javax.servlet.ServletException: Servlet execution threw an exception是什么错误啊

运行后出现以下信息
HTTP Status 500 -

type Exception report

message

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

exception

javax.servlet.ServletException: Servlet execution threw an exception

root cause

java.lang.NoClassDefFoundError: org/apache/commons/dbutils/QueryRunner
com.v512.guestbook.AddMessageServlet.doPost(AddMessageServlet.java:60)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

我用了个DbUtil组件

[b]问题补充：[/b]
有啊，放了，但是没有放jdbc的jar包
[b]问题补充：[/b]
怎么没有人看呢？那位老兄帮忙看看可以吗？

肯定这个commons dbutils包有问题，用最新版的

java.lang.NoClassDefFoundError: org/apache/commons/dbutils/QueryRunner

LZ把DBUtils的jar包放在WEB-INF\lib下了吗？

把你的运行环境下的lib目录jar包列表放出来，我看一下