• Many IO and encoding issues fixed
• Transcoding support for :xml entity encoding
• Proc and block dispatch perf improvements
• Fiber and Enumerator#next improvements and fixes
• Fixed a regression in windows java native launcher
• Experimental Ruby 2.0 support (most features and stdlib included)
• 90%+ complete Ripper support
• OpenSSL fixes and updated to newer Bouncy Castle library
• Updates and fixes to FFI subsystem (compat with C ext, AIX support, etc)
• Long running regexp can be interrupted by Thread#kill and raise

What is new in version 1.7.3:

• Reworked openssl ext to allow updating from gem.
• Improved performance of constants and global variables.
• Improved performance of Java arrays accessed from Ruby.
• Many miscellaneous 1.9 compatibility fixes.

What is new in version 1.7.2:

• Reworked openssl ext to allow updating from gem.
• Improved performance of constants and global variables.
• Improved performance of Java arrays accessed from Ruby.
• Many miscellaneous 1.9 compatibility fixes.

What is new in version 1.7.1:

• New hashing algorithm
• Update standard lib to match MRI patchlevel 1.9.3p327
• Several fixes to new io/console.rb implementation
• system/spawn/popen fixes and additional options hash fixes
• Several SSL fixes (jruby-openssl release coming soon for 1.6.8 users)
• IO.select not erroneously reporting data to be read
• Psych YAML engine updated to latest

What is new in version 1.7.0:

• Ruby standard library updated to 1.9.3p286
• Many 1.9.x compatibility fixes
• Support for invokedynamic
• Performance and concurrency improvements throughout
• Java 5 support dropped (Java 6+ required)
• All known 1.9 encoding issues resolved
• Kernel#exec now does a true native exec on all platforms
• Improvements and fixes to Java integration and embedding
• Native features now better supported on Solaris, ARM Linux, and others
• Update to Rubygems 1.8.24
• Update to Rake 0.9.2.2

What is new in version 1.7.0.RC2:

• The first JRuby to support the new "invokedynamic" feature of the JVM.

What is new in version 1.7.0 preview2:

• Many 1.9.x compatibility fixes
• invokedynamic has been disabled for now on Java 7 (still on by default on Java 8)
• Performance and concurrency improvements
• Java 5 support dropped (Java 6+ required)
• Several IO transcoding issues
• YAML now encodes scalars properly instead of using Java locale
• Kernel#exec now does a true native exec on all platforms
• Improvements and fixes to Java integration and embedding
• Fix several native support issues on Solaris

What is new in version 1.7.0 preview1:

• 1.9.3 is now our default runtime mode (-1.8 is needed for 1.8.7 support)
• Many 1.9.x compatibility fixes
• Support for Java 7's invokedynamic*
• Performance and concurrency improvements
• Java 5 support dropped (Java 6+ required)
• Update to Rubygems 1.8.24
• Update to Rake 0.9.2.2

What is new in version 1.6.7.2:

• This is a special release of JRuby which only updates our shipped copy of RubyGems to version 1.8.24.

What is new in version 1.6.7:

• Fix circular require issue in Rubygems introduced by our Maven gem support
• Fix regression in popen* where streams get prematurely closed
• Many 1.9-mode encoding bugs fixed in String, Regexp, StringIO, and YAML
• Win32OLE now works in 1.9-mode
• ffi on Win x64 now knows about basic types :size_t
• Use jzlib to fix a set of issues with out zlib library
• Reduced internal locking based on user reports
• C extensions work on OS X again
• Gems with gemspecs which contain UTF-8 multi-byte chars install in 1.9 mode

What is new in version 1.6.6:

• Updated stdlib to match Ruby 1.8.7p357 and 1.9.2p312
• Updated RubyGems to 1.8.15
• Multiple 1.9-mode yield/splat bugs fixed (pp, rspec 2.8 working again)
• Multiple 1.9-mode encoding bugs fixed
• Critical fixes in Random and Fiber
• Map Scala operator methods to symbolic names ($plus, etc)

What is new in version 1.6.5:

• Many -1.9 encoding issues resolved
• .jrubyrc support for storing convenient execution options
• New cext.enabled property to turn off only C extentions but not native support
• C extension support now uses less memory
• Updated to Rubygems 1.8.9
• -rjruby/thread_dump adds a USR2 Ruby thread dumper
• Improved peformance interacting directly with Java Maps
• Improved fiber performance and support for JVM coroutines
• Improved zlib support
• 36 Issues resolved

What is new in version 1.6.4:

• 1.9 language and core class fixes
• New Native MacOS installer
• Overloaded Java method dispatch perf fix
• Java dispatch block cercion perf fix
• Disabling native now disables C extension support
• JRuby can be built with 1.9 mode by default
• 48 Issues resolved

What is new in version 1.6.3:

• 1.9 language and core class fixes
• Ruby object construction performance boost
• Require performance improvements
• Windows native exec fixes
• 39 Issues resolved

What is new in version 1.6.2:

• YAML problem generating an ArrayIndexOutOfBounds Exception.
• Java names of the form getX were not getting aliases of get_x, x (regression).
• A couple of embedding errors.
• A few 1.9 issues resolved.

What is new in version 1.6.1:

• Numerous 1.9-mode features and bugs fixed.
• Various fixes to installing and running C extensions.
• Kernel.exec on windows does a native exec (CreateProcess).
• Performance fixes for non-blocking IO methods.
• Performance tweaks for Array, String, and a few other core classes.
• Updated JSR292 (invokedynamic) support.
• 193 commits and 47 issues resolved since 1.6.0.

