JAXB return null instead empty string

Question

How I can retrieve null value, when unmarshalling, if inside XML attribute value is empty ? Now I make inside my getters checking for null :

Answer 1

I think your XML looks more or less like this:

This, unfortunately, means, that you are passing an empty string.

If you want to pass null you have two options:

1. Do not pass this tag at all (your XML should not contain tag at all).
2. Use xsi:nil.

If using xsi:nil, first you have to declare your xml element (in XSD file) as nilable, like this:

Then, to pass the null value inside XML do this:

or this:

This way, JAXB knows, that you are passing null instead of an empty String.