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That is not from an ObjectOutputStream. It looks like a text file.
Why are you using the ObjectInputStream?

There are other ways to read a text file. The Scanner class is a simple one.

How was the file you are trying to read created?
The ObjectInputStream constructor doesn't think that the file is in the correct format.

Was the file created by an ObjectOutputStream?

Is there a problem? Can you explain what it is?
Show: what the program does, why that is wrong and what you want it to do.

Copy and paste here the full text of any error messages.