hibernate简单程序测试出现如下问题

[code="java"]package test;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

import cn.com.lrs.model.Student;

public class StudentTest {

public static void main(String[] args) {
    Student s = new Student();
    s.setId(1);
    s.setName("s1");
    s.setAge(1);

    Configuration cfg = new Configuration();
    SessionFactory sf = cfg.configure().buildSessionFactory();
    org.hibernate.Session session = sf.openSession();
    session.beginTransaction();

    session.save(s);

    session.getTransaction().commit();
    session.close();
    sf.close();


}

}
[/code]
运行后出现如下问题:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:687)
at org.hibernate.mapping.Table.setName(Table.java:172)
at org.hibernate.cfg.Mappings.addTable(Mappings.java:190)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:312)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:295)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:166)
at org.hibernate.cfg.Configuration.add(Configuration.java:716)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:551)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:613)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1635)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1603)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1582)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1556)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1476)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
at test.StudentTest.main(StudentTest.java:17)

映射文件中name长度为0？