> Homepage: http://www.jruby.org/
> Download: http://www.jruby.org/download

> After three very helpful release candidates we have a final 1.4.0 release.
> This release ends a long release cycle in which we resolved a huge number of
> issues. The headline feature is a move to Ruby 1.8.7 support, in line with
> Rails' own plans to make 1.8.7 the required minimum version of Ruby.

>   We have also gotten more serious about out 1.9 support (--1.9).  The
> bigger applications mostly just work at this point, but we still have a
> ways to go on 1.9 support.  Please try your 1.9 code in JRuby and help us
> firm things up.

> 1.4.0 Highlights:
> - JRuby is now compatible with 1.8.7 patchlevel 174
> - Windows Native Launcher
>   - Solves many reported bugs with our old .bat scripts
> - New YAML parser Yecht (bug-for-bug compatible with Syck!)
> - Improved Java Integration Support
>     - faster
>     - 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)
> - rubygems 1.3.5
> - Much better error reporting
>     - shorter backtraces with less Java
>     - Ruby-compatiable syntax error reporting
> - 307 bugs fixed since 1.3.1

> We want to thank all the users who have been helping us to get a better
> release out.  Special thanks to Hiro Asari, David Calavera, and
> Roger Pack for their recent activity in the project.  We also want to
> welcome Yoko Harada as a committer to the project.  Her work and
> support of our embedding efforts has been great.

