[rules-users] verifying 'is not null' in decision table?

[HonorGod]

How can I verify if my condition attribute is not null in decision table?

I have a class -

Public Class Person {

String firstName = null;
String lastName = null ;

}

In my decision table I have to check if firstName and lastName are not null
and then fire actions.

How I can do this? I know I can get that through drl.

Thanks

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