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56+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes authentication vs authorization, spring security filter chain, jwt structure and flow, stateless vs stateful auth, and more.
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Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Security is not optional, and interviewers test whether freshers understand the difference between authentication (who are you?) and authorisation (what can you do?). This module covers the Spring Security filter chain at a conceptual level, JWT structure (header.payload.signature) and the end-to-end login flow, why passwords are hashed with BCrypt and not encrypted, stateless vs stateful session management, and role-based access control with @PreAuthorize. You don't need to know the full SecurityFilterChain API by heart — you need to be able to explain the flow coherently and know where to look when it breaks.
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Topics are ordered for learning. Within each topic, rows are numbered 1–56 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–56 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q56.