hibernate Unknown entity异常

This exception I find the Internet a lot, and later tested (attribute name of the bean hibernate modify the configuration file) found that the problem is not scanned into the spring xml file entity classes, if placed in resource folder, applicationContext.xml write

<property name="mappingDirectoryLocations" value="classpath:/" ></property> 

The best is the entity bean class and placed in a folder

    <property name="mappingDirectoryLocations" value="classpath:bean" ></property>