Spring3集成JPA，在添加聲明式事務管理后，啟動TOMCAT，報錯：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator#0' defined in class path resource [spring/applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/aopalliance/intercept/MethodInterceptor
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Caused by: java.lang.NoClassDefFoundError: org/aopalliance/intercept/MethodInterceptor
解決辦法：
添加spring所信賴的包。如果你下載的版本沒有包含信賴的包，請下載前一個版本帶信賴的包，然后拷貝缺少的jar，加入你的classpath即可。