Spring REST Validation at Request Boundaries
Validate Spring Boot request bodies and parameters with @Valid and Jakarta constraints, return clear 400 errors, and avoid silent gaps.
~6 min readread →
Developer interview notes & guides — Page 31
Focused explanations and longer guides, with worked scenarios, common mistakes and interview exercises across every chapter.
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Showing 721–744 of 825 articles
Spring Transaction Rollback Rules and Exceptions
Why Spring @Transactional commits on checked exceptions, how rollbackFor and noRollbackFor work, and why swallowed exceptions commit.
~6 min readread →
Spring Security Filter Chains and Endpoint Policy
How Spring Security 6 SecurityFilterChain beans work: lambda DSL, securityMatcher, @Order, rule ordering and why the first matching chain wins.
~6 min readread →
Spring Startup Checks and Readiness
How Spring Boot liveness and readiness probes work on Kubernetes, what belongs in each health group, and how to warm up and shut down gracefully.
~6 min readread →
Spring Transaction Duration and Remote Calls
Why long @Transactional methods exhaust the Hikari pool and hold locks, and how to keep remote calls, files and email outside the transaction.
~7 min readread →
Spring Transactions and Proxy Invocation
Why @Transactional is ignored on self-invocation and private methods in Spring Boot, how the proxy works, and four ways to fix it.
~7 min readread →
SQL Aggregation and Result Grain
SQL Aggregation and Result Grain. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
PostgreSQL Composite Indexes and Query Patterns
PostgreSQL Composite Indexes and Query Patterns. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Constraints as Concurrent Safety Nets
SQL Constraints as Concurrent Safety Nets. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Count Star Versus Count Column
SQL Count Star Versus Count Column. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Common Table Expressions and Query Structure
SQL Common Table Expressions and Query Structure. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Exists for Relationship Checks
SQL Exists for Relationship Checks. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
PostgreSQL Explain Analyze and Real Execution
PostgreSQL Explain Analyze and Real Execution. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Joins and Unexpected Row Multiplication
SQL Joins and Unexpected Row Multiplication. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Keyset Pagination and Stable Ordering
SQL Keyset Pagination and Stable Ordering. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Left Joins and Filter Placement
SQL Left Joins and Filter Placement. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
PostgreSQL MVCC, Old Versions and Vacuum
PostgreSQL MVCC, Old Versions and Vacuum. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Normalization and Deliberate Denormalization
SQL Normalization and Deliberate Denormalization. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Null and Three-Valued Logic
SQL Null and Three-Valued Logic. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
PostgreSQL Partial Indexes for Focused Workloads
PostgreSQL Partial Indexes for Focused Workloads. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Parameterization and Injection Prevention
SQL Parameterization and Injection Prevention. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Row Number, Rank and Dense Rank
SQL Row Number, Rank and Dense Rank. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
PostgreSQL Row Locks and Concurrent Updates
PostgreSQL Row Locks and Concurrent Updates. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
SQL Transaction Isolation and Observable Anomalies
SQL Transaction Isolation and Observable Anomalies. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
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