add jruby support by protobuf-java reflection API
diff --git a/ruby/README.md b/ruby/README.md
index 8331d28..d2fa76a 100644
--- a/ruby/README.md
+++ b/ruby/README.md
@@ -60,15 +60,28 @@
* Ruby development headers
* a C compiler
-First, install the required Ruby gems:
+To Build the JRuby extension, you will need:
- $ sudo gem install bundler rake rake-compiler rspec rubygems-tasks
+* Maven
+* The latest version of the protobuf java library
+* Install JRuby via rbenv or RVM
+
+First switch to the desired platform with rbenv or RVM.
+
+Then install the required Ruby gems:
+
+ $ gem install bundler
+ $ bundle
Then build the Gem:
$ rake gem
$ gem install pkg/protobuf-$VERSION.gem
+To run the specs:
+
+ $ rake test
+
This gem includes the upb parsing and serialization library as a single-file
amalgamation. It is up-to-date with upb git commit
`535bc2fe2f2b467f59347ffc9449e11e47791257`.
