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Java Spring Boot Microservices & System Design — Topic-Wise Mock Tests
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All Modules & Topics in Java Spring Boot Microservices & System Design
Spring IoC Container, Bean Scopes & Proxy Internals
Purpose: To understand and apply Spring IoC Container, Bean Scopes & Proxy Internals in real Java Spring Boot Microservices & System Design systems — specifically: How JDK dynamic proxies and CGLIB power @Transactional and @Async, so your code stays reliable, fast, and easy to maintain in production.
Records, Sealed Interfaces & Pattern Matching for Switch
Purpose: To understand and apply Records, Sealed Interfaces & Pattern Matching for Switch in real Java Spring Boot Microservices & System Design systems — specifically: Model immutable domain DTOs and exhaustive payment/order states in modern Java 21, so your code stays reliable, fast, and easy to maintain in production.
Collections Internals, Bounded Generics & Custom Comparators
Purpose: To understand and apply Collections Internals, Bounded Generics & Custom Comparators in real Java Spring Boot Microservices & System Design systems — specifically: Choose optimal data structures (HashMap, TreeMap, ArrayDeque) for low-latency services, so your code stays reliable, fast, and easy to maintain in production.
Functional Interfaces, Stream Collectors & BigDecimal Monetary Math
Purpose: To understand and apply Functional Interfaces, Stream Collectors & BigDecimal Monetary Math in real Java Spring Boot Microservices & System Design systems — specifically: Transform complex datasets declaratively and compute exact financial balances, so your code stays reliable, fast, and easy to maintain in production.
Domain Exception Hierarchies, NIO.2 File Streams & Clean SOLID Boundaries
Purpose: To understand and apply Domain Exception Hierarchies, NIO.2 File Streams & Clean SOLID Boundaries in real Java Spring Boot Microservices & System Design systems — specifically: Handle recoverable vs fatal business errors and process large files safely in Java, so your code stays reliable, fast, and easy to maintain in production.
JVM Heap Generations, Metaspace, G1GC/ZGC & Heap Dump Forensics
Purpose: To understand and apply JVM Heap Generations, Metaspace, G1GC/ZGC & Heap Dump Forensics in real Java Spring Boot Microservices & System Design systems — specifically: Diagnose OutOfMemoryError spikes and tune GC pause times for SLA-critical APIs, so your code stays reliable, fast, and easy to maintain in production.
Java Memory Model, Locks, Atomic Operations & ConcurrentHashMap
Purpose: To understand and apply Java Memory Model, Locks, Atomic Operations & ConcurrentHashMap in real Java Spring Boot Microservices & System Design systems — specifically: Write thread-safe shared state without race conditions or lock contention, so your code stays reliable, fast, and easy to maintain in production.
CompletableFuture Pipelines, ExecutorPools & Structured Concurrency
Purpose: To understand and apply CompletableFuture Pipelines, ExecutorPools & Structured Concurrency in real Java Spring Boot Microservices & System Design systems — specifically: Fan out parallel microservice calls with strict timeouts and error fallbacks, so your code stays reliable, fast, and easy to maintain in production.
JMH Microbenchmarking, Lock-Free Queues & Thread-Pinning Diagnostics
Purpose: To understand and apply JMH Microbenchmarking, Lock-Free Queues & Thread-Pinning Diagnostics in real Java Spring Boot Microservices & System Design systems — specifically: Measure real JVM throughput scientifically and prevent virtual-thread pinning, so your code stays reliable, fast, and easy to maintain in production.
Spring IoC Container, Constructor Injection, Profiles & @ConfigurationProperties
Purpose: To understand and apply Spring IoC Container, Constructor Injection, Profiles & @ConfigurationProperties in real Java Spring Boot Microservices & System Design systems — specifically: Wire clean, testable Spring Boot 3 services with strongly typed externalized config, so your code stays reliable, fast, and easy to maintain in production.
RESTful Resource Design, Jakarta Bean Validation & RFC 9457 ProblemDetail
Purpose: To understand and apply RESTful Resource Design, Jakarta Bean Validation & RFC 9457 ProblemDetail in real Java Spring Boot Microservices & System Design systems — specifically: Expose clean, self-documenting REST APIs with consistent validation error contracts, so your code stays reliable, fast, and easy to maintain in production.
