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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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package org.python.util;

import java.util.Properties;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * Initializes the jython runtime inside a servlet engine. Should be used with {@link PyFilter} to
 * initialize the system before the filter starts. Add the following to web.xml to run the
 * initializer:
 *
 *  *   <listener>
 *       <listener-class>org.python.util.PyServletInitializer</listener-class>
 *       <load-on-startup>1</load-on-startup>
 *   </listener>
 *
 *
 * To use modules from Python's standard library in servlets and filters initialized by this
 * listener, either add the standard library to the lib directory in WEB-INF, or add python.home as
 * a context-param. The latter can be done by adding the following to web.xml:
 *
 *  * <context-param>
 *     <param-name>python.home</param-name>
 *     <param-value>/usr/local/jython-2.5</param-value>
 * </context-param>
 * 
 */
public class PyServletInitializer implements ServletContextListener {
    public void contextInitialized(ServletContextEvent evt) {
        PyServlet.init(new Properties(), evt.getServletContext());
    }

    public void contextDestroyed(ServletContextEvent evt) {}
}