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Why is that?
Do you mean you need to write code to catch an exception or to pass the handling of the exception to a higher level?

What are the classes you are using?
There is a file writing class with append mode.

What is the "it"?

What are the classes you are using?

you don't read with a bufferwriter.

One of the file writing classes has a constructor that has an extra boolean parameter the specifies if the file should be appended to instead of overwritten. ...

Yes, you can write to any allowed location on the PC with a java program running from a jar file.