Proxy means to use DelegatingActionProxy in struts-config.xml, and let Spring to manage all the beans.

No RequestProccessor configuration, AOP supportted, and all beans are under controller of Spring container.

An new Spring configration xml for Struts action introduced, and you must maintain this file by hand. Struts configuration also changed to adopt this style, and not tool supportted, a lot of work should be done by hand.