java - How to identify if ObjectInputStream has available object? -


getting error nullpointerexception while trying identify if serialized object available , receive using socket. how identify if objectinputstream has available object? firs off try read text try read same socket lot object ()which may not there.

        public class threadin extends thread{         bufferedreader in;             printstream outconsole;             socket socket;             objectinputstream ois;             string str;             lot lot; threadin(bufferedreader input, printstream inoutput, socket s){         str = "";         in= input;         socket= s;         try {             ois = new objectinputstream(socket.getinputstream());         } catch (ioexception e) {             e.printstacktrace();         }          outconsole = inoutput;      }     public void run() {              while(!exit_thread){             try {         if(in.ready()){             try {                 str= in.readline();                     thread.sleep(100);                 } catch (ioexception e) {                 exit_thread= true;                 break;                 } catch (interruptedexception e) {                     e.printstacktrace();                 }                 outconsole.println("received:"+str);                      }                 } catch (ioexception e) {                     e.printstacktrace();                 }             try {                 if((lot)ois.readobject() != null){                           lot = (lot)ois.readobject();                      if (lot!=null){outconsole.println(lot.tostring());}                      outconsole.println((string)ois.readobject());                         }                     } catch (exception e) {                         e.printstacktrace();                     }     } 

if((lot)ois.readobject() != null)

this part reads object socket., reading 3 times object socket in code. if have 1 object coming in socket, or more, can read object , catch exception!. below

 //..loop start          try {                 lot = (lot)ois.readobject();               }          catch (exception e)             {  //      handling, skip object! put continue: or              }     //do ever want `lot`      //..loop end

and now, per code, have not initialized objectinputstream object.

do objectinputstream ois = new objectinputstream(socket.getinputstream());

if omitted code here, mistake, else pls initialize socket also!


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