org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'

Hi When I try to connect to the datasource using JNDI, I am getting this error: [org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class \'\' for connect URL \'null\'

深圳蓝与白快餐店？