MyEclipse 用Tomcat6.0运行JSP里出现的错误，各位大侠帮看一下

[Doson]

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /detail.jsp at line 2

1: <%@ page language="java" import="java.util.*,com.dao.*,com.dao.impl.*" pageEncoding="GBK"%>
2: <%
3: request.setCharacterEncoding("GBK");
4: TopicDao topicDao= new TopicDaoImpl();//得到主题Dao的实例
5: ReplyDao replyDao = new ReplyDaoImpl();//得到回复Dao的实人例


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


root cause

java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
org.apache.jsp.detail_jsp._jspService(detail_jsp.java:65)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.

[向大牛学习人工智能]

java.lang.NumberFormatException: null
应该是
4: TopicDao topicDao= new TopicDaoImpl();//得到主题Dao的实例
5: ReplyDao replyDao = new ReplyDaoImpl();//得到回复Dao的实人例

这两行里面用到的类出现异常，贴出代码看看有没有Integer.parseInt，处理没有

[Defonds]

我的资源里有本myeclipse教程，关于tomcat、jdk安装部署介绍的尤其详细
楼主可以去看看

[oklinsong]

Integer.parseInt()有错误，找找代码里哪里用到了。

[emon123]

java.lang.NumberFormatException: null
提示的数字格式错误，估计楼主的哪个方法返回的值为null，调试看看！

[yang_zheng_2008]

在整形转换的时候传了空值，
其实在接收页面你可以先测试值是否都传过来了

[Doson]

谢谢大家了，问题搞定了……自己找出来啦