To Find Java Object Size using serialization

Question

I have been struggling for finding the exact size of java objects. I have tried different options and non of them are working correctly. Then I tried to serialize the object and find the size of the serialized object. The size of the serialized object is very small, like in few kilo byte. So I doubted my method. I was wondering is it the correct way? Is there any problem you people see in this procedure? Please help...

What makes you think your object is larger than a few kilobytes? — user207421
– user207421, Commented Jan 6, 2015 at 7:17
The serialized size of an object is not the same as the amount of memory it consumes on the Java heap. — Louis Wasserman
– Louis Wasserman, Commented Jan 6, 2015 at 19:22

Parth Soni · Accepted Answer · 2015-01-06 07:03:26Z

1

You can convert your object into a byte array using ObjectOutputStream and ByteArrayOutputStream:

public static int sizeof(Object obj) throws IOException {

    ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteOutputStream);

    objectOutputStream.writeObject(obj);
    objectOutputStream.flush();
    objectOutputStream.close();

    return byteOutputStream.toByteArray().length;
}

edited Jan 6, 2015 at 7:03

Parth Soni

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answered Jan 6, 2015 at 6:58

aurelius

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