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Spring Portlet MVC和其Web MVC可以说是如出一辙,只是在Web MVC中处于核心的DispatcherServlet在Portlet MVC中换成了DispatcherPortlet

spring-instrument-tomcat-4.3.14.RELEASE.jar For many application servers, Spring provides a LoadTimeWeaver implementation that can take advantage of the instrumentable ClassLoader that the server provides. Tomcat's WebappClassLoader is currently not instrumentable, so Spring provides a custom ClassLoader that can be used by placing spring-instrument-tomcat.jar in $TOMCAT_HOME/lib and putting a loader declaration in META-INF/context.xml.

Commons Logging (JCL)提供的是一个日志(Log)接口(interface)，同时兼顾轻量级和不依赖于具体的日志实现工具。它提供给中间件/日志工具开发者一个简单的日志操作抽象，允许程序开发人员使用不同的具体日志实现工具 commons-logging 版本号：1.1.3 最新版