java io StreamCorruptedException invalid stream header 7371007E

Question

I have a client Server application which communicate using objects  when I send only one object from the client to server all works well  when I attempt to send several objects one after another on the same stream I get      StreamCorruptedException      Can some one direct me to the cause of this error   client write method         private SecMessage   send SecMessage   msgs             SecMessage result   new SecMessage msgs length         Socket s null        ObjectOutputStream objOut  null        ObjectInputStream objIn null        try                s new Socket  localhost  12345          objOut new ObjectOutputStream  s getOutputStream            for  SecMessage msg   msgs                        objOut writeObject msg                   objOut flush           objIn new ObjectInputStream s getInputStream            for  int i 0 i lt result length i                result i   SecMessage objIn readObject                  catch java io IOException e                 alert IO ERROR MSG   n  e getMessage                    catch  ClassNotFoundException e                  alert INTERNAL ERROR   n  e getMessage                   finally                try  objIn close     catch  IOException e            try  objOut close     catch  IOException e                   return result       server read method      in is an inputStream Defined in the server SecMessage rcvdMsgObj  rcvdMsgObj  SecMessage new ObjectInputStream in  readObject    return rcvdMsgObj    and the SecMessage Class is  public class SecMessage implements java io Serializable    private static final long serialVersionUID   3940341617988134707L   private String cmd            nothing interesting here   just a bunch of fields   getter and setters

User · Answer

This exception may also occur if you are using Sockets on one side and SSLSockets on the other  Consistency is important

User · Answer

If you are sending multiple objects  it s often simplest to put them some kind of holder collection like an Object   or List  It saves you having to explicitly check for end of stream and takes care of transmitting explicitly how many objects are in the stream   EDIT  Now that I formatted the code  I see you already have the messages in an array  Simply write the array to the object stream  and read the array on the server side   Your  server read method  is only reading one object  If it is called multiple times  you will get an error since it is trying to open several object streams from the same input stream  This will not work  since all objects were written to the same object stream on the client side  so you have to mirror this arrangement on the server side  That is  use one object input stream and read multiple objects from that    The error you get is because the objectOutputStream writes a header  which is expected by objectIutputStream  As you are not writing multiple streams  but simply multiple objects  then the next objectInputStream created on the socket input fails to find a second header  and throws an exception    To fix it  create the objectInputStream when you accept the socket connection  Pass this objectInputStream to your server read method and read Object from that

User · Answer

when I send only one object from the client to server all works well  when I attempt to send several objects one after another on the same stream I get StreamCorruptedException   Actually  your client code is writing one object to the server and reading multiple objects from the server   And there is nothing on the server side that is writing the objects that the client is trying to read

[java] java.io.StreamCorruptedException: invalid stream header: 7371007E

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