Pull all fields with annotation (including fields inside an object in another and fields in inner classes)

Hi I am creating a custom Excel parsing marshaller tool, you can reference this: How can I call getter/setter for property marked with custom annotation?

What I need now is to be able to find all annotations, specifically how can I find ones that nested objects or inner classes, and then call that setter/getter.

For example:

public class MyOuterClass
{
   private InnerClass innerObject;

   public void setInnerObject (InnerClass innerObject)
   {
        this.innerObject = innerObject;
   }

    public InnerClass getInnerObject ()
    {
        return innerObject;
    }
}

public class InnerClass
{
   //I need to get this field and call its setter from the class passed in, so something like:
   // MyOuterClass outClass; outClass.getInnerObject.setFieldIWant("field")
   // OR outClass.getInnerObject.getFieldIWant
   // But have to be able to do at run time, having no knowledge of the class inside
   // This must also work for a nested class
   @ExcelColumn
   private String fieldIWant;

   public void setFieldIWant(String fieldIWant)
   {
        this.fieldIWant = fieldIWant;
   }

    public String getFieldIWant ()
    {
        return fieldIWant;
    }
}