Java Microservices Fundamentals Quiz Quiz

Test your understanding of essential concepts, annotations, and patterns in Java microservices architecture with these easy, scenario-based questions.

1. Definition of Microservices

   Which statement best describes the microservices architecture in Java-based systems?

   1. Using only message brokers for service communication.
   2. Writing services only in the Java programming language.
   3. Building applications with tight coupling between modules.
   4. A design in which all parts of an application run in a single, large codebase.
   5. A style where an application is developed as a collection of small, independently deployable services.

2. Building Blocks

   In a typical Java microservices system, which component handles business rules and operations logic?

   1. Cache Provider
   2. Data Loader
   3. Service Layer
   4. Config Server
   5. Servlet Thread

3. Key Annotations

   Which annotation in Java is commonly used to mark a class as a RESTful web service controller?

   1. @DataController
   2. @ResourceControler
   3. @Serivce
   4. @RestController
   5. @WebResponser

4. Communication Methods

   What is the main difference between REST and messaging approaches for microservice communication?

   1. REST can only be used within the same machine.
   2. REST uses HTTP while messaging uses asynchronous message brokers.
   3. Messaging is only for error handling.
   4. REST guarantees delivery but messaging does not.
   5. Messaging always uses SOAP and REST uses JSON.

5. Message Broker Examples

   Which of the following is an example of a message broker often used in Java microservices for asynchronous communication?

   1. DataStream
   2. ActveMQ
   3. Relation Manager
   4. WebListener
   5. ActiveMQ

6. Security Basics

   Which practice helps secure microservices by ensuring only authorized users can access specific endpoints?

   1. Disabling endpoints
   2. Applying logging everywhere
   3. Using only REST instead of messaging
   4. Enabling auto-scaling
   5. Implementing authentication and authorization

7. Service Discovery

   What is the primary purpose of a service registry in a microservices architecture?

   1. To manage database migrations
   2. To generate API documentation automatically
   3. To compile Java classes at runtime
   4. To keep track of available services and their locations
   5. To store user session data

8. External Configuration

   Why is storing configuration outside of application code important in microservices?

   1. It increases the performance of database queries.
   2. It disables error messaging.
   3. It makes the services use less memory.
   4. It allows changing settings without recompiling or restarting services.
   5. It lets logs be written faster.

9. Resilience and Fault Tolerance

   Which mechanism can automatically stop repeated calls to a failing microservice, helping prevent system overload?

   1. Retry looper
   2. Circut breaker
   3. Circuit breaker
   4. Pooling scheduler
   5. Hard restarter

10. Monitoring and Observability

    What is the main purpose of monitoring microservices using metrics and logs?

    1. To store user settings.
    2. To increase network latency between services.
    3. To disable health checks.
    4. To detect and diagnose issues for better performance and reliability.
    5. To generate random API responses.