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Aporeon

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24 results across 1 active filter

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Concept questionHard~10 min

How do content negotiation and message converters work in Spring MVC?

Connects Content-Type and Accept to handler conditions and converter selection for request reading and response writing.

JavaSpring Boot

Concept questionMedium~7 min

How does a request flow through Spring MVC and DispatcherServlet?

Traces a Servlet request through filters, DispatcherServlet, handler mapping, argument resolution, controller invocation, return handling, conversion, and exception resolution.

JavaSpring Boot

Practice drill

Concept questionHard~10 min

How does asynchronous request processing work in Spring MVC?

Explains Servlet async dispatch, Callable, DeferredResult, executor ownership, timeout, context, and the difference from WebFlux.

JavaSpring Boot

Concept questionHard~10 min

How does Jackson JSON binding work in Spring MVC, and what can go wrong?

Explains message-converter selection, deserialization, Java records and constructors, unknown fields, dates, enums, and stable JSON configuration.

JavaSpring Boot

Concept questionHard~10 min

How does method validation work for Spring MVC controller parameters?

Explains direct parameter constraints, object cascades, built-in MVC validation, error aggregation, and stable response handling.

JavaSpring Boot

Concept questionMedium~7 min

How does Spring MVC choose which controller method handles a request?

Explains path, HTTP method, parameters, headers, consumed and produced media types, specificity, and ambiguous mappings.

JavaSpring Boot

Concept questionMedium~7 min

How do you bind path, query, header, and body values in Spring MVC?

Maps each part of the HTTP request to explicit controller arguments and distinguishes conversion, model binding, and body conversion.

JavaSpring Boot

Debugging scenarioHard~10 min

How do you configure and debug CORS in Spring MVC?

Configures finite origins, methods, headers, credentials, and preflight behavior while separating browser enforcement from authorization.

JavaSpring Boot

Debugging scenarioHard~10 min

How do you diagnose a request rejected before a Spring controller runs?

Classifies mapping, conversion, binding, validation, multipart, CORS, filter, and negotiation failures before changing controller code.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you evolve and version a Spring MVC API?

Prefers compatible evolution, uses Spring version resolution when a breaking contract requires it, and operates deprecation deliberately.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you expose pagination, filtering, and sorting safely in a Spring API?

Maps a bounded public list contract to Spring arguments without exposing persistence property names or unstable ordering.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you implement global API error handling with @ControllerAdvice and ProblemDetail?

Maps known framework and application failures to RFC 9457 responses while preserving stable codes, safe detail, and correlation.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you map domain failures to HTTP responses in a Spring API?

Keeps domain outcomes transport-neutral and maps not-found, conflict, invalid transition, and dependency failure at the web boundary.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you stream a large response from Spring MVC safely?

Chooses Resource, StreamingResponseBody, emitters, or SSE while controlling memory, timeout, disconnect, headers, and late failure.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you validate multipart file uploads in Spring MVC?

Combines multipart limits, metadata validation, content inspection, safe storage, and asynchronous malware processing.

JavaSpring Boot

Architecture scenarioHard~10 min

How do you validate nested objects and cross-field rules in Spring?

Uses cascaded validation for nested DTOs, class-level constraints for local invariants, and domain services for state-dependent rules.

JavaSpring Boot

Architecture scenarioHard~10 min

How would you implement an idempotent POST endpoint in Spring?

Places an idempotency key at the Spring boundary while persisting request identity and terminal outcome atomically with business work.

JavaSpring Boot

Comparison questionEasy~5 min

What is the difference between @Controller and @RestController?

Separates view-oriented controller return handling from class-level response-body semantics without implying different request mapping.

JavaSpring Boot

Comparison questionHard~10 min

What is the difference between @Valid and @Validated in Spring MVC?

Separates Jakarta cascaded validation, Spring validation groups, and modern MVC method validation without relying on outdated controller advice.

JavaSpring Boot

Comparison questionHard~10 min

When do you choose Spring MVC versus Spring WebFlux?

Chooses between blocking Servlet execution and end-to-end non-blocking reactive execution based on dependencies, concurrency, and team cost.

JavaSpring Boot

Comparison questionMedium~7 min

When do you return ResponseEntity instead of a body directly?

Uses direct bodies for fixed successful contracts and ResponseEntity when status or headers vary by outcome.

JavaSpring Boot

Comparison questionHard~10 min

When do you use a Servlet filter, HandlerInterceptor, or ControllerAdvice?

Places protocol-wide work in filters, handler-aware MVC work in interceptors, and controller exception or body concerns in advice.

JavaSpring Boot

Comparison questionHard~10 min

When do you use RestClient, WebClient, or an HTTP Service interface in Spring?

Chooses synchronous, reactive, or declarative clients based on the application's execution model while keeping shared timeout and error policy explicit.

JavaSpring Boot

Architecture scenarioMedium~7 min

Why use request and response DTOs in a Spring API?

Keeps JSON binding, validation, writable fields, and response evolution separate from domain and persistence models.

JavaSpring Boot