$ jruby HelloWorldMessage.rb
Sending Message: Hello World
Read Message: Hello World

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# @(#)HelloWorldMessage.rb	1.0 11/06/08
# 
#############################################################################
#
# The HelloWorldMessage.rb consists only of a main method, which sends
# a message to a queue and then receives the message from the queue.
#
require "java"

# Import the JMS API classes.
include_class "javax.jms.Session"

include_class "com.sun.messaging.ConnectionFactory"
include_class "com.sun.messaging.Queue"

class HelloWorldMessage
  def run
    # Instantiate a Sun Message Queue ConnectionFactory
    myConnFactory = ConnectionFactory.new

    # Create a connection to the Sun Message Queue Message service
    myConn = myConnFactory.createConnection()

    # Create a session within the connection 
    mySess = myConn.createSession(false, Session::AUTO_ACKNOWLEDGE)

    # Instantiate a System Message Queue Destination
    myQueue = Queue.new("world")

    # Create a message producer
    myMsgProducer = mySess.createProducer(myQueue)

    # Create and send a message to the queue
    myTextMsg = mySess.createTextMessage()
    myTextMsg.setText("Hello World")
    puts "Sending Message: " + myTextMsg.getText()
    myMsgProducer.send(myTextMsg)

    # Create a message consumer
    myMsgConsumer = mySess.createConsumer(myQueue)

    # Start the Connection
    myConn.start()

    # Receive a message from the queue
    txtMsg = myMsgConsumer.receive()

    # Retreive the contents of the message
    puts "Read Message: " + txtMsg.getText()

    # Close the session and connection resources
    mySess.close()
    myConn.close()
  end
end

helloApp = HelloWorldMessage.new
helloApp.run