I am creating a class object and then serializing it using the following code.

ByteArrayOutputStream ostream = new ByteArrayOutputStream(1024);
ObjectOutputStream ooutput = new ObjectOutputStream(ostream);

ooutput.writeObject(originalObject);

ooutput.flush();
ostream.close();

byte[] inBuffer = ostream.toByteArray();
ByteArrayInputStream istream = new ByteArrayInputStream(inBuffer);
ObjectInputStream oinput = new ObjectInputStream(istream);

Object serialized = oinput.readObject();

istream.close();

After the serialization I check whether both the object are similar using the following code.

assertEquals(MISMATCH_ERROR, original, serialized);

For some objects, I am recieving the following error.

Serialized/Deserialized object not the same as original object! expected: but was:

In Some cases, I get the whole object listed instead of the object id. In such cases, when I manually compare the values, they are all the same.
Why do I get this error?

Thanks in Advance.
RK