初学hibernate，一个异常总是解决不了

Question

hibernate.xml 和 Student.hbm.xml分别如下。<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property> <!-- JDBC connection pool (use the built-in) -->
<!--
<property name="connection.pool_size">1</property>
--><!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Enable Hibernate's automatic session context management -->
<!--<property name="current_session_context_class">thread</property>--> <!-- Disable the second-level cache  -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup -->
<!--<property name="hbm2ddl.auto">update</property>--> <mapping resource="com/bjsxt/hibernate/model/Student.hbm.xml" /> </session-factory></hibernate-configuration>
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.bjsxt.hibernate.model">
<class name="Sdutent">
<id name="id"></id>
<property name="name"></property>
<property name="age"></property>
</class>
</hibernate-mapping>javabeanpackage com.bjsxt.hibernate.model;public class Student {
private int age;
private int id;
private String name;
public int getAge() {
return age;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public void setAge(int age) {
this.age = age;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
}测试代码import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;import com.bjsxt.hibernate.model.Student;
public class StudentTest {
public static void main(String[] args){
Student student=new Student();
student.setId(1);
student.setName("s1");
student.setAge(19);

Configuration cfg=new Configuration();
SessionFactory sf=cfg.configure().buildSessionFactory();
Session session=sf.openSession();
session.beginTransaction();
session.save(student);
session.getTransaction().commit();
session.close();
sf.close();
}
}错误信息如下Exception in thread "main" org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/bjsxt/hibernate/model/Student.hbm.xml
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:3951)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXmlQueue(Configuration.java:3940)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3928)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1368)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1826)
at StudentTest.main(StudentTest.java:16)
Caused by: org.hibernate.MappingException: class com.bjsxt.hibernate.model.Sdutent not found while looking for property: id
at org.hibernate.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:232)
at org.hibernate.mapping.SimpleValue.setTypeUsingReflection(SimpleValue.java:316)
at org.hibernate.cfg.HbmBinder.bindSimpleId(HbmBinder.java:451)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:384)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:323)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:174)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:3948)
... 5 more
Caused by: java.lang.ClassNotFoundException: com.bjsxt.hibernate.model.Sdutent
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:228)
... 11 more

Answer 1

hibernate-mapping package="com.bjsxt.hibernate.model">
    <class name="Sdutent">
        <id name="id"></id>
        <property name="name"></property>
        <property name="age"></property>
    </class>
</hibernate-mapping>写错类名了
package com.bjsxt.hibernate.model;public class Student {
    private int age;
....以后多注意

Answer 2

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.bjsxt.hibernate.model">
    <class name="Sdutent">
        <id name="id"></id>
        <property name="name"></property>
        <property name="age"></property>
    </class>
</hibernate-mapping>
class com.bjsxt.hibernate.model.Sdutent not found while looking for property: id类名写错了！！！