Spring AOP Cross-Cutting Auditing, Actuator Health Probes & Graceful Shutdown
Purpose: To understand and apply Spring AOP Cross-Cutting Auditing, Actuator Health Probes & Graceful Shutdown in real Java Spring Boot Microservices & System Design systems — specifically: Add non-invasive audit logging and Kubernetes-ready lifecycle hooks, so your code stays reliable, fast, and easy to maintain in production.
Hibernate Persistence Context, Dirty Checking & Entity Lifecycle States
Purpose: To understand and apply Hibernate Persistence Context, Dirty Checking & Entity Lifecycle States in real Java Spring Boot Microservices & System Design systems — specifically: Master Transient, Managed, Detached, and Removed states so Hibernate never surprises you, so your code stays reliable, fast, and easy to maintain in production.
Solving N+1 Select Storms: @EntityGraph, JOIN FETCH & DTO Projections
Purpose: To understand and apply Solving N+1 Select Storms: @EntityGraph, JOIN FETCH & DTO Projections in real Java Spring Boot Microservices & System Design systems — specifically: Reduce 201 SQL queries per API call down to 1–2 indexed queries, so your code stays reliable, fast, and easy to maintain in production.
Optimistic (@Version) vs Pessimistic Locking & JDBC Batch Inserts
Purpose: To understand and apply Optimistic (@Version) vs Pessimistic Locking & JDBC Batch Inserts in real Java Spring Boot Microservices & System Design systems — specifically: Prevent double-spending wallet balances and bulk-insert thousands of rows rapidly, so your code stays reliable, fast, and easy to maintain in production.
MVCC Internals, Transaction Isolation Levels & Deadlock Resolution
Purpose: To understand and apply MVCC Internals, Transaction Isolation Levels & Deadlock Resolution in real Java Spring Boot Microservices & System Design systems — specifically: Choose Read Committed vs Repeatable Read vs Serializable for financial correctness, so your code stays reliable, fast, and easy to maintain in production.
B-Tree, GIN, Partial Indexes & EXPLAIN (ANALYZE, BUFFERS) Tuning
Purpose: To understand and apply B-Tree, GIN, Partial Indexes & EXPLAIN (ANALYZE, BUFFERS) Tuning in real Java Spring Boot Microservices & System Design systems — specifically: Read PostgreSQL query execution plans and optimize multi-million-row tables, so your code stays reliable, fast, and easy to maintain in production.
Versioned Flyway Migrations & Expand-Contract Zero-Downtime Rollouts
Purpose: To understand and apply Versioned Flyway Migrations & Expand-Contract Zero-Downtime Rollouts in real Java Spring Boot Microservices & System Design systems — specifically: Evolve live production schemas while old and new microservice pods run side-by-side, so your code stays reliable, fast, and easy to maintain in production.
Spring Security 6 FilterChain Architecture & Password Hashing
Purpose: To understand and apply Spring Security 6 FilterChain Architecture & Password Hashing in real Java Spring Boot Microservices & System Design systems — specifically: Configure modern lambda DSL security filter chains with zero deprecated WebSecurityConfigurerAdapter code, so your code stays reliable, fast, and easy to maintain in production.
OAuth2 Resource Servers, RSA/JWKS JWT Verification & Token Rotation
Purpose: To understand and apply OAuth2 Resource Servers, RSA/JWKS JWT Verification & Token Rotation in real Java Spring Boot Microservices & System Design systems — specifically: Validate asymmetric JWTs across 15+ microservices without hitting a central DB per request, so your code stays reliable, fast, and easy to maintain in production.
Fine-Grained @PreAuthorize Method Security & Service-to-Service Auth
Purpose: To understand and apply Fine-Grained @PreAuthorize Method Security & Service-to-Service Auth in real Java Spring Boot Microservices & System Design systems — specifically: Enforce role/ownership permissions and mTLS/client-credentials between internal services, so your code stays reliable, fast, and easy to maintain in production.
