Null obects question

[dovle <do...@delsyne.ro>]

Hi soap-people ,

I hope you could give me an explanation about this .

Suppose I have a class X
class X 
{
	int num ;
	Y obj ;
}

and a class Y that is contained in the X class .

I send the xml from other soap client than the apache soap to apache soap 
server. But suppose I have the Y object null . My client sends the xml in the 
next form 

<x xsd:type:"ns1:X" ... >
	<num ... >10</num>
</x>

because the Y is null . I get ( from the server ) the next exception :
Error building envelope : java.lang.NullPointerException ...
Is this the correct XML form that I should send or there should be a tag for 
the Y object , even if this object is null ? 

Please answer ,
dovle .