Populate a Bean from Other Bean

I wanted to populate bean from other bean. Example: // this is mapped to db using hibernate. class A { string name; string age; Date dateA; B obj; } // this was mapped to db but now I'd like to populate it from class A member dateA; class B{ Date date; } When I try to set B Object, I got nullpointerexception. Any idea how to process this issue?
how you are setting the B object?

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