How do I add data to an existing file, without having to create a new one?

Hi,
I made a servlet which is supposed to write the word "new" in a file everytime the server creates an instance:
File chatInfos = new File("LOCATION_OF_THE_FILE/infos.dat");
   if(chatInfos.exists()) {
    try {
    FileOutputStream fos = new FileOutputStream(chatInfos);
    ObjectOutputStream os = new ObjectOutputStream(fos);
    os.writeObject("new");
    os.close();
    fos.close();
    } catch(IOException e){};
   }But it doesnt work. It seems like that every time the old file is destroyed and a new one is created. But I dont want that. I simply want to add a new object to the file.
thanx

http://java.sun.com/j2se/1.4.1/docs/api/java/io/FileOutputStream.html#FileOutputStream(java.io.File, boolean)
Kind regards,
Levi

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