tomcat5.0+dbcp问题，着急！！

Question

我用的是ｔｏｍｃａｔ5.0，数据库连接用的TOMCAT自带的连接池DBCP，最早的时候是可以的，可某天突然出错了，死活就不行了，出错信息如下，请大侠指点。在线等！
Cannot create JDBC driver of class 'oracle.jdbc.driver.OracleDriver' for connect
 URL 'jdbc:oracle:thin:@××××××××:1521:×××'。（为保安全，此处用×代替）
java.lang.NoClassDefFoundError
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:219)
        at java.sql.DriverManager.getCallerClass(DriverManager.java:440)
        at java.sql.DriverManager.getDriver(DriverManager.java:225)
        at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSou
rce.java:773)
        at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource
.java:540)
        at org.apache.jsp.swdjs.menu_jsp.CreateConn(menu_jsp.java:32)
        at org.apache.jsp.swdjs.menu_jsp._jspService(menu_jsp.java:231)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:311)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
01)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:742)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(Applica
tionDispatcher.java:506)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationD
ispatcher.java:443)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDis
patcher.java:359)
        at org.apache.jsp.swdjs.index_jsp._jspService(index_jsp.java:248)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:311)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
01)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:257)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:195)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
578)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:564)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:20
6)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:828)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:700)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:584)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:683)
        at java.lang.Thread.run(Thread.java:534)

Answer 1

在这里只能看出是jdbc的连接出错了。具体也不清楚，贴上代码看一下。

Answer 2

jdbc驱动common/lib里面都有的
是不是和下面的应用lib下的驱动有冲突？
还有问一下，ｊｎｄｉ配置的名称是不是全局的？
不同的应用下的datasource可不可以重名？

Answer 3

在同一个连接池里，若有多个数据源，jndi不能相同

Answer 4

class12.jar丢失了？或是数据库出问题了？