有时候在变异一些类的时候出现类似It is indirectly referenced from required .class file的错误。
查询的原因可能是如下：
在spring2.0 技术手册的第4章第二节 关于Advice的实例BeforeAdviceDemo中
您会发现您书写的LogBeforeAdvice类中并未找到需继承的MethodBeforeAdvice接口，无法导入，原因为书上并未提及需要增加aop的jar包，您需要在工程/Propertise中的Java Build Path中的libraries 选项卡中添加spring-aop.jar，与下载包的路径是spring-framework-2.0.3-with-dependencies/spring-framework-2.0.3/dist/modules
添加之后，eclipse又会报出It is indirectly referenced from required .class file 的错误，其原因为Advice接口需要依赖于关于AOP标准的类，且其类并不在spring-aop.jar中，您需要再次添加依赖的包aopalliance.jar，于下载包的路径为spring-framework-2.0.3-with-dependencies/spring-framework-2.0.3/lib/aopalliance
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