Preventing null values ​​inside object property using jersey

I am using jersey to serialize responses in a web service. I don't want the service to return null values, so I use the appropriate annotation, for example:

@JsonInclude(Include.NON_NULL)    
class City{
   String name;
   Stat stats;  
}

      

        
        
        
      

    

And the Stat class looks like this:

class Stat{
   int population;
   int femalePopulation;
   int malePopulation;
}

      

        
        
        
      

    

I don't want the properties from Stat to show up if they are zero. But for some reason I keep getting them. I tried using @JsonInclude(Include.NON_NULL)

in class Stat

but it doesn't work :(

Any help would be appreciated.

EDIT:

Sorry, my example was not the best. I know primitive types have default values. I tried to add annotation to the Stat class, but this is not for me: /

class Stat{
   Integer population;
   Integer femalePopulation;
   Integer malePopulation;
}