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This exception has no message.
java.lang.NullPointerException at net.sf.hibernate.util.StringHelper.qualify(StringHelper.java:239) at net.sf.hibernate.cfg.Binder.bindComponent(Binder.java:734) at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:263) at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1173) at net.sf.hibernate.cfg.Configuration.add(Configuration.java:245) at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:268) at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:291) at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:935) at net.sf.hibernate.cfg.Configuration.doConfigure(Configuration.java:890) at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:826) at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:812) at org.ifmc.qw.hibernate.HibernateSession.init(HibernateSession.java:44)