SpingMVC实现集合参数（Could not instantiate bean class [java.util.List]）详解编程语言

@RequestMapping(value = "/update", method = RequestMethod.POST) 
public String update(List<ProductCollocation> productCollocations ,HttpServletRequest request, RedirectAttributes redirectAttributes) { 
　　for (ProductCollocation productCollocation : productCollocations) { 
　　　　productCollocation.setModifyDate(DateUtil.getDate()); 
　　　　productCollocationService.update(productCollocation, "create_date","product","collocation","description"); 
　　} 
　　addFlashMessage(redirectAttributes, SUCCESS_MESSAGE); 
　　return "redirect:list.jhtml"; 
}

nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [java.util.List]: 

public class ProductCollocationForm { 
    List<ProductCollocation> productCollocations; 
 
    /** 
     * @return the productCollocations 
     */ 
    public List<ProductCollocation> getProductCollocations() { 
        return productCollocations; 
    } 
 
    /** 
     * @param productCollocations the productCollocations to set 
     */ 
    public void setProductCollocations(List<ProductCollocation> productCollocations) { 
        this.productCollocations = productCollocations; 
    } 
}

@RequestMapping(value = "/update", method = RequestMethod.POST) 
public String update(ProductCollocationForm productCollocationForm ,HttpServletRequest request, RedirectAttributes redirectAttributes) { 
　　　　for (ProductCollocation productCollocation : productCollocationForm.getProductCollocations()) { 
　　　　　　productCollocation.setModifyDate(DateUtil.getDate()); 
　　　　　　productCollocationService.update(productCollocation, "create_date","product","collocation","description"); 
　　　　} 
　　　　addFlashMessage(redirectAttributes, SUCCESS_MESSAGE); 
　　　　return "redirect:list.jhtml"; 
}

<td> 
　　<input type="text" name="productCollocations[${productCollocation_index}].displayName" class="text" maxlength="200"  style="width:100px"  value="${productCollocation.displayName}"/> 
　　<input type="hidden" name="productCollocations[${productCollocation_index}].id" class="text" maxlength="200" value="${productCollocation.id}"/> 
</td>