java io StreamCorruptedException invalid stream header 54657374

Question

I am trying to read a string which is send from client using Socket program  The code as follows   import java io IOException  import java io ObjectInputStream  import java io ObjectOutputStream  import java lang ClassNotFoundException  import java net ServerSocket  import java net Socket   public class SocketServerExample          static ServerSocket variable     private static ServerSocket server        socket server port on which it will listen     private static int port   5000       public static void main String args    throws IOException  ClassNotFoundException            create the socket server object         server   new ServerSocket port             keep listens indefinitely until receives  exit  call or program terminates         while true               System out println  Waiting for client request                  creating socket and waiting for client connection             Socket socket   server accept                  read from socket to ObjectInputStream object             ObjectInputStream ois   new ObjectInputStream socket getInputStream                   convert ObjectInputStream object to String             String message    String  ois readObject                System out println  Message Received      message                 create ObjectOutputStream object             ObjectOutputStream oos   new ObjectOutputStream socket getOutputStream                   write object to Socket             oos writeObject  Hi Client   message                 close resources             ois close                oos close                socket close                  terminate the server if client sends exit request             if message equalsIgnoreCase  exit    break                    System out println  Shutting down Socket server                close the ServerSocket object         server close               But I am getting error as follows while reading the string from client   Exception in thread  main  java io StreamCorruptedException  invalid stream header  54657374     at java io ObjectInputStream readStreamHeader ObjectInputStream java 803      at java io ObjectInputStream  lt init gt  ObjectInputStream java 298      at SocketServerExample main SocketServerExample java 29    I searched and not managed find the bug  Please help me

User · Accepted Answer

Clearly you aren t sending the data with ObjectOutputStream  you are just writing the bytes    If you read with readObject   you must write with writeObject    If you read with readUTF   you must write with writeUTF    If you read with readXXX   you must write with writeXXX    for most values of XXX

User · Answer

You can t expect ObjectInputStream to automagically convert text into objects   The hexadecimal 54657374 is  Test  as text   You must be sending it directly as bytes

[java] java.io.StreamCorruptedException: invalid stream header: 54657374

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