Code Review from a Java Junior Interview

Veröffentlicht am: 26 März 2026
auf dem Kanal: Павел Сорокин

5,685

200

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Well, today we'll be reviewing the 'PaymentController' code review, which is actually given during interviews.

It seems like nothing complicated: no algorithms, no theory rehearsals – you just look at the code and explain what's wrong and how to fix it. But, it's precisely these kinds of tasks that often defeat even those who've been answering questions flawlessly throughout the entire interview.

And that's because at this stage, they're not checking memorized annotations, but how you think and reason. That's why this video will be especially useful: it'll give you a little brain exercise and sharpen your engineering thinking.

So, what we'll cover here:
• Common mistakes in Spring Controller
• How to properly structure Controller → Service → Repository layers
• REST bugs (mapping, DTOs, parameters)
• Error handling and ExceptionHandler
• Idempotency, retries, and duplicate protection

At work, even at your dream company, you'll never see perfect code—more often than not, it's a "temporary solution" that's been in production for three years. Therefore, this video will only feature commands and approaches that are actually used in real life.

📌 My Telegram channel about Java and backend: https://t.me/S0R0KlN

00:00:00 — Introduction
00:01:02 — Interview Question Format
00:02:17 — Controller Code Analysis
00:04:13 — Architectural Mistakes
00:05:26 — REST and Method Names
00:07:39 — Analysis of the makePayment Method
00:10:59 — Anti-Patterns and Responsibilities
00:12:21 — Error Handling
00:17:03 — Filtering and Pagination
00:22:10 — Exceptions and Business Logic
00:28:12 — Logging
00:30:21 — Concurrent Requests and Locks
00:31:01 — Idempotency
00:32:49 — Conclusion

#java #springboot #backend #codereview #javadeveloper #interview

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