JFinal：java.math.BigDecimal cannot be ca?报错

@JFinal 你好，想跟你请教个问题：

我在做一个购物车测试功能,小计金额时报错如下:

 java.math.BigDecimal cannot be cast to java.lang.Float

数据后台的表price字段的类型如下:

Name      Type         Length        Decimals

price       decimal      10                2      

qty的int型与price中的Float型相乖报错，应如何解决?,thks.

public class Gallery extends Model<Gallery> {
  public static final  Gallery dao=new Gallery();
  
}

package com.demo.car;

import com.demo.gallery.Gallery;

public class CarItem {
	private Gallery  gallery;
	private int qty;
	private float  totalPrice;
	
	public CarItem(Gallery  gallery,int qty){
	   super();
       this.gallery=gallery;
       this.qty=qty;
	}
	
	
	public Gallery getGallery() {
		return gallery;
	}
	public void setGallery(Gallery gallery) {
		this.gallery = gallery;
	}
	public int getQty() {
		return qty;
	}
	public void setQty(int qty) {
		this.qty = qty;
	}
	public float  getTotalPrice() {
		this.totalPrice=this.qty*this.gallery.getFloat("price"); // 此处报错
		return totalPrice; 
	}
	
	public Float getPrice(){
		return this.gallery.getFloat("price");
	}
	

}