Domain-Driven Bounded Contexts & Database-Per-Service Decomposition
Purpose: To understand and apply Domain-Driven Bounded Contexts & Database-Per-Service Decomposition in real Java Spring Boot Microservices & System Design systems — specifically: Split monoliths along true business capabilities instead of creating a distributed monolith, so your code stays reliable, fast, and easy to maintain in production.
Spring Cloud Gateway: Reactive Routing, Redis Rate Limiting & Auth Offload
Purpose: To understand and apply Spring Cloud Gateway: Reactive Routing, Redis Rate Limiting & Auth Offload in real Java Spring Boot Microservices & System Design systems — specifically: Centralize TLS, JWT verification, and per-tenant throttling at the API edge, so your code stays reliable, fast, and easy to maintain in production.
Declarative HTTP Clients (@HttpExchange), gRPC & Timeout Budgets
Purpose: To understand and apply Declarative HTTP Clients (@HttpExchange), gRPC & Timeout Budgets in real Java Spring Boot Microservices & System Design systems — specifically: Communicate synchronously between services safely with strict connect/read deadlines, so your code stays reliable, fast, and easy to maintain in production.
Circuit Breakers, Bulkhead Isolation & Exponential Jitter Retries
Purpose: To understand and apply Circuit Breakers, Bulkhead Isolation & Exponential Jitter Retries in real Java Spring Boot Microservices & System Design systems — specifically: Prevent one degraded downstream gateway from cascading across your entire microservice fleet, so your code stays reliable, fast, and easy to maintain in production.
Multi-Tier Caching (Caffeine L1 + Redis L2) & Graceful Degradation
Purpose: To understand and apply Multi-Tier Caching (Caffeine L1 + Redis L2) & Graceful Degradation in real Java Spring Boot Microservices & System Design systems — specifically: Serve catalog and FX-rate reads from memory even during partial database maintenance, so your code stays reliable, fast, and easy to maintain in production.
Distributed Idempotency, ShedLock Scheduled Jobs & Chaos Fault Injection
Purpose: To understand and apply Distributed Idempotency, ShedLock Scheduled Jobs & Chaos Fault Injection in real Java Spring Boot Microservices & System Design systems — specifically: Ensure scheduled settlements and retried requests execute safely across N replicas, so your code stays reliable, fast, and easy to maintain in production.
Kafka Partitions, Consumer Groups, Acks=all & Schema Registry
Purpose: To understand and apply Kafka Partitions, Consumer Groups, Acks=all & Schema Registry in real Java Spring Boot Microservices & System Design systems — specifically: Stream millions of ordered domain events reliably between decoupled Spring Boot services, so your code stays reliable, fast, and easy to maintain in production.
Transactional Outbox Pattern, Debezium CDC & Idempotent Consumers
Purpose: To understand and apply Transactional Outbox Pattern, Debezium CDC & Idempotent Consumers in real Java Spring Boot Microservices & System Design systems — specifically: Eliminate dual-write bugs between PostgreSQL commits and Kafka publishes, so your code stays reliable, fast, and easy to maintain in production.
Distributed Sagas: Choreography vs Orchestration & Compensating Actions
Purpose: To understand and apply Distributed Sagas: Choreography vs Orchestration & Compensating Actions in real Java Spring Boot Microservices & System Design systems — specifically: Maintain cross-service data consistency without brittle two-phase XA distributed locks, so your code stays reliable, fast, and easy to maintain in production.
Distributed Tracing with OpenTelemetry across HTTP & Kafka Hops
Purpose: To understand and apply Distributed Tracing with OpenTelemetry across HTTP & Kafka Hops in real Java Spring Boot Microservices & System Design systems — specifically: Follow a single slow request across Gateway -> Order -> Kafka -> Payment in one trace flamegraph, so your code stays reliable, fast, and easy to maintain in production.
Micrometer Dimensional Metrics, Prometheus Histograms & Alerting SLOs
Purpose: To understand and apply Micrometer Dimensional Metrics, Prometheus Histograms & Alerting SLOs in real Java Spring Boot Microservices & System Design systems — specifically: Measure latency percentiles (p50/p95/p99), error rates, and JVM saturation accurately, so your code stays reliable, fast, and easy to maintain in production.
