在写hibernate.cfg.xml的配置文件时，在文件的标头部分，会出现这个黄色感叹号，提示The file cannot be validated as there was a connection problem
即，因为连接问题不能通过验证，这样我们就无法使用eclipse的自动提示功能！解决的办法其实很简单，就是换个标头，换成即可
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
（转）hibernate.cfg.xml：The file cannot be validated as there was a connection problem
原文：http://www.cnblogs.com/com-wushuang/p/4944779.html
