解决方法：
class路径没写正确。
有三个地方需要注意
1、<hibernate-mapping package="">
2、<class name="com.model.RoleInfo">
3、<set name="userInfos" table="ROLEOFUSER" inverse="false">
<key column="ROLEID">
</key>
<many-to-many column="USERID" class="com.model.UserInfo" />
</set>
建议：最好写在第一个地方，这样下面就可以不用写很长的包名了
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