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

Because of the precise format of the serialized file, appending will indeed corrupt it. You have to write all objects to the file as part of the same stream, or else it will crash when it reads the stream metadata when it's expecting an object.

You could read the Serialization Specification for more details, or (easier) read this thread where Roedy Green says basically what I just said.