sample.web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <display-name>JRuby Application Template</display-name>
    <description>
	    Sample deployment descriptor for a JRuby on Rails application.
    </description>
    
    <!-- Rails (threadsafe! due max.runtimes == 1) configuration : -->
    
    <context-param>
        <param-name>rails.env</param-name>
        <param-value>production</param-value>
    </context-param>

    <context-param>
        <param-name>jruby.min.runtimes</param-name>
        <param-value>1</param-value>
    </context-param>
    <context-param>
        <param-name>jruby.max.runtimes</param-name>
        <param-value>1</param-value>
    </context-param>

    <filter>
        <filter-name>RackFilter</filter-name>
        <filter-class>org.jruby.rack.RackFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>RackFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <listener>
        <listener-class>org.jruby.rack.rails.RailsServletContextListener</listener-class>
    </listener>

    <!-- Worker setup including optional configuration parameters : -->

    <!-- declaratively configure a worker (with built-in support) : -->
    <context-param>
        <param-name>jruby.worker</param-name>
        <param-value>resque</param-value> <!-- delayed_job -->
    </context-param>
    <!-- alternatively use an (arbitrary) inline worker script : -->
    <!--
    <context-param>
        <param-name>jruby.worker.script</param-name>
        <param-value>
            require 'delayed/jruby_worker'; 
            Delayed::JRubyWorker.new.start
        </param-value>
    </context-param>-->
    <!-- if you script is to be loaded from a (.rb) file use : -->
    <!--
    <context-param>
        <param-name>jruby.worker.script.path</param-name>
        <param-value>delayed/start_worker.rb</param-value>
    </context-param>-->
    <!-- note that jruby.worker.script and jruby.worker.script.path params are 
         mutually exclusive and jruby.worker.script takes precedence ! -->
    <!-- if one worker thread is not enough, increase the value (defaults to 1) : -->
    <context-param>
        <param-name>jruby.worker.thread.count</param-name>
        <param-value>1</param-value>
    </context-param>
    <!-- you might also change the worker thread's priority (use with caution) : -->
    <!-- accepted values are MIN, MAX, NORM and values <1..10> (default is NORM) -->
    <context-param>
        <param-name>jruby.worker.thread.priority</param-name>
        <param-value>NORM</param-value><!-- NORM == 5, MIN == 1, MAX == 10 -->
    </context-param>

    <!-- worker specific configuration parameters (in this case for resque) : -->
    <context-param>
        <param-name>QUEUES</param-name>
        <param-value>mails,posts</param-value>
    </context-param>
    <context-param>
        <param-name>INTERVAL</param-name>
        <param-value>1.5</param-value>
    </context-param>

    <!-- mandatory - make sure it's declared after the org.jruby.rack... listener : -->
    <listener>
        <listener-class>org.kares.jruby.rack.WorkerContextListener</listener-class>
    </listener>

</web-app>