NamingException异常是什么情况?
[DEBUG] 2016-11-17 02:11:27 - JNDI lookup for name [jdbc.username] threw NamingException with message: Name [jdbc.username] is not bound in this Context. Unable to find [jdbc.username].. Returning null.
[DEBUG] 2016-11-17 02:11:27 - JNDI lookup for name [jdbc.password] threw NamingException with message: Name [jdbc.password] is not bound in this Context. Unable to find [jdbc.password].. Returning null.