EOFexception in Java when reading objectinputstream

Question

I want to read multiple objects (my own class Term) that I have output to a .dat file, but I always get a nullPointException or EOFException.

ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream(masterFile));
        Object o = null;
        while(( o = inputStream.readObject()) != null){
            Term t = (Term)o;
            System.out.println("I found a term");
        }

If you get an EOFException, it's probably because you've reached the end of the file. — Anon.
– Anon., Commented Feb 22, 2010 at 0:39
I've tried this and I only ever get EOFException. Under what circumstances do you get NullPointerException? — lins314159
– lins314159, Commented Feb 22, 2010 at 1:18
Possible duplicate of stackoverflow.com/questions/18451232/… — Raedwald
– Raedwald, Commented Mar 25, 2016 at 17:30

user207421 · Accepted Answer · 2018-10-26 08:46:50Z

6

See the Javadoc. readObject() doesn't return null at EOF. It throws EOFException. The only way it can return a null is if you wrote a null at the other end, and that's not necessarily a good reason for terminating the read loop.

In short your code is wrong.

NB the initialization of 'o' is redundant.

NB (2) The code you posted cannot throw NullPointerException, unless masterFile is null. Is that a serious report or just a guess?

edited Oct 26, 2018 at 8:46

answered Feb 22, 2010 at 1:44

user207421

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2 Comments

Luiggi Mendoza Over a year ago

How do you solve the EOFException problem? Should I wrap the code in a try/catch block and wait for the exception to arise>

user207421 Over a year ago

It's not a 'problem', it's an exception. Catch it.

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