java serialization and deserializaion -

i have created simple program serializes string input cmd .ser file.. part of requirement program must able append new input , able read new input plus old input.. streamcorruptedexception if read after 2nd input..

here run on cmd.. how solve streamcorruptedexception , why happen??. codes given below.

c:\users\msi\desktop\codes java>java writefile cc.ser enter text , press ^z or ^d end. hah haha hahaha try ^z  c:\users\msi\desktop\codes java>java writefile cc.ser enter text , press ^z or ^d end. asd asd asd asd asd ^z  c:\users\msi\desktop\codes java>java readfile cc.ser 1: haha 2: haha 3: hahaha  4: hahaha error : java.io.streamcorruptedexception: invalid type code: ac     @ java.io.objectinputstream.readobject0(objectinputstream.java:1375)     @ java.io.objectinputstream.readobject(objectinputstream.java:370)     @ readfile.main(readfile.java:23) 

writefile.java:

 import java.io.*;  public class writefile implements java.io.serializable  { public static void main(string args[])       {            try         {            file myfile = new file(args[0]);             bufferedreader br = new bufferedreader                                           (new inputstreamreader(system.in));                objectoutputstream oos = new objectoutputstream                                           (new fileoutputstream(myfile,true));             system.out.println("enter text , press ^z or ^d end.");             string str;             while ((str = br.readline()) != null)              {                      oos.writeobject(str);             }              br.close();            oos.close();         }          catch (ioexception i)         {             i.printstacktrace();         } }} 

readfile.java:

import java.io.*;     public class readfile     {        public static void main(string args[])     {          try         {         int ctr = 0;          file myfile = new file(args[0]);              objectinputstream ois = new objectinputstream                                                 (new fileinputstream( myfile ));          string str;                 while ((str = (string)ois.readobject()) != null)              {                    system.out.println(++ctr + ": " + str);              }              ois.close();                 }          catch (eofexception ex)         {           system.out.println("\nend of file reached ");         }            catch (classnotfoundexception c)         {           system.out.println("the error : ");           c.printstacktrace();         }catch (ioexception i)         {           system.out.println("the error : ");           i.printstacktrace();         }      }} 

this exception occurs whenever u trying create new outputstream object existing input stream/trying read before written in case ,the control information read object stream violates internal consistency checks.

use single oos , ois life of socket, , don't use other streams on socket.

also u might want implement same using threads in same program.

if want forget you've written, use objectoutputstream.reset().