(This book is a classic of J2EE lightweight development! It is necessary to read it carefully! Its author Rod Johnson has 10 years of experience in writing Java programs, and is now a member of two JSR expert groups, Servlet and JDO2.0; for example, Spring, Hibernate, WebWork, etc. introduced in the book are all popular open source structures, and IoC, AOP and the like are popular concepts and vocabulary. And the biggest highlight is on the cover of this book: "withoutEJB". We have seen in countless books and articles that EJB is one of the core technologies of J2EE; and RodJohnson's book actually claims that most J2EE uses basically do not need EJB. This almost provocative posture makes it difficult for any responsible J2EE architect not to have a final idea - whether you plan to agree with him or plan to refute him.
John.Wiley.and.Sons.Expert.One.on.one.J2EE.Development.Without.EJB.eBook-LiB.pdf)