Saving and loading serialized objects (StreamCorruptedException)

Question

Hello,
I am relatively new to Serialization (coming to that, a bit new to Java too) and I am having a problem with the following:
I am saving a number of serialized objects (all of the same class) in a file using the following way (the method is called multiple times to save a list of TeamMember objects):
Note: TeamMember is a custom class.
public void addTeamMember(TeamMember p) {
            outputStream = new ObjectOutputStream( new FileOutputStream( "team.dat", true ) );
            outputStream.writeObject( p );
            outputStream.flush();
            outputStream.close();
            outputStream = null;
}Then I'm trying to retrieve the objects from the file and display them. The method used is the following (it will loop through the file until found or it throws an EOFException. Is using the EOFException good practice to search through the entire file?):
public TeamMember getTeamMember(String id) {
        TeamMember currentMember = null;
        try {
            boolean found = false;           
            inputStream = new ObjectInputStream( new FileInputStream( "team.dat" ) );
            while ( !found ) {
                currentMember = (TeamMember)inputStream.readObject();
                if ( currentMember.getId().equals( id ) )
                    found = true;
            } // end while
            closeInputFile();
            return currentMember;
        } // end try
        catch ( EOFException e ) { // end of file reached
            closeInputFile();           
            return null;
        } // end catch
        catch ( IOException e ) {
            closeInputFile();
            System.err.println( e.getMessage() );
            return null;
        } // end catch
    }Now as a test, I am adding 3 members with IDs 1, 2 and 3 respectively. Then I am calling getTeamMember three times with the different IDs. With ID "1", it works fine. When I give it ID 2, it gives an IOException with message "StreamCorruptedException: invalid type code: AC".
While tracing the program, I've seen that it always gives me that error when reading past the first object saved in the file.
Am I saving the objects in a wrong way, or reading them is done incorrectly?
Any help is much appreciated.
I hope I was clear enough, and that I posted in the correct forum.
Thanks in advance.
Andrew.

Answer 1

If that is so, might you hint me for a work around?
I want to append objects in a single file, then be able to find and read an object from the file.
Thanks again.
Andrew