Which Java Technologies Are Obsolete? Expert Advice on What to Skip

The author shares advice gathered from reader questions about which Java technologies are worth learning, focusing on those that have become outdated in modern backend development.

Practical relevance in real projects

Depth of understanding they provide

Value for job interviews

JSP

JSP was traditionally used as the view layer in MVC architectures, but most companies have moved to fully separated front‑end and back‑end development, rendering JSP largely unnecessary.

Recommendation: completely drop learning JSP.

Struts

Struts was once a popular MVC framework, yet Spring MVC now dominates the Java ecosystem, offering tighter integration with the Spring stack.

Recommendation: stop learning Struts and start with Spring MVC.

Hibernate

Hibernate provides powerful ORM capabilities but comes with high learning cost, complex configuration, and difficult performance tuning, especially for applications that need fine‑grained SQL control.

High learning curve

Complex configuration

Hard to optimize performance

For performance‑critical projects, MyBatis offers a lighter‑weight alternative that balances ORM convenience with direct SQL access.

Recommendation: stop learning Hibernate; learn MyBatis instead.

Servlet (must master)

Although pure Servlet‑based applications are rare today, Servlets remain the foundational layer beneath all Java web frameworks, including Spring MVC.

Understanding the Servlet lifecycle is essential for deep mastery of any MVC framework and enables advanced techniques such as request interception and response manipulation.

Recommendation: study Servlets thoroughly and understand them deeply.

Other Technologies

Additional Java technologies that are generally not worth investing time in for most developers:

Applet : obsolete browser plug‑in technology.

Swing : desktop UI framework largely replaced by C++/C# solutions in professional settings.

JDBC : low‑level database API; useful but can be deprioritized if time is limited.

XML : still used, but JSON has become the dominant data‑exchange format; basic familiarity is sufficient.

Conclusion

The suggestions above reflect the author’s personal experience and may be subjective, but they aim to help learners focus on the most relevant Java backend technologies today.