java microservice interview questions with pdf answers (the most complete version is continuously updated)

java microservice interview questions with pdf answers (the most complete version is continuously updated)


Covers the interview points that major companies will ask. At the same time, as the version is upgraded, there may be some interview questions updated and will be kept updated simultaneously. Because of space reasons (actually I am lazy, haha), some answers are listed. See below for all answers, a total of 485 pages with a total of 20 technical points, the pdf is taken at the end of the article

1. What do you know about microservices?

2. What are the advantages of microservice architecture?

The advantages of microservices-microservice interview questions.:

Independent development-all microservices can be easily developed according to their respective functions

Independent deployment-based on their services, they can be deployed separately in any application

Fault isolation-even if a service of the application does not work, the system can continue to run

Hybrid technology stack-different languages and technologies can be used to build different services of the same application

Granular scaling-a single component can be scaled as needed, without the need to scale all components together

3. What are the characteristics of microservices?

Characteristics of microservices-Microservice interview questions:

Decoupling-The services within the system are largely separated. Therefore, the entire application can be easily built, changed and extended

Componentization-microservices are viewed as independent components that can be easily replaced and upgraded

Business capabilities-microservices are very simple and focus on a single function

Autonomy-developers and teams can work independently of each other, thereby increasing speed

Continuous delivery-system automation through software creation, testing and approval, allowing frequent software releases

Responsibility-Microservices don't care about the application as a project. Instead, they view the application as the product for which they are responsible

Decentralized governance-the focus is on using the right tools to do the right work. This means that there is no standardized model or any technological model. Developers are free to choose the most useful tools to solve their problems

Agile-Microservices support agile development. Any new features can be quickly developed and discarded again

4. What are the best practices for designing microservices?

      The following are the best practices for designing microservices: 

 5. How does the microservice architecture work?

The microservice architecture has the following components:

Client-Different users from different devices send requests.

Identity provider-verifies the identity of the user or customer and issues security tokens.

API Gateway-handles client requests.

Static content-contains all the content of the system.

Management-balance services on nodes and identify failures.

Service discovery-a guide to finding communication paths between microservices.

Content Delivery Network-A distributed network of proxy servers and their data centers.

Remote Service-Enable remote access to information residing on the IT equipment network

6. What are the advantages and disadvantages of the microservice architecture?

7. Monolithic, what is the difference between SOA and microservice architecture?

The monolithic architecture is similar to a large container, in which all the software components of the application are assembled and tightly packaged.

A service-oriented architecture is a collection of services that communicate with each other. Communication can involve simple data transfer, or it can involve two or more services that coordinate certain activities.

Microservice architecture is an architectural style that builds applications as a collection of small autonomous services modeled on business domains.

8. What challenges do you face when using microservice architecture?

It sounds easy to develop some smaller microservices, but the challenges that are often encountered when developing them are as follows.

Automation components: difficult to automate because there are many smaller components. Therefore, for each component, we must follow the various stages of Build, Deploy and Monitor.

Susceptibility: Maintaining a large number of components together becomes difficult to deploy, maintain, monitor, and identify problems. It needs to have good perception around all components.

Configuration management: Sometimes it becomes difficult to maintain the configuration of components in various environments.

Debugging: It is difficult to find every service that is wrong. Maintaining centralized logging and dashboards to debug issues is critical.

9. What is the main difference between SOA and microservice architecture?

The main differences between SOA and microservices are as follows:

10. What are the characteristics of microservices?

You can list the characteristics of microservices as follows:

11. What is domain-driven design? 

12. Why do I need Domain Driven Design (DDD)?

13. What is the ubiquitous language? 

If you must define a ubiquitous language (UL), then it is a universal language used by developers and users of a specific domain, through which the domain can be easily interpreted. Ubiquitous language must be very clear so that it puts all team members on the same page and translates in a way that the machine can understand.

14. What is cohesion?

The degree to which the elements within the module belong is considered cohesion.

15. What is coupling?

A measure of the strength of dependencies between components is considered coupling. A good design is always considered to have high cohesion and low coupling.

16. What is REST/RESTful and what is its purpose?

Representational State Transfer (REST)/RESTful Web service is an architectural style that helps computer systems communicate over the Internet. This makes microservices easier to understand and implement.

Microservices can be implemented with or without RESTful APIs, but it is always easier to build loosely coupled microservices using RESTful APIs.

17. What do you know about Spring Boot?

In fact, with the addition of new functions, springs have become more and more complex. If you must start a new spring project, you must add the build path or add maven dependencies, configure the application server, and add the spring configuration. So everything must start from the beginning.

Spring Boot is the solution to this problem.

Using spring boot can avoid all boilerplate code and configuration.

Therefore, basically think of yourself as if you are baking a cake, spring is like the ingredients needed to make a cake, and spring boots are the complete cake in your hands. 

18. What is a Spring boot actuator?

The Spring Boot executor provides restful Web services to access the current state of running applications in the production environment. With the help of the actuator, you can check various indicators and monitor your application. 

19. What is Spring Cloud?

20. What problems does Spring Cloud solve?

21. What is the use of WebMvcTest annotations in Spring MVC applications? 

22. Can you give some points about rest and microservices? 

23. What are the different types of microservice testing? 

24. What do you know about Distributed Transaction?

25. What is Idempotence and where is it used? 

26. What is a bounded context? 

27. What is two-factor authentication? 

28. What are the credential types for two-factor authentication? 

29. What is a client certificate? 

30. What is the purpose of PACT in the microservice architecture?

31. What is OAuth?

32. What is Conway's law?

33. What do you know about contract testing?

34. What is end-to-end microservice testing? 

35. What is the purpose of Container in microservices?

The above interview questions are all sorted into PDF documents, hoping to help you review before the interview and find a good job. Relatively speaking, it also saves you the time to search for information on the Internet to learn! ! !

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