当我将后台数据传递给jsp，用${requestScope.user.Id}取值时报错，
最后发现entity实体类的属性不能首字母大写然后再小写，例如 int Age；这个就不行，必须写成int age;
最后问题解决了
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javax.el.PropertyNotFoundException: 类型[xx.xxx.xxxx]上找不到属性[xxxx]
javax.el.PropertyNotFoundException: Property 'XXX' not found on type bean.XXXXX
Field XXX in XXXX required a bean of type XXXX that could not be found
Caused by: javax.el.PropertyNotFoundException: Property 'product' not found on type java.lang.String
javax.el.PropertyNotFoundException: Property 'imgUrl' not found on type java.lang.String
javax.el.PropertyNotFoundException: Property 'cname' not found on type java.lang.String
异常：javax.el.PropertyNotFoundException: Property 'id' not found on ..........
javax.el.PropertyNotFoundException: Property 'name' not found on type java.lang.String
javax.el.PropertyNotFoundException: Property 'id' not found on type java.lang.Integer
javax.el.PropertyNotFoundException