hibernate调用tomcat的mysql遇到问题？有那位大侠帮忙看看吗？

2005-11-11 23:45:27 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2005-11-11 23:45:27 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 2188 ms
2005-11-11 23:45:28 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2005-11-11 23:45:28 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.0.28
2005-11-11 23:45:28 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2005-11-11 23:45:28 org.apache.catalina.loader.WebappClassLoader validateJarFile
信息: validateJarFile(E:\eclipse\workspace\hr\WebContent\WEB-INF\lib\j2ee.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
org.hibernate.exception.GenericJDBCException: Cannot open connection
at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:92)
at org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:80)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:301)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:110)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:137)
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:49)
at org.hibernate.transaction.JDBCTransactionFactory.beginTransaction(JDBCTransactionFactory.java:24)
at org.hibernate.jdbc.JDBCContext.beginTransaction(JDBCContext.java:271)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1079)
at com.eeerate.db.HibernateUtil.beginTransation(HibernateUtil.java:99)
at com.eeerate.dao.DAOUtil.getPOBySQLQueryStrWithState(DAOUtil.java:276)
at com.eeerate.biz.SelectOptionUtil.feedSelectOption(SelectOptionUtil.java:205)
at com.eeerate.biz.SelectOptionUtil.<clinit>(SelectOptionUtil.java:112)
at com.eeerate.web.servlet.InitServlet.init(InitServlet.java:48)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1029)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4013)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4357)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
at org.apache.catalina.core.StandardService.start(StandardService.java:480)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:780)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:59)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:298)
... 28 more
Caused by: java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(Unknown Source)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:773)
... 31 more
org.hibernate.exception.GenericJDBCException: Cannot open connection
at org.hibernate.exception.ErrorCodeConverter.handledNonSpecificException(ErrorCodeConverter.java:92)
at org.hibernate.exception.ErrorCodeConverter.convert(ErrorCodeConverter.java:80)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:301)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:110)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:137)
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:49)
at org.hibernate.transaction.JDBCTransactionFactory.beginTransaction(JDBCTransactionFactory.java:24)
at org.hibernate.jdbc.JDBCContext.beginTransaction(JDBCContext.java:271)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1079)
at com.eeerate.db.HibernateUtil.beginTransation(HibernateUtil.java:99)
at com.eeerate.dao.DAOUtil.getPOBySQLQueryStrWithState(DAOUtil.java:276)
at com.eeerate.biz.SelectOptionUtil.feedSelectOption(SelectOptionUtil.java:205)
at com.eeerate.biz.SelectOptionUtil.rebuildSelectOption(SelectOptionUtil.java:364)
at com.eeerate.web.servlet.InitServlet.init(InitServlet.java:48)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1029)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:862)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4013)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4357)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
at org.apache.catalina.core.StandardService.start(StandardService.java:480)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:780)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:59)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:298)
... 28 more
Caused by: java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(Unknown Source)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:773)
... 31 more