比如下面的代码：
<!-- 下面也是用到了el表达式来取值回显，不过取的是对象的属性所以一般用${param['customer.cust_id']}但是也可以用s标签来取值 -->
<input type="hidden" name="customer.cust_id" id="cust_id" value="${param['customer.cust_id']}" />这个注释里面我加了${param['customer.cust_id']},然后就导致错误，错误如下：
Type Exception Report
Message org.apache.jasper.JasperException: Unable to compile class for JSP
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to compile class for JSP
把注释里面的表达式${param['customer.cust_id']}删除就没有这样的错误了！！！