请问下arraylist问题如何解决

HTTP Status 500 – Internal Server Error

Type Exception Report

Message An exception occurred processing [/index.jsp] at line [23]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing [/index.jsp] at line [23]

20:           <!-- 鍟嗗搧寰幆寮�濮� -->
21:            <% 
22:                ItemsDao itemsDao = new ItemsDao(); 
23:                ArrayList<Items> list = itemsDao.getAllItems();
24:                if(list!=null&&list.size()>0)
25:                {
26: 	               for(int i=0;i<list.size();i++)