Which Java Technologies Are Truly Obsolete? A 2024 Guide for Developers

After receiving many questions about which Java technologies are still worth learning, the author shares his 20‑year perspective on the evolution of Java EE, web frameworks, IDEs, and advises readers to drop outdated knowledge.

Is the technology useful in real development?

Does it deepen understanding of core concepts?

Is it valuable for interview preparation?

JSP

JSP is mainly used as the View layer in traditional MVC, but most companies have moved to full front‑back separation using REST APIs, making JSP largely unnecessary.

"Completely drop JSP learning."

Struts

Although Struts was once a solid MVC framework, Spring MVC now dominates because it integrates perfectly with the Spring ecosystem.

"Stop learning Struts; start with Spring MVC!"

Hibernate

Hibernate is a powerful ORM, but its complexity, heavy configuration, and performance overhead make it costly to master, especially for performance‑critical applications.

High learning curve

Complex configuration

Difficult tuning

MyBatis offers a lightweight, hybrid approach that retains the benefits of ORM while allowing direct SQL access.

"No need to learn Hibernate; MyBatis is sufficient."

Servlet (must master)

Even though pure Servlets are rarely used to build whole web apps, they remain the foundation of all Java web containers and MVC frameworks like Spring MVC.

Understanding the Servlet lifecycle enables advanced techniques such as request interception, permission checks, and response manipulation.

"Servlet must be learned deeply and thoroughly."

Other Legacy Topics

1. Applet

Applet technology is obsolete and has been superseded by modern web standards.

2. Swing

Desktop UI development in Java now favors C++ (MFC) or C# (WinForms/WPF); Swing is rarely needed.

3. JDBC

JDBC underpins many frameworks (e.g., MyBatis). While not essential to master, a basic understanding is useful.

4. XML

XML is still used, but JSON is the preferred data‑exchange format for web services; deep XML API knowledge is optional.

Conclusion

The author’s recommendations reflect current industry trends in China, emphasizing Spring Boot + Vue microservice projects, Docker/K8s deployment, and the importance of mastering Servlets while discarding outdated Java technologies.

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