Question

myeclipse运行代码时出现如下问题。求解决。

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
at org.hibernate.cfg.Configuration.reset(Configuration.java:190)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:170)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:174)
at com.mwq.hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:16)
at com.mwq.hibernate.BaseDao.queryList(BaseDao.java:29)
at com.mwq.hibernate.Dao.queryManagerOfNatural(Dao.java:141)
at com.mwq.frame.LandFrame.<init>(LandFrame.java:100)
at com.mwq.PersonnelManage.land(PersonnelManage.java:32)
at com.mwq.PersonnelManage$1.run(PersonnelManage.java:26)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:144)
at org.hibernate.cfg.Environment.<clinit>(Environment.java:529)
... 16 more
算了。
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Answer 1

问题可能的原因：如果hibernate用的userLibrary, 并且该user Library设置为system library，有可能出现这个问题。
解决方法：将system library设置项去掉即可

Answer 2

缺少log4j的jar包

追问

log4j的包指的是？hibernate的新包好么

Answer 3

两种可能
1.hibernate配置文件内容有问题
2.hibernate配置文件不存在或是放错了位置

Answer 4

你好。
是Hibernate的配置文件出现了问题。