求助，新手学hibernate4.1.4遇到问题

Question

最近学习hibernate，第一个例子就出问题了，解决了几个，有出现一个新的，这个没找到方法解决，所以来求助各位前辈！hibernate.cfg.xml的配置如下：
<?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">mysql</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.internal.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/dxd/hibernate/model/Student.hbm.xml"/>-->
        <mapping class="com.dxd.hibernate.model.Student"/>
    </session-factory></hibernate-configuration>Student.java如下：
package com.dxd.hibernate.model;import javax.persistence.Entity;
import javax.persistence.Id;@Entity
public class Student {
    private int id;
    private String name;
    private int age;
    @Id
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    
}测试类StudentTest.java如下：
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistryBuilder;import com.dxd.hibernate.model.Student;
public class StudentTest {
    public static void main(String[] args) {
        Student student=new Student();
        student.setId(1);
        student.setName("nihao");
        student.setAge(20);
        Configuration cfg=new Configuration();
        SessionFactory sf=cfg.configure().buildSessionFactory(new ServiceRegistryBuilder().buildServiceRegistry());     //这是第16行
        Session session=sf.openSession();
        session.beginTransaction();
        session.save(student);
        session.getTransaction().commit();
        session.close();
        sf.close();
    }
}另外因为之前出现过问题，加了一个hibernate.properties文件，
hibernate.connection.driver_class=com.mysql.jdbc.Driver
hibernate.connection.password=mysql
hibernate.connection.url=jdbc:mysql://localhost/hibernate
hibernate.connection.username=root
hibernate.dialect=org.hibernate.dialect.MySQLDialect出现的错误信息如下：
2012-6-18 15:19:03 org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
2012-6-18 15:19:03 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.1.4.Final}
2012-6-18 15:19:03 org.hibernate.cfg.Environment <clinit>
INFO: HHH000205: Loaded properties from resource hibernate.properties: {hibernate.connection.username=root, hibernate.connection.password=****, hibernate.dialect=org.hibernate.dialect.MySQLDialect, hibernate.connection.url=jdbc:mysql://localhost/hibernate, hibernate.bytecode.use_reflection_optimizer=false, hibernate.connection.driver_class=com.mysql.jdbc.Driver}
2012-6-18 15:19:03 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
2012-6-18 15:19:03 org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
2012-6-18 15:19:03 org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
2012-6-18 15:19:03 org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
2012-6-18 15:19:03 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
Exception in thread "main" [color=#333399]org.hibernate.service.classloading.spi.ClassLoadingException: Specified JDBC Driver com.mysql.jdbc.Driver class not found
    at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:107)
    at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
    at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223)
    at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89)
    at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2277)
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2273)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)
    at StudentTest.main(StudentTest.java:16)
Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver]
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:141)
    at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:104)
    ... 13 more
Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$1.findClass(ClassLoaderServiceImpl.java:99)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:138)
    ... 14 more[/color]

Answer 1

少mysql驱动jar包，你找一下对应的驱动Jar包，build一下就可以了！

Answer 2

Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver
提示找不到驱动,说明你的项目中缺少mysql的JDBC驱动包,加进去就好了

Answer 3

关键就是这个问题啊 ，我加了mysql-connector-java-5.1.17-bin.jar包，依然没用啊

Answer 4

就是biuld path，Add External Archives，我打算试试mysql-connector-java-5.1.20-bin.jar

Answer 5

好了，解决了，不知道为什么导入新的驱动包就可以了，不过log4j仍然没用。唉，路漫漫啊，多谢各位的帮助了，以后多多帮助啊