> Key        Summary
> JRUBY-382     Better error output from parser
> JRUBY-558     Integration method matching needs more help with nulls
> JRUBY-937     JRuby does not honor RUBY_OPTS or RUBYOPT
> JRUBY-1316     Command line doesn't recognize KEY=value construct on WIndows
> JRUBY-2232     UNIXSocket doesn't work on Solaris
> JRUBY-2324     AST Node positions and content incorrect when passing
> down Multibyte content to lexer
> JRUBY-2349     Bug in constant lookup on non Module or Class
> JRUBY-2398     We should strive to implement the 1.8.7 improvements
> JRUBY-2419     Argument application within block is not parsed
> correctly (for Range literals)
> JRUBY-2525     Dir.glob ordering inconsistent with Matzruby
> JRUBY-2587     [1.8.7] Hash.[] should call to_ary if only one argument
> is provided
> JRUBY-2604     [1.8.7] Implement Binding#eval method
> JRUBY-2626     Many rubyspec failures for SortedSet
> JRUBY-2654     File pty.rb is not part of the JRuby distro, but is
> part of the Ruby standard lib
> JRUBY-2666     Issues with Socket#getaddrinfo
> JRUBY-2694     [1.8.7] Ability to specify suffix/extension for Tempfile
> JRUBY-2839     Eight new BigDecimal RubySpec failures
> JRUBY-2866     Set .include? method behavior differs between JRuby
> 1.1.3 and Ruby 1.8.7
> JRUBY-2895     Wildcard arguments not properly expanded on Windows
> JRUBY-3024     Better handling if suppressAccessChecks is not permitted
> JRUBY-3030     jruby/test/rubicon/test_object_space.rb fails on Windows XP SP 2
> JRUBY-3081     CLASSPATH append problem in bin/jruby script under cygwin
> JRUBY-3123     Java primate arrays no longer respond to 'first'
> (Array) from ruby
> JRUBY-3150     Execution variable $: does not include on the taint
> check level > 1
> JRUBY-3154     Net::HTTP.read_timeout is ignored, timeout is intinite
> instead (leading to massive accumulation of sockets and reading
> threads)
> JRUBY-3159     -e option does not work with iterator blocks
> JRUBY-3165     Add stream/reader based methods to
> JavaEmbedUtils.RuntimeAdapter as convenience methods
> JRUBY-3215     BSF does not retain local scope between eval calls
> JRUBY-3240     YAML: active_support dump of BigDecimal differs from MRI
> JRUBY-3245     Java exceptions not caught when converting java objects
> to ruby objects
> JRUBY-3263     imcompatibility with Ruby-1.8.6 in YAML parsing
> JRUBY-3266     undefined method 'add_ruby_type' for YAML:Module
> JRUBY-3297     Array.new with (size, object=nil) returns the value
> passed to break
> JRUBY-3306     --1.9 mode doesn't know define_singleton_method
> JRUBY-3319     Date spec failures
> JRUBY-3321     matrix rubyspec failures
> JRUBY-3323     rational rubyspec failures
> JRUBY-3327     Possible YAML parsing error
> JRUBY-3346     Need pointers of Ruby blocks (JRuby FFI)
> JRUBY-3350     JRuby .bat scripts do not correctly find Java without
> JAVA_HOME env var
> JRUBY-3352     JNA-based FFI fails to load for specs on Windows
> JRUBY-3368     java.util.List[range] is broken
> JRUBY-3380     New 1.9 Enumerator methods
> JRUBY-3389     RubySpec: Hash#update raises a TypeError if called on a
> non-empty, frozen instance
> JRUBY-3412     YAML.dump loses the timezone when dumping Time instances
> JRUBY-3419     JRuby Fails (MRI 1.8.6 works) in Sinatra "helpers" when
> no arguments
> JRUBY-3433     Encoding.default_internal and Encoding.default_external missing
> JRUBY-3435     Enumerable missing fiber-related next, rewind, with_index methods
> JRUBY-3442     1.9 allows trailing commas in method invocations
> JRUBY-3453     Make import not complain if Java already has already
> imported the specific Java class
> JRUBY-3473     RubySpec: OpenStruct frozen failures
> JRUBY-3478     Dir.new does not work for directories inside jar file
> JRUBY-3499     File.expand_path (from inside a jar) uses %20 instead
> of space characters
> JRUBY-3505     Can't install hpricot (0.7) gem
> JRUBY-3518     yaml_initialize not called for subclasses of standard types
> JRUBY-3524     Erroneously redirecting stdout when running jgem
> JRUBY-3545     ArrayIndexOutOfBoundsException when opening
> Bio::FlatFiles (bioruby gem)
> JRUBY-3546     ~/.hoerc results in parsing error
> JRUBY-3550     strftime breaks unicode characters in format string
> JRUBY-3558     RubySpec: Defining instance methods on an eigenclass
> define public methods
> JRUBY-3559     the integratated joda time version should be in a
> distinct package hierarchy
> JRUBY-3567     RubySpec: The __FILE__ constant equals a relative path
> when required using a relative path
> JRUBY-3575     File permission errors installing gems in 1.9 mode
> JRUBY-3576     utf-8 string becomes macroman on os x
> JRUBY-3577     File and FileTest methods should use to_path to coerce
> non-string parameters
> JRUBY-3591     Hexadecimal constants do not have the same equal?
> behaviour between JRuby and CRuby
> JRUBY-3592     Regression test failure (test_grpowned)
> JRUBY-3605     [1.9] IO.initialize missing option hash parsing
> JRUBY-3606     [1.9] IO.set_encoding is stubbed out
> JRUBY-3607     [1.9] IO.external_encoding stubbed out
> JRUBY-3611     RubySpec: "StringIO#sysread when passed no arguments" failures
> JRUBY-3612     RubySpec: Array#to_s returns '[...]' for the embedded
> array in a recursive array
> JRUBY-3627     Parsing related methods and class/interdace should have
> ManyVarsDynamicScope to share local variables
> JRUBY-3653     RubySpec: Hash failures "computes equality for complex
> recursive hashes"
> JRUBY-3654     RubySpec: Array failures relating to recursive arrays
> JRUBY-3662     JavaEmbedUtils should have methods to set/reset Standard I/O
> JRUBY-3682     Hashcodes for Hash objects break compatability with MRI
> JRUBY-3687     Bundle JSR 223 support in JRuby
> JRUBY-3688     IO.read fails to read files in /proc filesystem on Linux
> JRUBY-3700     test/externals/ruby1.8/yaml/test_yaml failures
> JRUBY-3702     The method methods
> JRUBY-3703     TestCommandLineSwitches fails on Windows
> JRUBY-3705     Rubyspec: behavior of $: under safe > 1
> JRUBY-3706     Rubyspec: method arity behavior
> JRUBY-3707     Rubyspec: Process egid behavior
> JRUBY-3713     TwoVarDynamicScope only supports scopes with two variable
> JRUBY-3718     FFI: put_pointer and put_array_of_pointer fails to send
> :to_ptr to their argument
> JRUBY-3721     sub-optimal IO#read after IO#getc
> JRUBY-3722     block parameter problem
> JRUBY-3731     --debug causes problems. Methods are missing.
> JRUBY-3733     Accessors arity
> JRUBY-3736     JRuby won't load a .jar if a .so is found too.
> JRUBY-3738     jruby 1.3.0 windows vista issues: doesn't output
> helpful error if JAVA_HOME undefined, and JAVA_HOME path defined in
> quotes not supported
> JRUBY-3745     RubySpec: Hash#rehash causes a RuntimeError to be
> raised if called inside an iterator block
> JRUBY-3747     String#gsub! with pattern and block raises a
> RuntimeError when self is frozen
> JRUBY-3748     RubySpec: Kernel.Integer raises an ArgumentError if
> there is a space between the + and number
> JRUBY-3750     JRUBY_OPTS="--1.9" results in error "jruby: unknown option --1.9"
> JRUBY-3751     YAML.load fails for Struct objects with non-standard initialize
> JRUBY-3757     String.split is broken
> JRUBY-3759     syslog not available for JRuby --1.9
> JRUBY-3761     FileUtils.chown_R produces ArgumentError when the
> directory contains a symlink
> JRUBY-3766     update .classpath for building jruby with eclipse
> JRUBY-3773     CLONE -custom YAML serialization ignored by JRuby
> JRUBY-3774     >>define_method :name do | &blk | << ignores
> JRUBY-3776     The install-gems goal throws exceptions
> JRUBY-3777     Exception on Solaris loading ruby gems
> JRUBY-3778     clone of stderr and stdout not working
> JRUBY-3782     BSF interface - apply nonfunctional with

> Is there a recommended way to deal with gem migration to the new release?
>  I've been using jruby 1.3.0 and have a few gems installed.  I copied the
> gem cache over but can't seem to build from it.