java泛型类继承问题?

//GeoResult 类
public class GeoResult<T> implements Serializable {
    private static final long serialVersionUID = 1637452570977581370L;    
    private final T content;    private final Distance distance;   
     public GeoResult(T content, Distance distance) {
        Assert.notNull(content, "Content must not be null!");
        Assert.notNull(distance, "Distance must not be null!");        
        this.content = content;        
        this.distance = distance;
    }
}
//通过继承扩展GeoResult类
public class GeoExtendResult<T> extends GeoResult<T> implements Serializable{
 
    public GeoExtendResult(T content, Distance distance) {
        super(content, distance);
    }
}

//这是正确的
List<GeoResult<RedisGeoCommands.GeoLocation<String>>> geoResultList =  radiusGeo.getContent();

//报类型不匹配
List<GeoExtendResult<RedisGeoCommands.GeoLocation<String>>> geoResultList =  radiusGeo.getContent();