that’s great…

   <!--    Our custom system initializing listener     -->
   <listener>
      <listener-class>com.some.company.SomeInitListener</listener-class>
   </listener>

public class SomeInitListener extends BosenInitListener {

	private static final Logger LOG = Logger.getLogger(SomeInitListener.class);

	@Override
	protected void customInitForServlet(ServletContextEvent event) {
		super.customInitForServlet(event);

		ServletContext servletContext = event.getServletContext();
		SomeResourceInitializer resourceInitializer = (SomeResourceInitializer) getBean(servletContext, "resourceInitializer");

		// Make default menus
		String menuConfig = servletContext.getInitParameter(AppConstants.MENU_CONFIG);
		if (null != menuConfig) {
                    ...
		} else {
			LOG.warn("Could not find a menu configuration.");
		}

		resourceInitializer.init();
	}
}

public abstract class BosenInitListener implements ServletContextListener, HttpSessionListener {

	private static final Logger LOG = Logger.getLogger(BosenInitListener.class);

	public final void contextInitialized(final ServletContextEvent event) {
		String servletContextName = event.getServletContext().getServletContextName();
		if (LOG.isInfoEnabled()) {
			LOG.info("Initializing [ " + servletContextName + " ]");
		}

		customInitForServlet(event);

		if (LOG.isInfoEnabled()) {
			LOG.info("Initialized [ " + servletContextName + " ]nn");
		}
	}

	public final void contextDestroyed(final ServletContextEvent event) {
		String servletContextName = event.getServletContext().getServletContextName();
		if (LOG.isInfoEnabled()) {
			LOG.info("Destroying [ " + servletContextName + "]");
		}

		customDestroyForServlet(event);

		if (LOG.isInfoEnabled()) {
			LOG.info("Destroyed [ " + servletContextName + "]nn");
		}
	}

	protected void customInitForServlet(final ServletContextEvent event) {
		ServletContext servletContext = event.getServletContext();
		String appContextName = WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE;
		Object webCtxAttribute = servletContext.getAttribute(appContextName);
		if (null != webCtxAttribute) {
			if (webCtxAttribute instanceof Exception) {
				LOG.error(webCtxAttribute);
			}

		} else {
			throw new IllegalStateException("Could not read applicationContext.xml.");
		}
	}

	protected void customDestroyForServlet(final ServletContextEvent event) {
		//no-op
	}

	public final void sessionCreated(final HttpSessionEvent event) {
		String sessionId = event.getSession().getId();
		if (LOG.isDebugEnabled()) {
			LOG.debug("Initializing a new Session [" + sessionId + "]");
		}

		customInitForSession(event);

		if (LOG.isDebugEnabled()) {
			LOG.debug("Initialized a new Session [" + sessionId + "]");
		}
	}

	public final void sessionDestroyed(final HttpSessionEvent event) {
		String sessionId = event.getSession().getId();
		if (LOG.isDebugEnabled()) {
			LOG.debug("Destroying an existing Session [" + sessionId + "]");
		}

		customDestroyForSession(event);

		if (LOG.isDebugEnabled()) {
			LOG.debug("Destroyed an existing Session [" + sessionId + "]nn");
		}
	}

	protected void customInitForSession(final HttpSessionEvent event) {
		//no-op
	}

	protected void customDestroyForSession(final HttpSessionEvent event) {
		HttpSession session = event.getSession();
		session.removeValue(BosenConstants.SESSION_PAGINATED_SEARCH_RESULTS);
		session.removeAttribute(BosenConstants.SESSION_PAGINATED_SEARCH_RESULTS);
	}

	protected static ApplicationContext getApplicationContext(ServletContext servletContext) {
		String appContextName = WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE;
		return (ApplicationContext) servletContext.getAttribute(appContextName);
	}

	protected static Object getBean(ServletContext servletContext, String name) {
		return getApplicationContext(servletContext).getBean(name);
	}