Lesson 01
Production Spring Boot Backend Systems Explained
Decision: separate production responsibilities while preserving one explainable order-service outcome across every boundary.
Spring Backend topic cluster
Spring Backend Engineering
Production Spring Boot engineering through HTTP, validation, errors, transactions, JPA, configuration, security, operations, testing, and incident recovery.
13 ordered lessons
Follow one order service from request to recovery.
Connect framework mechanisms to their HTTP, security, transaction, data, operations, testing, and incident evidence boundaries.
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Lesson 02
Spring Boot REST Controller Explained
Explains @RestController, request mappings, DTOs, validation, status codes, error handling, and controller tests.
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Lesson 03
Spring Boot Request Validation Explained
Decision: reject bounded request-shape defects early while leaving authorization and concurrent invariants to their owning boundaries.
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Lesson 04
Spring Boot Exception Handling Explained
Decision: publish safe RFC 9457 problems only from the boundary that can still control the response.
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Lesson 05
Spring Service Layers and Transaction Boundaries Explained
Decision: keep one local transaction short and explicit across proxy, rollback, thread, and remote-call boundaries.
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Lesson 06
Spring Data JPA Query Performance Explained
Decision: optimize measured SQL, plans, rows, pool wait, and user latency instead of applying global fetch folklore.
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Lesson 07
Spring Boot Configuration Properties, Profiles, and Secrets Explained
Decision: bind typed operating input, prove precedence safely, and keep profiles separate from secret delivery.
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Lesson 08
Spring Security Filter Chain and Authorization Explained
Decision: select explicit ordered chains, deny unknown access, and enforce tenant ownership from trusted state.
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Lesson 09
Spring Boot Actuator, Health, and Metrics Explained
Decision: expose minimal operational surfaces and separate liveness, readiness, diagnostics, and user outcomes.
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Lesson 10
Spring Boot Integration Testing with Testcontainers Explained
Decision: prove migrations, security, transactions, and concurrency against PostgreSQL without claiming production equivalence.
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Lesson 11
Production Spring Boot Incident Troubleshooting
Decision: move from evidence and reversible mitigation through user, correctness, and resource recovery verification.
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Lesson 12
Java Virtual Threads for Backend Services
Shared Java Concurrency lesson: enable Java 21 blocking-task scalability without overstating Spring context or downstream capacity.
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Lesson 13
Production Java Concurrency Troubleshooting
Shared operations lesson: connect Spring executors and virtual threads to JVM, resource, dependency, and user evidence.