1，错误描述：
本来是在项目下建立一个lib，然后包含进来所有的包，，，结果出现了下面的错误，，，，，
严重:Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'movieSimilarityDAO' defined in ServletContext resource [/WEB-INF/classes/applicationContext.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/apache/mahout/cf/taste/impl/similarity/GenericItemSimilarity$ItemItemSimilarit
2，解决办法：
将mahout-core-0.5.jar直接包含在WebRoot/WEB-INF/lib/下，问题解决，，，，