Find references to method invocations in java to clean up unused pojo fields using reflection

I have a fat pojo java class with a huge amount of fields / getters & setters. Some of those fields are no longer being used and I'd like to clean-up that class. I don't know much about reflection but I would like to be able to programatically identify fields that are no longer being referenced in another class.

The way to identify if a field needs to be cleaned up is to see if the field's setter method is being invoked in another, if not, its a candidate for clean-up.

I got as far as figuring out how to extract methods and field names using reflection, but I don't know where to begin identifying those fields whos setters are not referenced in another class's execution.

public class GetterSetterReflec {

public static void main(String args[]){
    printGettersSetters(SearchEngineClientModel.class);
}

public static void printGettersSetters(Class<?> aClass)
{
      Method[] methods = aClass.getMethods();

      Field[] fields = aClass.getDeclaredFields();
      for(Field field : fields){
          System.out.println(field);
      }

      for(Method method : methods){
        if(isGetter(method)) System.out.println("getter: " + method);
        if(isSetter(method)) System.out.println("setter: " + method);
      }
}

    public static boolean isGetter(Method method){
      if(!method.getName().startsWith("get"))      return false;
      if(method.getParameterTypes().length != 0)   return false;  
      if(void.class.equals(method.getReturnType()))
              return false;
      return true;
    }

    public static boolean isSetter(Method method){
      if(!method.getName().startsWith("set")) return false;
      if(method.getParameterTypes().length != 1) return false;
      return true;
    }

}

I'd be grateful for any help you can provide. Thank you in advance!