java - GSON exclusionStrategy shouldSkipField need to know field's concrete class

Question

I am having trouble with GSON exclusionStrategy implemenation.I need to implement GSON serialization filtering based on template. in GSON. in GSON exclusionStrategy , shouldSkipField , I need to know field's concrete class, where am I in class hierarchy

My class structure is as following:-

class A{ 
        String id; 
} 

class B{ 
        String bb; 
        String bbb; 
} 

class c extends A{ 
       String cVal; 
       B bObj; 
} 

I want to access 'id' field via class c, but id field's declaring class comes as A instead of c.

Thanks in advance, Preeti