javascript - Display messages in JSP, When java bean class get affected? -


please don't hesitate edit question , if not clear.

currently have situation when server sends response,i need reflect message in jsp when bean class changes.

my bean class be,

public class information {      public linkedlist<string> information = null ;      public linkedlist<string> getinformation() {         return information;     }      public void setinformation(linkedlist<string> information) {         this.information = information;         system.out.println("list : "+this.information);     }   }

my thread running affect bean class , when response server

class producer extends thread{      linkedlist<string>() list = new linkedlist<string>();     information info = new information();      public void run() {          if(connectionprotocol.protocol != null){             try {                  response = connectionprotocol.protocol.receive();                 if(response != null){                     system.out.println("listener response : \n"+response+"\n");                     list.add("eventlinkeventlinkconnected event received..");                     info.setinformation(list);                 }             }         }     } }

i need display information in jsp when bean class affected or modified.

also aware of ajax , used situation every 5 sec accessing bean.i getting null if there no message in bean.and every thing works fine.

my ajax be,

function pingaction(){      $.ajax(             {                 type: "post",                 url: "pingaction",                 async:     true,                 data : "userid="+encodeuricomponent(userid)+"&securekey="+encodeuricomponent(securekey)+"&sid="+math.random() ,                 cache:false,                 contenttype: "application/x-www-form-urlencoded; charset=utf-8",                 scriptcharset: "utf-8" ,                 datatype: "html",                  error: function (xhr, ajaxoptions, thrownerror) {                 //alert("status :"+xhr.status+"\nthrownerror : "+thrownerror+"\nresponsetext : "+xhr.responsetext);                 xhr.abort();              },              success: function( responsedata , status){                 //alert("pingaction response data : "+ responsedata +"\nstatus : "+status);                  if(responsedata != "null" && responsedata.length != 0  && responsedata != null){                      //process view response in jsp                 }             } ,              complete:function(){                 timer = settimeout(pingaction, 5000);             }              }                                );  }

but there empty response coming when server didn't send message added in list.because calling pingaction() function every 5 sec.

good answers appreciated.


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