Publication of "Expert One-on-One J2EE Design and Development"

Rod Johnson's influential book introduced the core principles of Inversion of Control (IoC) and Dependency Injection (DI) as a practical alternative to EJB's complexity, providing the initial codebase that would evolve into the Spring Framework.

Significance

This book served as the intellectual birthplace of Spring, proving the viability of a lightweight, POJO-centric approach to enterprise Java development and galvanizing a community of developers frustrated with existing solutions.