配置数据源后，为何无法加载数据库驱动程序？

[myjoy7749]

服务器是Tomcat,以前我用JDBC连接Mysql数据库正常，刚才试了一下用数据源来连接，却出现如下错误，想向各位请教一下是什么原因：

exception

javax.servlet.ServletException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.show_jsp._jspService(show_jsp.java:256)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause

org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:766)
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
guest.DB.getConnection(DB.java:19)
guest.DB.getItemNumber(DB.java:105)
org.apache.jsp.show_jsp._jspService(show_jsp.java:109)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

[myjoy7749]

up

[hugoon]

是JDBC的驱动文件（在Program Files\Microsoft SQL Server 2000 Driver for JDBC\lib下的msbase.jar，mssqlserver.jar，mssqlserver.jar）路径没写好吧！楼主在系统变量那里看看先！

[xuchaoyang]

tomcat要把你的JDBC拷到comman/lib下的
你 试试 呵呵