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I want to create a Java applet using JRuby. That is, I want to create a Java applet with Ruby code inside run by JRuby to do all the GUI stuff. I am looking for a simple example of how to do this to get started.
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Check out these links...
JRubyApplet from our codebase: https://github.com/jruby/jruby/blob/master/src/org/jruby/JRubyApplet.java
Rake tasks for building a signed applet: https://github.com/jruby/jruby/blob/master/rakelib/applet.rake
Source for jruby.org/tryjruby page: https://github.com/jruby/jruby.github.com/blob/master/www/tryjruby.html
For your case, you'd probably have the applet in Java, bootstrap an org.jruby.embed.ScriptingContainer instance, and then feed it the Applet instance so it can add your UI elements in a Ruby script. Anything in the applet jar can be loaded directly, e.g. require 'my_applet.rb' will look for /my_applet.rb in the jar.
Enjoy!
In addition to the links posted earlier, the following is an example of JRuby in an applet running live: http://www.jruby.org/tryjruby