java.lang.ClassCastException:cn.itcast.domain.Role cannot be cast to java.util.List

java.lang.ClassCastException:cn.itcast.domain.Role cannot be cast to java.util.List
java.lang.ClassCastException:cn.itcast.domain.Role cannot be cast to java.util.List

java.lang.ClassCastException:cn.itcast.domain.Role cannot be cast to java.util.List
类型转换错误,肯定是强制转换的时候出错了
比如
List list=(List)obj;
本来obj是 Role类的实例,结果强制转换成list类型,就会报这种错