I happened a very strangely problem. Sometimes it appears and I really don't know the reason. And sometimes it disappears and I also don't know why. My console prints the following infomation but it doesn't seem any other problems. Program is still running and the result is correct. Only print infomation.
Infomation fragment is printed as the following:
javax.xml.transform.TransformerConfigurationException: javax.xml.transform.TransformerException: java.net.MalformedURLException
at org.apache.xalan.processor.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:964)

at net.sf.hibernate.xml.XMLDatabinder.getOutputStyleSheetTemplates(XMLDatabinder.java:254)

at net.sf.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:160)

at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:720)