Structured JSON Log Aggregation (Loki/ELK) & Incident Runbooks
Purpose: To understand and apply Structured JSON Log Aggregation (Loki/ELK) & Incident Runbooks in real Java Spring Boot Microservices & System Design systems — specifically: Query terabytes of multi-pod logs by traceId and tenantId in seconds, so your code stays reliable, fast, and easy to maintain in production.
JUnit 5, Mockito, @WebMvcTest Slices & Testcontainers Real DB/Kafka Suites
Purpose: To understand and apply JUnit 5, Mockito, @WebMvcTest Slices & Testcontainers Real DB/Kafka Suites in real Java Spring Boot Microservices & System Design systems — specifically: Test Spring Boot microservices against real PostgreSQL, Redis, and Kafka containers in CI, so your code stays reliable, fast, and easy to maintain in production.
Spring Boot Layered JARS, Distroless Containers & JVM Container Ergonomics
Purpose: To understand and apply Spring Boot Layered JARS, Distroless Containers & JVM Container Ergonomics in real Java Spring Boot Microservices & System Design systems — specifically: Build fast-booting, security-hardened container images tailored for cloud orchestration, so your code stays reliable, fast, and easy to maintain in production.
Kubernetes Deployments, HPA Autoscaling, Secrets & Zero-Downtime Rollouts
Purpose: To understand and apply Kubernetes Deployments, HPA Autoscaling, Secrets & Zero-Downtime Rollouts in real Java Spring Boot Microservices & System Design systems — specifically: Deploy resilient Spring Boot microservice fleets onto Kubernetes clusters, so your code stays reliable, fast, and easy to maintain in production.
Transactional Outbox Pattern with Spring Data JPA & Debezium/Polling Relay
Purpose: To understand and apply Transactional Outbox Pattern with Spring Data JPA & Debezium/Polling Relay in real Java Spring Boot Microservices & System Design systems — specifically: Eliminate dual-write inconsistencies between PostgreSQL commits and Apache Kafka event publishing, so your code stays reliable, fast, and easy to maintain in production.
Idempotent Kafka Consumers, Dead-Letter Topics & Poison-Pill Recovery
Purpose: To understand and apply Idempotent Kafka Consumers, Dead-Letter Topics & Poison-Pill Recovery in real Java Spring Boot Microservices & System Design systems — specifically: Process duplicate payment or order messages safely without corrupting downstream microservice ledgers, so your code stays reliable, fast, and easy to maintain in production.
Optimistic/Pessimistic JPA Locking & Redis Distributed Mutexes
Purpose: To understand and apply Optimistic/Pessimistic JPA Locking & Redis Distributed Mutexes in real Java Spring Boot Microservices & System Design systems — specifically: Prevent race conditions and lost updates when concurrent threads modify shared account balances, so your code stays reliable, fast, and easy to maintain in production.
JDK Flight Recorder (JFR), Heap Dump Analysis & GC Pause Tuning in Java 21
Purpose: To understand and apply JDK Flight Recorder (JFR), Heap Dump Analysis & GC Pause Tuning in Java 21 in real Java Spring Boot Microservices & System Design systems — specifically: Diagnose memory leaks, thread contention, and tail-latency spikes in high-throughput Spring Boot services, so your code stays reliable, fast, and easy to maintain in production.
Graceful Kubernetes Shutdown, Readiness/Liveness Probes & Testcontainers CI
Purpose: To understand and apply Graceful Kubernetes Shutdown, Readiness/Liveness Probes & Testcontainers CI in real Java Spring Boot Microservices & System Design systems — specifically: Run real PostgreSQL + Kafka integration suites in CI and deploy zero-downtime microservice releases, so your code stays reliable, fast, and easy to maintain in production.
Enterprise Java Microservices System Design & Failure-Mode Walkthroughs
Purpose: To understand and apply Enterprise Java Microservices System Design & Failure-Mode Walkthroughs in real Java Spring Boot Microservices & System Design systems — specifically: Articulate CAP theorem, Saga vs 2PC, and backpressure trade-offs clearly in senior Java interviews, so your code stays reliable, fast, and easy to maintain in production.