关于java用hibernate调用数据库的问题。

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
        at Login.jLab_loginMouseClicked(Login.java:277)
        at Login.access$000(Login.java:26)
        at Login$1.mouseClicked(Login.java:193)
        at java.awt.Component.processMouseEvent(Component.java:6270)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6032)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4630)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4460)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: org.hibernate.HibernateException: Could not parse configuration: /hibernate.cfg.xml
        at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1542)
        at org.hibernate.cfg.AnnotationConfiguration.doConfigure(AnnotationConfiguration.java:985)
        at org.hibernate.cfg.AnnotationConfiguration.doConfigure(AnnotationConfiguration.java:64)
        at org.hibernate.cfg.Configuration.configure(Configuration.java:1476)
        at org.hibernate.cfg.AnnotationConfiguration.configure(AnnotationConfiguration.java:967)
        at org.hibernate.cfg.AnnotationConfiguration.configure(AnnotationConfiguration.java:64)
        at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
        at org.hibernate.cfg.AnnotationConfiguration.configure(AnnotationConfiguration.java:961)
        at DataHandle.PluginHandle.<clinit>(PluginHandle.java:14)
        ... 23 more
Caused by: org.dom4j.DocumentException: Error on line 1 of document  : The processing instruction target matching "[xX][mM][lL]" is not allowed. Nested exception: The processing instruction target matching "[xX][mM][lL]" is not allowed.
        at org.dom4j.io.SAXReader.read(SAXReader.java:482)
        at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1532)
        ... 31 more显示上面的错误，高手帮忙看看什么问题，弄了很久了。