我在Eclipse中添加了一个spring项目。当我从eclipse在服务器上运行项目时，我收到了这些错误：
Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/myprojectwebsite-servlet.xml]: Invocation of init method failed; nested exception is org.hibernate.MappingException: Unable to load class declared as <mapping class="com.test.myproject.data.User"/> in the configuration:
Caused by: org.hibernate.MappingException: Unable to load class declared as <mapping class="com.test.myproject.data.User"/> in the configuration:
myprojectwebsite-servlet.xml有：
...
<property name="configLocation">
<value>classpath:hibernate.cfg.xml</value>
</property>
...
和hibernate.cfg.xml包含引发错误的代码：
<mapping class="com.test.myproject.data.User"/>
知道可能出现什么问题吗？