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.HibernateException: Could not parse configuration: /hibernate.cfg.xml
        at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1500)
        at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
        at org.hibernate.cfg.Configuration.configure(Configuration.java:1420)
        at pruebaconperros.Perroprueba.main(Perroprueba.java:13)
Caused by: org.dom4j.DocumentException: Error on line 1 of document  : Content is not allowed in prolog. Nested exception: Content is not allowed in prolog.
        at org.dom4j.io.SAXReader.read(SAXReader.java:482)
        at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1490)
        ... 3 more
Java Result: 1