hibernate4 在用annotation投射是老是出错，为什么呀

七月 24, 2012 10:36:03 上午 org.hibernate.annotations.common.Version <clinit>INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}七月 24, 2012 10:36:03 上午 org.hibernate.Version logVersionINFO: HHH000412: Hibernate Core {4.1.5.Final}七月 24, 2012 10:36:03 上午 org.hibernate.cfg.Environment <clinit>INFO: HHH000206: hibernate.properties not found七月 24, 2012 10:36:03 上午 org.hibernate.cfg.Environment buildBytecodeProviderINFO: HHH000021: Bytecode provider name : javassist七月 24, 2012 10:36:03 上午 org.hibernate.cfg.Configuration configureINFO: HHH000043: Configuring from resource: /hibernate.cfg.xml七月 24, 2012 10:36:03 上午 org.hibernate.cfg.Configuration getConfigurationInputStreamINFO: HHH000040: Configuration resource: /hibernate.cfg.xml七月 24, 2012 10:36:03 上午 org.hibernate.cfg.Configuration addResourceINFO: HHH000221: Reading mappings from resource: cn/lcc/hibernate/model/User.hbm.xmlException in thread "main" org.hibernate.MappingException: Unable to load class [ cn.lcc.hibernaet.model.MyTeacher] declared in Hibernate configuration <mapping/> entry    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2133)    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2081)    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2061)    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2014)    at org.hibernate.cfg.Configuration.configure(Configuration.java:1929)    at org.hibernate.cfg.Configuration.configure(Configuration.java:1908)    at cn.lcc.hibernate.test.HBTest.testMyTeacher(HBTest.java:54)    at cn.lcc.hibernate.test.HBTest.main(HBTest.java:107)Caused by: java.lang.ClassNotFoundException: cn.lcc.hibernaet.model.MyTeacher    at java.net.URLClassLoader$1.run(Unknown Source)    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.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2130)    ... 7 more

<?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.microsoft.sqlserver.jdbc.SQLServerDriver</property>        <property name="connection.url">jdbc:sqlserver://10.97.144.117:1433;DatabaseName=MY_FIRST_DB</property>        <property name="connection.username">JDBC</property>        <property name="connection.password">123456</property>                <property name="connection.pool_size">1</property>        <!-- SQL dialect -->        <property name="dialect">org.hibernate.dialect.SQLServer2008Dialect</property>        <!-- Echo all executed SQL to stdout -->        <property name="show_sql">true</property>                <property name="hibernate.format_sql">true</property>        <!-- Drop and re-create the database schema on startup -->        <property name="hbm2ddl.auto">update</property>        <mapping resource="cn/lcc/hibernate/model/User.hbm.xml"/> <!-- 注释掉原来的配置文件的映射方式-->                <!-- 这儿我使用Annotatinon的方式进行数据库表的映射 -->        <mapping class="cn.lcc.hibernaet.model.MyTeacher" />     </session-factory></hibernate-configuration>