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Concept questionMedium~7 min

How does graceful shutdown work in Spring Boot, and what can still go wrong?

Coordinates readiness, server draining, lifecycle timeouts, background work, and platform termination during a Spring Boot shutdown.

JavaSpring Boot

Concept questionMedium~7 min

How do Micrometer Observation, metrics, and traces fit together?

Explains one observation lifecycle feeding metrics, tracing, and context through registered handlers.

JavaSpring Boot

Practice drill

Concept questionMedium~7 min

How do Spring's cache annotations work, and what does proxying change?

Explains cache interception, keys, conditions, eviction, proxy self-invocation, and the provider boundary.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you choose metric names and tags without causing a cardinality problem?

Builds stable Micrometer dimensions that answer operational questions without unbounded time series and cost.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you preserve trace context across HTTP calls and asynchronous work in Spring?

Propagates trace and observation context through supported clients and executor boundaries without passing framework state manually.

JavaSpring Boot

Concept questionMedium~7 min

How should liveness, readiness, and health groups work in Spring Boot?

Separates restart-worthy process failure from traffic readiness and composes Spring Boot health groups around those meanings.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you add timeouts, retries, circuit breaking, and bulkheads to a Spring HTTP client?

Builds outbound resilience from deadlines and operation safety, then adds bounded retry, circuit, and concurrency controls with telemetry.

JavaSpring Boot

Architecture scenarioMedium~7 min

How would you design structured logging and correlation in a Spring Boot service?

Creates queryable structured events with trace correlation, stable fields, useful context, and deliberate redaction.

JavaSpring Boot

Debugging scenarioHard~10 min

How would you diagnose a slow Spring Boot endpoint in production?

Moves from user-visible latency to route, dependency, database, executor, JVM, and change evidence before selecting a fix.

JavaSpring Boot

Debugging scenarioHard~10 min

How would you diagnose HikariCP connection pool exhaustion?

Uses Hikari metrics, thread evidence, database activity, transaction scope, and query behavior to separate leaks from slow or excessive work.

JavaSpring Boot

Debugging scenarioHard~10 min

How would you diagnose request-thread or TaskExecutor saturation in Spring Boot?

Separates server request capacity from application executor capacity and finds blocking, queueing, rejection, or downstream causes.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you handle invalidation, stampedes, and TTLs in a Spring cache?

Keeps cached reads acceptably fresh and prevents hot-key reloads from overwhelming the database across application instances.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you make Spring Boot startup safe during a rolling deployment?

Coordinates startup work, readiness, schema compatibility, warmup, and mixed-version traffic during a rolling release.

JavaSpring Boot

Architecture scenarioMedium~7 min

How would you manage and validate configuration in a Spring Boot service?

Binds typed configuration, understands property precedence, validates startup invariants, and keeps secrets outside source control.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you review a Spring Boot service for production readiness?

Reviews correctness, boundaries, failure behavior, capacity, security, observability, delivery, and recovery through concrete evidence.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you size a HikariCP connection pool for a Spring Boot service?

Sizes per-instance database concurrency from workload and database capacity instead of equating more connections with more throughput.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you use Actuator diagnostic endpoints during an incident without creating a security risk?

Uses thread dumps, heap dumps, logger changes, mappings, and configuration evidence through a tightly controlled operator path.

JavaSpring Boot

Architecture scenarioMedium~7 min

How would you use Spring Boot Actuator safely in production?

Uses Actuator for operational visibility while controlling endpoint exposure, access, detail, and network reachability.

JavaSpring Boot

Architecture scenarioHard~10 min

What happens to @Scheduled jobs when a Spring Boot service has multiple replicas?

Designs scheduled work for overlap, multiple replicas, restart, failure, and durable ownership instead of assuming one execution.

JavaSpring Boot

Comparison questionHard~10 min

What is the difference between @TransactionalEventListener and a transactional outbox?

Separates transaction-phase callbacks inside one process from durable database-backed publication across process failure.

JavaSpring Boot

Architecture scenarioHard~10 min

What observability baseline would you expect for a production Spring Boot API?

Combines Spring Boot signals into an operator-focused baseline for service health, dependencies, capacity, releases, and actionable alerts.

JavaSpring Boot

Concept questionHard~10 min

What should you consider before using @Async in Spring?

Treats @Async as an in-process executor boundary with proxy, failure, context, capacity, and durability consequences.

JavaSpring Boot

Comparison questionMedium~7 min

When would you use Spring application events instead of durable messaging?

Separates in-process decoupling from durable cross-process delivery and makes timing, failure, and transaction expectations explicit.

JavaSpring Boot

Architecture scenarioHard~10 min

When would you write a custom HealthIndicator for a Spring Boot service?

Adds dependency health only when it supports a specific operational decision and can be checked cheaply and safely.

JavaSpring Boot