Appending to an ObjectOutputStream

Question

Is it not possible to append to an ObjectOutputStream?

I am trying to append to a list of objects. Following snippet is a function that is called whenev

Answer 1

As the API says, the ObjectOutputStream constructor writes the serialization stream header to the underlying stream. And this header is expected to be only once, in the beginning of the file. So calling

new ObjectOutputStream(fos);

multiple times on the FileOutputStream that refers to the same file will write the header multiple times and corrupt the file.