Wednesday, January 13, 2021

Top 15 Spring Cloud Interview Questions and Answers for Java/JEE Programmers

Hello guys, If you are preparing for Java and Spring Boot Interview and looking for some Spring Cloud interview questions then you have come to the right place. Earlier, I have shared 15 Spring Boot Interview questions and today, I am going to share 15 Spring cloud interview questions for Java developers. These questions are good to revise essential Spring cloud concepts before interviews. Today is the world of cloud computing and most of the new Java development is happening on Cloud like AWS, GCP, and Azure. That's why it's very important for Java developers to learn about cloud and frameworks and libraries which support cloud-native development in Java, like Spring Cloud from Spring project.

Spring is a powerful framework and probably the most popular Java framework. It is very popular and used widely throughout the world. Spring Cloud is a module provided by Spring that is used to develop cloud-based allocations. In simple words, Spring cloud provides Rapid Application Development (RAD) features to work with Spring. 

Because of its popularity and combination of Spring Boot and Spring Cloud for developing cloud-native Java applications and Microservices, you will find many Spring cloud-related questions on Java developer interviews. 

If you are preparing for a Java developer interview and your job requires knowledge of Spring Cloud and other Microservice technologies then it makes sense to spend some time learning Spring Cloud and getting yourself familiar with common and frequently asked questions. 

Since Spring Cloud is a bit complicated concept, especially for beginners. That is why there is a demand for experienced Spring cloud developers. But as mentioned, it is a complicated concept and interviews related to it have generally tough questions, hence its better to join an online course like Master Microservices with Spring Boot and Spring Cloud course by Ranga Karnam from Udemy to learn essential Spring Boot and Spring Cloud concepts before going for interviews. 

15 Spring Cloud Interview Questions with Answer

In this article, I am going to share the top 15 questions related to Spring cloud for interviews.  You can use these questions to not only prepare for the Spring Cloud interview but also to learn and explore essential Spring cloud concepts. 

If you think 15 questions is not enough then you may want to know that I am also writing a book on Grokking the Spring Boot interview where I will share more questions. You can join my list for early access and updates. 

Anyway, without wasting any more of your time, let's see popular Spring cloud questions for Java Interviews:

1. Explain Spring cloud? or, What is Spring Cloud?
Answer: Spring cloud is a set of tools that can be used by developers to quickly build some common patterns in distributed systems such as service discovery, configuration management, intelligent routing, etc.

2. What are the common features of Spring cloud?
Answer: Here is a list of some of the most common features of the Spring Cloud framework, which greatly help in developing cloud-native apps and Microservices:

a) Service registration and discovery
b) Routing
c) Service to service calls
d) Distributed and versioned configuration
e) load balancing and circuit breakers 

If you are interested to learn more about these spring cloud features then you can further see Spring Boot Microservices with Spring Cloud Beginner to Guru Udemy course by John Thompson, which provides a practical introduction of Spring Cloud for beginners. 

Top 15 Spring Cloud questions for interview Questions with Answers

3. Explain load balancing? or What is load balancing?
Answer: Load balancing is a technique used to improve the distribution of workloads across several computing resources, such as a computer cluster, CPUs, network lines, and disk drives.

4. How load balancing is implemented in Spring cloud?
Answer: We can implement load balancing in the Spring cloud using Netflix Ribbon.

5. What is the meaning of Service registration and discovery?
Answer: At the starting of a project, we usually have the entire configurations in the "properties" file. As the project proceeds and more services are developed and deployed, adding them to the properties file becomes complex. It can affect the already deployed services creating problems such as services going down or the location of some might change. Changing the properties manually can create more issues. Service registration and discovery is useful in such situations. The changes can be handled by the service registration and discovery. 

6. What is Hystrix?
Answer: Hystrix is a fault-tolerance and latency library designed for isolating points of access to remote systems, third-party libraries, services, stopping cascading failures, and enabling resilience in complex distributed systems where failure is common and cannot be avoided. 

7. Explain Netflix feign.
Answer: It is a Java to HTTP client binder. It is inspired by JAXRS-2.0, WebSocket, and Retrofit.

