java.lang.IllegalStateException: Errors/BindingResult argument declared without preceding model attr

BindingResult必须紧跟@ModelAttribute的后面

必须写成这种方式：

public String add(@Valid RoleBO role, BindingResult binding,
Map<String, Object> request) 

写成如下方式，就会出现这个异常

public String add(@Valid RoleBO role, Map<String, Object> request),
BindingResult binding