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Evaluate your expertise in Spring Boot 3+, GraalVM AOT compilation, Spring Cloud, and reactive microservices. Beantworte jede Frage und sieh sofort, ob du richtig liegst — jedes Mal mit Erklärung.
Ein kostenloser Multiple-Choice-Übungstest mit 16 Fragen zu IT. Jede Frage hat eine richtige Antwort und eine kurze Erklärung, und der vollständige Lösungsschlüssel unter dem Quiz dient zugleich als Lernzettel. Kein Konto, kein Zeitlimit — löse ihn so oft du willst.
Dies ist ein kostenloses Multiple-Choice-Quiz mit 16 Fragen. Nach jeder Antwort siehst du, ob sie richtig war — immer mit Erklärung. Keine Anmeldung, kein Zeitlimit: Mach es so oft du willst und nutze den Lösungsschlüssel oben zum Wiederholen, vorher oder nachher.
Richtige Antwort: AAdoption of Java 17 and migration to Jakarta EE 9/10 namespaces
Spring Boot 3 raised the minimum runtime baseline to Java 17 and migrated all internal package dependencies from javax.* to jakarta.*.
Richtige Antwort: BIt evaluates configuration and registers reflection/proxy hints during the build phase
Spring AOT inspects the application at build time to evaluate conditional configurations, generating bytecode and reachability metadata (reflection, proxies) needed by GraalVM native-image.
Richtige Antwort: BRuntimeHintsRegistrar
Implementing RuntimeHintsRegistrar allows developers to register reflection, resource, serialization, and proxy hints directly with Spring's AOT engine.
Richtige Antwort: BIt creates a single unified abstraction to record metrics, traces, and logs simultaneously
The Micrometer Observation API provides a single instrumented API that captures both metrics (timers, counters) and distributed traces (spans) without dual instrumentation.
Richtige Antwort: Bspring.threads.virtual.enabled=true
Setting 'spring.threads.virtual.enabled=true' instructs Spring Boot to configure the embedded Tomcat web server and task executors to dispatch requests using virtual threads.
Richtige Antwort: BIt is built into core Spring Web, using annotations like @HttpExchange backed by WebClient or RestClient
Spring 6 introduced native HTTP Interfaces (@HttpExchange) directly into core Spring, allowing interface-driven clients backed by WebClient or the new RestClient without OpenFeign.
Richtige Antwort: BIt automatically starts, manages, and injects dynamic connection properties for containerized dependencies
Spring Boot's Testcontainers support (via @ServiceConnection) starts Docker containers for databases or brokers and automatically maps their dynamic ports into Spring properties.
Richtige Antwort: BThe Netty event loop thread is blocked, severely degrading throughput for all concurrent users
Netty uses a small number of event loop threads; running blocking operations directly on an event loop blocks concurrent request processing, causing system-wide latency spikes.
Richtige Antwort: BIt prevents containers from shutting down across live-reload application restarts
@RestartScope ensures that Testcontainers instances remain running between DevTools application reloads, eliminating slow container restarts during local development.
Richtige Antwort: BSpring WebFlux running on an event-driven Netty runtime
Spring Cloud Gateway is built on Spring WebFlux, Project Reactor, and Netty, enabling high-performance, non-blocking asynchronous request routing.
Richtige Antwort: BIt decrypts encrypted configuration properties stored in Git before serving them to client microservices
Spring Cloud Config Server can store encrypted cipher values ({cipher}...) in version control and decrypt them on-the-fly using symmetric or asymmetric keys before sending them to authorized clients.
Richtige Antwort: AEliminating the N+1 select queries problem by specifying fetch plans eagerly
EntityGraphs provide fine-grained control over entity fetching at query time, overriding default lazy-loading to fetch related entities in a single join query and avoiding N+1 queries.
Richtige Antwort: BBy exposing only the /health endpoint over Web, hiding others unless explicitly enabled
For security, Spring Boot Actuator restricts default web exposure to only the /actuator/health endpoint; all other endpoints must be opted-in via management.endpoints.web.exposure.include.
Richtige Antwort: AJwtAuthenticationFilter with JwtDecoder
Spring Security OAuth2 Resource Server uses a configured JwtDecoder bean to verify digital signatures, timestamps, and claims before constructing an authenticated JwtAuthenticationToken.
Richtige Antwort: BTo reuse physical database connections and minimize expensive TCP and TLS handshakes
HikariCP maintains a ready pool of active database connections, eliminating the high latency of establishing fresh TCP, TLS, and database authentication sessions on every query.
Richtige Antwort: BResilience4j
Spring Cloud Circuit Breaker defaults to Resilience4j, providing a lightweight, functional programming model for circuit breakers, rate limiters, and bulkheads following Hystrix deprecation.