8. Why do we use Netflix feign?
Answer: Netflix feign is used to reduce the complexity by binding denominator uniformly to HTTP APIs regardless of the RESTfulness.

9. What is the use of the Spring cloud bus?
Answer: The spring cloud bus provides a helpful feature to refresh configurations across several multiple instances.

10. What are the advantages of Spring cloud?
Answer:  Here are key advantages of Spring Cloud 
a) Spring cloud helps in resolving complexity associated issues with distributed systems.
b) It provides service discovery which is a very helpful tool.
c) It reduces redundancy.
d) Load balancing is another helpful technique of Spring cloud.

11. What is PCF?
Answer: PCF stands for Pivotal Cloud Foundry. It is an open-source, multi-platform cloud foundry.

12. What is the purpose of the Hystrix circuit breaker?
Answer: The purpose of the Hystrix circuit breaker is to provide the first-page method or any other methods that the method in the first page might be calling and is causing the exception to recover. The chances of exception to recovery may increase because of less load. You can further see Master Microservices with Spring Boot and Spring Cloud course to learn more about Fault tolerance with Hysteric. 

spring cloud interview questions with answers

13. Name the services that provide service registration and discovery.
Answer: Eureka and zookeeper. 

14. Give the benefits of Eureka and Zookeeper?
Answer: Eureka guarantees high availability and usability while Zookeeper guarantees consistency and partition fault tolerance. 

15. What is the major difference between Spring Cloud and Spring boot?
Answer: Spring cloud is a microservice management and coordination framework used to integrate and manage individual microservices while Spring boot is used to develop these microservices. 

16. What are some common Spring cloud annotations?  (answer)
Answer: here is a list of some of the most essential Spring cloud annotations for Java developers
  1. @EnableConfigServer 
  2. @EunableEurekaServer
  3. @EnableDiscoveryClient
  4. @EnableCircuitBreaker
  5. @HystricCommand
You can further see the answer for a detailed explanation of these Spring cloud annotations with examples. 

That's all about the frequently asked Spring Cloud Interview Questions for Java and Spring Developers. You can revise these Spring Cloud questions before attending any Java and Spring framework interview. As I said, Spring cloud is complex, especially for beginners, hence it's also a good idea to spend some time learning Spring cloud itself. If you need resources, here are some highly recommend this course from Udemy and Pluralsight. 

Other Java and Spring articles you may like
  • 5 Spring Boot Annotations for full-stack Java developers (tutorial)
  • 5 Courses to learn Spring Cloud and Microservices (courses)
  • 5 Spring Boot Features Every Java Developer Should Know (features)
  • 10 Things Java Developer should learn (goals)
  • 5 courses to learn Spring Boot and Spring Cloud ( courses)
  • 20 Spring Boot Interview Questions for Java Programmers (questions)
  • Top 5 Books and Courses to learn RESTful Web Service (books)
  • 10 Tips to become a better Java developer (tips)
  • 10 Advanced Spring Boot Courses for Java Programmers (courses)
  • 10 Spring MVC annotations Java developers should learn (annotations)
  • 5 Course to Master Spring Boot online (courses)
  • 10 Courses to learn Spring Security with OAuth 2 (courses)
  • 10 Tools Java Developers use in their day-to-day life (tools)
  • 10 Pluralsight Courses to learn Spring in depth (courses)
  • 3 ways to change Tomcat port in Spring Boot (tutorial)
  • Top 5 Courses to learn Microservices in Java? (courses)
  • 3 Best Practices Java Programmers can learn from Spring (best practices)

Thanks for reading this article so far. If you found these Spring Cloud Interview questions useful then please share them with your colleagues and friends. If you have any questions or feedback then please drop a note. 

P. S. - If you want to learn about Microservices, Spring Cloud,  and Java development but looking for free resources to start with then  Developing Cloud-Native Apps with Microservices Architecture, an official free Redhat training course on Udemy is worth looking at. The course is completely free, all you need is a Udemy account to enroll in this course.

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