What is new in version 1.6.0:

• Ruby 1.9.2 language and API compatibility (Not implemented Encoding::Converter, ripper).
• Improved Ruby call performance.
• Built-in profiler (-profile, -profile.graph).
• RSpec no longer bundled.
• C Extension support (experimental).
• RubyGems Maven support (preview).
• Improved compatibility and user experience on Windows.
• jruby-complete.jar now includes 1.9 standard library.
• Embedding API refinements.
• Over 2000 commits and 270 issues resolved.

What is new in version 1.6.0.RC3:

• New readable backtrace format.
• Easier to embed in OSGi environment.
• Fixed regression which slowed down jar-based requires.
• Add native JFFI bits for x86_64 SunOS (Solaris).
• More platforms with pre-built C extension support.
• New jruby-core and jruby-stdlib maven artifacts.
• More 1.9 compatibility fixes.

What is new in version 1.6.0.RC2:

• Major Features:
• Ruby 1.9.2 language and API compatibility (Not implemented Encoding::Converter, ripper).
• Improved Ruby call performance.
• Built-in profiler (-profile, -profile.graph).
• RSpec no longer bundled.
• C Extension support (experimental).
• RubyGems Maven support (preview).
• Improved compatibility and user experience on Windows.
• jruby-complete.jar now includes 1.9 standard library.
• Embedding API refinements.
• Over 2000 commits and 265 issues resolved.

What is new in version 1.6.0.RC1:

• Ruby 1.9.2 language and API compatibility (Not implemented Encoding::Converter, non-ASCII identifiers, ripper, fiddle)
• Improved Ruby call performance
• Built-in profiler (-profile, -profile.graph)
• RubyGems 1.4.2
• RSpec no longer bundled
• C Extension support (experimental)
• RubyGems Maven support (preview)
• Improved compatibility and user experience on Windows
• jruby-complete.jar now includes 1.9 standard library
• Embedding API refinements
• Over 2000 commits and 265 issues resolved.

What is new in version 1.5.6:

• Rbconfig's Config::CONFIG provides wrong name for Windows 2008 Server.
• Fix classpath and load path issues related to file paths containing spaces.
• java.util.ConcurrentModificationException.
• become_java! doesn't add Ruby class methods as statics on the resulting Java class.
• Marshal.load fails when Kernel.read is defined.

What is new in version 1.5.5:

• Updated jaffl for YourKit compatibility.
• Ant.load_from_ant is broken on Windows.
• Cucumber Japanese example raises exception on JRuby.
• Marshalled ruby hash gets loaded incorrectly.
• kernel.system not working in 1.5.3 on Windows.
• Cannot run ‘jruby -S rake test' for Rails project on Windows in 1.5.3.
• Webrick socket.readline causes 100% cpu usage.
• Marshal dump format error and inconsistencies with MRI.
• java.awt.Component.instance_of?() expects 2 args.
• Backtick operator does not work on Windows in 1.5.3.
• Requiring ‘ffi' defines class method :error on Module.
• Can't include interfaces in a synchronized class.

What is new in version 1.5.3:

• ConditionVariable use causes thread deadlocks.
• SelectorProvider.openSelector() will sometimes fail on Windows.
• Kernel#exec does not heed ENV['PATH'] when launching shell command.
• Subprocess started by Kernel#exec does not respect RUBYOPT and other environment variables set via ENV.
• ScriptEngine ignores global bindings.
• Remove noisy warning when setting ScriptEngine.ARGV.
• Scala classes (and perhaps others) are named oddly and break Java reflection.
• File.open with permissions has sideffect of clearing umask.

What is new in version 1.5.2:

• JRuby and open-uri File handle issue.
• Anonymous classes are piling up and filling up PErmGen, eventually causing a crash.
• Memory Leak when extending Java class with additional Ruby instance variable.
• XSS in WEBrick.
• SSLSocket holds selectors, keys, preventing quick cleanup of resources when dereferenced.

What is new in version 1.5.1:

• Uncaught AccessibleObject.setAccessible fails on App Engine
• ObjectSpace.undefine_finalizer does not work
• JRuby exit hangs on ChannelStream.finalize
• Regression: JRuby 1.5 doesn't pick up JDBC drivers from CLASSPATH
• Memory Leak when extending Java class with additional Ruby instance variable
• Regression processing END between JRuby 1.4 and 1.5
• Known bug in net/http.rb
• jruby behaves differently from MRI with (rails 2.3.8) activerecord associations
• FileUtils.touch does not update the mtime of directories on Windows
• IO#open(&block) + close sets $! which disables Test::Unit::Autorunner
• Multiple block args to ActiveRecord association proxy are splatted incorrectly
• File is not expanded when it is used from within a a compiled ruby script used as the main class of an executable jar

What is new in version 1.4.0:

• JRuby is now compatible with 1.8.7 patchlevel 174
• Windows Native Launcher - Solves many reported bugs with our old .bat scripts
• YAML parser Yecht (bug-for-bug compatible with Syck!)
• Java Integration Support: faster and new java_method, java_send, and java_alias methods
• Windows installer
• New embedding framework
• Java 6 scripting out of the box
• New org.jruby.embed package to supersede JavaEmbedUtils
• Many 1.9 mode (-1.9) fixes
• Updated stdlib to 1.9.2preview2
• Rubygems now working
• Rails 2.3.3 simple apps working (2.3.4 has 1.9 bug)
• Much better error reporting
• Shorter backtraces with less Java
• Ruby-compatiable syntax error reporting
• 307 bugs fixed since 1.3.1

What is new in version 1.3.1:

• Fixes a recently discovered security bug in BigDecimal
• Fixes a regression in timeout (0-1 second timeouts truncate to 0)
• Fixes a regression Thread.wakeup where the thread would not wake up

Requirements:

• Java 6 or higher