tomcat数据源小疑点

tomcat数据源小问题
context.xml配置了数据源。。。正常。
服务器重启一次，数据源消失了。
肯定就报错了。。
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/configs/beans-jpa.xml]: Cannot resolve reference to bean 'adDataSource' while setting bean property 'dataSource';

忘了是改哪个了。。。

[解决办法]
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

你的数据库配置里，driver class没配
[解决办法]
是这个没有了？

Java code

<Resource         auth = "Container"        name = "jdbc/adbDataSource"        type = "javax.sql.DataSource"         driverClassName = "oracle.jdbc.driver.OracleDriver"        url = "jdbc:oracle:thin:@10.xx.xx.xx:1521:xxx"         username = "ad"        password = "adxxx"        maxIdle = "5"        maxWait = "5000"        maxActive = "10"/>