Bean Scripting Framework (BSF) Introduction

To include BSF into your Java code you first need to register the JRuby engine:

BSFManager.registerScriptingEngine("ruby", "org.jruby.javasupport.bsf.JRubyEngine", new String[] { "rb" });

Now you have to create a new BSFManager:

BSFManager manager = new BSFManager();

After you have some Java objects you can declare (export) them as "beans" in BSF:

manager.declareBean("frame", aFrame, JFrame.class);

These beans can be accessed from Ruby as global variables (in this case `$frame'). You can also register objects:

manager.registerBean("frame", aFrame);

this registered object can be accessed by calling:

$bsf.lookupBean("frame")

method in Ruby. Now you can execute Ruby scripts:

manager.exec("ruby", "(java)", 1, 1, "$frame.setTitle(\"A Frame\")");

Or evaluate Ruby expressions:

Object obj = manager.eval("ruby", "(java)", 1, 1, "(1..10).collect { |e| e ** 2 }.first");
int result = ((Integer)obj).intValue();

Example