Axis2 Web Service pass objects

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Java

webservice

Hi all,
I am trying to use Axis2 to deploy web service.
The primitives parameters are working correctly, but when I use customizing objects, it doesn't work.
For example, I have defined an object:
class Ab01{
int a1;
String b1;
}

I created an instance of this class and pass the instance as web service's parameter, this doesn't work.
Actually, I cannot find any info about a1 and b1 in WSDL.
Can anyone help me?