在Eclipse中声明package级别的注解时会显示错误，解决方法如下：
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1.在对应的package(如:com.sin90.hibernate.beans)内新建一个名为package-info.java文件
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2.在package-info.java内添加注解:
@org.hibernate.annotations.GenericGenerator(name = "g_id", strategy = "uuid")package com.sin90.hibernate.beans;
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that's all!