只是一个Hibernate的demo，出现这样的问题
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.exception.DataException: could not insert: [com.hibernateinaction.hello.Message]

想问问各位老师，这个异常可能是什么原因引起的

[解决办法]
那就好