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

用dbutils连接的时候出现这个问题

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.xxx.blog.BlogServlet.doPost(BlogServlet.java:65)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause

java.lang.ClassNotFoundException: org.apache.commons.dbutils.QueryRunner
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
	java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
	com.afoa.blog.BlogServlet.doPost(BlogServlet.java:65)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs

一般都是因为项目中导入了dbutils的包，但是tomcat6.0的lib中没有导入dbutils的包引起的。注意tomcat需要重启一下的