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50 microservices interview questions for Java developers
Upasana | November 22, 2020 | 2 min read | 1,250 views | microservices-architecture
In this article we will discuss top 50 Spring Microservices interview questions for experienced Java Developers.
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What is Spring Boot? What are advantages of using Spring Boot?
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What are microservices?
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What are differences between SOA and Microservices architecture?
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Why would you opt for microservices architecture?
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What are advantages and disadvantages of microservices?
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What are key characteristics of Microservices?
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What is Spring Cloud?
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What are advantages of using Spring Cloud?
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How will you decompose a given business functionality into microservices architecture?
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Define Domain Driven Design?
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What is Bounded Context?
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What is Idempotent operation? Which methods should be made idempotent?
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What is eventual consistency?
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What is client side load balancing, how is it implemented in Spring Cloud?
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How to implement server side load balancing using Spring Cloud?
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How will you write a bare minimal spring cloud application?
Concepts
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What is 12 factor app?
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What is coupling and cohesion?
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How does microservices architecture look like?
Security
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What is OAuth2 protocol at a high level?
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How to propagate security context from one microservice to another?
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What is client credentials?
Testing
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How will you test microservices? What are major challenges in microservices testing?
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What is PACT?
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What is CDC? Consumer Driven Contracts,
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How to test a single component using Spring Boot WebMvcTest?
Deployment
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How do you deploy a simple spring boot based application?
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What is blue-green deployment pattern?
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What is Docker? how to deploy spring boot application using docker?
Best Practices
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Common Mistakes Made While Transitioning To Microservices
Microservices Design Patterns
Service Boundary Decomposition Patterns
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Decompose by Domain (aka business capability)
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Strangler Pattern
Integration Patterns
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Service registration and discovery pattern: Netflix Eureka Service, Discovery Client, etc.
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API Gateway pattern: Netflix Zuul API Gateway, Spring Cloud Gateway.
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Aggregator pattern
Database Patterns
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Database per service pattern
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What is Saga pattern?
Logging Patterns
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Log correlation and distributed tracing pattern: How to correlate logs when a single API call spans across multiple microservices? Anything about Zipkin and Sleuth?
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Log aggregation: How to aggregate logs from different microservices into a centralized system for easy access. ELK (Elastic Search Logstash and Kibana), and Graylog, etc.
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Performance metrics: How to gather performance metrics? Tracing in distributed systems.
Resiliency Patterns
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What is Circuit Breaker Design Pattern in microservices? Talk about netflix hystrix implementation.
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Bulk head design pattern. Hystrix implementation using netflix OSS
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Client side load-balancing. How to achieve client side load balancing using netflix ribbon.
Development Patterns
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Distributed configuration management
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Asynchronous messaging: RabbitMQ, Kafka, ActiveMQ etc for asynchronous messaging in distributed systems.
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Inter-service communication: Async and Sync communication. RestTemplate and WebClient for inter service communication. OpenFeign as a declarative REST client.
Deployment Patterns
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Blu-Green deployment pattern
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Using AWS Code deploy for deployment
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Docker containerization
Top articles in this category:
- Cracking Spring Microservices Interviews - question bank
- Why Microservices are better than Monoliths
- How will you Partition a typical e-shop into Microservices Architecture
- Is it a good practice to deploy multiple microservices in a single tomcat container
- Spring Cloud and its advantages
- What is Spring Boot and what are its advantages
Recommended books for interview preparation:
Book you may be interested in..
Book you may be interested in..
