New to Java

I have the following code to read from .ser file.

File file = new File("/home/dhans/travelcache/test.ser");
ObjectInputStream is = new ObjectInputStream(
     new BufferedInputStream(new FileInputStream(file)));

and i am reading from the input stream by

is.readObject();

my question is how to find out whether end of file is reached using
ObjectInputStream.i tried with something like the following

while(is.readObject() != null) {
 // do something
}

but no use it is throwing java.io.EOFException if EOF is reached.
Is there a method/way to test whether end of file is reached.
any help would be helpful
tia,
dhanasekaran