Where is the difference between Struts Pojo and Struts Spring? If the unit test is tested, the former is also possible. Martin Fowler's article is more preferred in Service Locator mode, and he believes that IOC mode is not conducive to understanding. How much benefits have to be brought using Spring, what are the negative roles? Mr. Bridge in JDON seems to have questioned Spring. I don't think it should be trapped in the singularity of "People Yun Yun Yun", which is seen in two.