//Annotation configuration dwr servletprivate void initializeDwrServlet(ServletContext container) 
{DwrServlet dwrServlet = new DwrServlet();
ServletRegistration.Dynamic dynamic = container.addServlet("dwr-invoker", dwrServlet    );
dynamic.setLoadOnStartup(2);
dynamic.setInitParameter("debug", "true");
dynamic.setInitParameter("pollAndCometEnabled", "true");
dynamic.setInitParameter("activeReverseAjaxEnabled", "true");
dynamic.setInitParameter("maxWaitAfterWrite", "1800000");
dynamic.setInitParameter("disconnectedTime", "60000");
dynamic.setInitParameter("classes", dwrAnnotationClasssConfiguration());
dynamic.addMapping("/dwr/*");}
// Configure Dwr Annotation Classes,comma separatedprivate String dwrAnnotationClasssConfiguration() {
StringBuffer config = new StringBuffer();
config.append("com.g360.bean.reconsole.opcost.AnnualOpCostRequestController");
config.append(",");config.append("com.g360.bean.security.SessionExpiredParam");
return config.toString();}

@Component("sessionExpiredParam")
@RemoteProxy(creator = SpringCreator.class, scope = ScriptScope.APPLICATION, name = "remote", creatorParams = @Param(name = "beanName", value = "sessionExpiredParam"))
 public class SessionExpiredParam{ 
private static final Logger LOGGER = LoggerFactory.getLogger(SessionExpiredParam.class); 
public boolean isSessionExpire (String sessionId) { 
return null == ConstantCacheService.getCacheConstant(sessionId); }
 @RemoteMethod public void setEnableDwrUpdate(String sessionId) {
  ScriptSession scriptSession = WebContextFactory.get().getScriptSession(); 
 String jsessionId = scriptSession.getHttpSessionId(); 
String dwrSessionId = scriptSession.getId(); 
LOGGER.info(String.format("set jsessionId = [%s],dwrsession = [%s] push enabled",jsessionId,dwrSessionId)); 
ConstantCacheService.putCacheConstant(Constants.PUSH_ID+jsessionId, dwrSessionId); 
} }

<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd"><dwr> 
<allow> <create creator="new" javascript="remote" scope="application">  
 <param name="class" value="com.g360.bean.security.SessionExpiredParam"/> 
 </create> </allow></dwr>