我在调试代码时遇到了这个问题出错信息如下
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.Integer
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.ClassCastException: java.lang.Integer
org.apache.jsp.personal.addEmployee_jsp._jspService(addEmployee_jsp.java:157)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
我的相关页面代码是
<select name= "deptNum " style= "width:100px ">
<option value= " "> --选择-- </option>
<%
Department dept=new Department();
DepartmentBeanDAOImpl bean = new DepartmentBeanDAOImpl();
Collection <Department> depts = bean.query(dept);
for(Department dep: depts){
System.out.println( "----====+++++ ");
%>
<option value= " <%= dep.getDeptNum()%> "> <%= dep.getDeptName()%> </option>
<% System.out.println( "----==333333=+++++ ");} System.out.println( "----2222+++++ ");%>
</select>
这一部分代码中System.out.println( "----==333333=+++++ ");这一句是可以执行的
但是System.out.println( "----2222+++++ ");一句却不能执行，请大家帮忙看一下是什么原因呀？
谢谢大家了！
------解决方法--------------------------------------------------------
System.out.println( "----==333333=+++++ ");在循环内
System.out.println( "----2222+++++ ");在循环外
所以一定是使循环里的Department dep: depts这就有问题
