Java Micro Services Interview Questions- With Simple Answers

Java Micro Services Interview Questions

In this article, we will see the Java Micro Services Interview Questions with answers.


Microservices are basic mini services that de-source and deploy some giant product which mostly is a Saas product. Microservices are essential because developers work and create files, software, and products so huge that it’s really hard for a company to use a particular function or piece of the file that is the only need for the company. 

  • This has various applications in every tech-based industry and sometimes beyond too.
  • The core concept is the breakage of a huge product into smaller compressed and customizable packets of codes and products. Since the data getting generated every day is vividly huge. 
  • The need for a java microservice developer or engineer is in high demand in the industry.

What is Java Microservices? 

Microservices are a service that decompiles the product to get a particular product.  It is the hierarchical management of services that are provided by the seller and then modified by the buyer or the admin. The model can change its hierarchy whenever the user wants to. 

  • Basically, the code of these microservices is scripted in java or its frameworks such as node.js, Angular.js, and .net. This is the reason why we call it a Java microservice. 
  • Java is a great tool or language for microservices in specific and always has persisted being the developer’s favorite. 
  • The reason behind this is that java is specialized for writing annotation syntax which makes the code’s readability much enhanced. A special framework such as Spring Boot is very supportive for java microservice codes to undergo this specifically enhanced code readability. 
  • The last and best point for one opting to use java in its microservice is that this readability enhancement not only enriches the look and easy understandability but, also makes a mindset of ease and comfort to the developer to work stress-free because taking long durations to know what is what in complex and paragraph codes is a serious concern for this solution.

Scope and Market Insights     

Java microservices have an ever-growing increased demand in need due to the extensive deployment of Saas products by different companies with various domains and targets. 

Interview Questions with answers

  1. Explain in detail about Spring Cloud and its usage in microservices. (This is a very important question and its frequency rate of 9/10 and importance rate of 7.5/10)

Answer: Spring Cloud is a system that integrates external systems and provides corporation. It is a framework that has a short life. It builds the applications in a very rapid manner when compared to the other frameworks in use and persists to stand back as the top frameworks used in programming microservices. 

  • Advantages of Spring Cloud for securing this position successfully includes: 
  • Service to service call facility, 
  • Discovery and visibility of service’s registration,
  • Routing enabled,
  • Circuit breaks and load balancing enabled and expertise.
  • And, has global locks with message distributing systems adopted.
  1. What is Spring Boot? (Its Frequency rate is 8/10 and Importance rate is 8.5/10)

Answer: Spring boot is an easier version and the solution that is used to avoid massive code configurations at a stretch. The reason for its emergence and importance in microservices is that a new project’s beginning should have added a new path and dependency to that project. Which means the entire process is recommitted from right scratch. And that is why spring got a little complex to use and Spring Boot got its privileges in the industry. Spring boot is a premade context due to which you are now not starting the product deployment from scratch.

  1. How can the process of Spring Security be implemented in Spring Boot Application? (Its Frequency rate is 8/10 and Importance rate is 8.5/10)

Answer: The minimal configuration and compatible features are needed for ease in developing the microservice or breaking the product. The process of addition of spring boot to spring comprises of the following steps:

  • Add the spring-boot-starter-security-starter in the file pom.xml. 
  • Create a spring ‘config’ class to overwrite and ride the methods required.
  • Extend the Web Security Configurator Adapter.
  • Now that your software has possessed the necessary security to the application.
  1. Define a Semantic Monitoring Process. (Its Frequency rate is 7.5/10 and Importance rate is 9/10)

Answer: Semantic Monitoring is a process that combines the entire application and precedes an automated test. It monitors bugs and fixes to the application. The basic and prime work that semantic monitoring possesses is that it searches and identifies factors that are making improvable and profitable changes to the business in the wider perspective. And thus, adapting semantic monitoring definitely upgrades and softens the application’s process.

  1. Why should Company Choose microservice architecture? (Its Frequency rate is 6/10 and Importance rate is 9.5/10)

Answer: A company should opt for microservice architecture because, 

  • The failure caused in a single process is kept disinfected from the other programs preceding it when the big task is broken into smaller microservices.
  • It is short and easy to install due to the size, hence forms easier adaptability.
  • It could deploy things more independently and in a lesser time consumption when compared to other architecture or services. 
  • It supports both larger and heavy-budget projects and small teams and growing companies. 
  1. Explain the reason behind investors and companies being less willing to adopt microservices? (Its Frequency rate is 9/10 and Importance rate is 9/10)

Answer: Four major reasons answers all the subsets for companies denying usage of microservices for the projects. They are:

  • Architecture’s setup being a heavy concept,
  • Staff selection gets autonomous,
  • The planning is made excessive and handling operations are over headed.
  • The major reason is the difficulty to invest in this service as the architecture requires higher investments.
  1. What are the prime uses of Dashboards and Reports? Why is it needed in microservices? (Its Frequency rate is 8.5/10 and Importance rate is 8/10)

Answer: It is necessary to find which microservice would expose the right resource and which resource does each of the microservices have in it, analyze the impact able services getting applied when tracing changes in components, shows all the versions from the time when the microservice has started deployment, makes ease in pointing the documentation and access, compliance of the components is regulated and monitored. 

  1. What is a Domain-Driven Design? (Its Frequency rate is 7/10 and Importance rate is 9/10)

Answer: The design’s complexity is identified with its domain’s model. Which makes the Domain-Driven Design very important and a prime feature for the application to run? The core elements of DDD are the description of what DDD is. This includes the following:

  • DDD focuses on domain logic to the core and its own domain along with it.
  • It improves the model’s design and acknowledges the issues spotted.  
  • It constantly runs for finding collaborative modes with domain experts and softens the process.
  • The completion of the domain takes place at the model of the domain itself.
  1. Mention any two ways to access Restful Microservices. (Its Frequency rate is 6/10 and Importance rate is 9/10)

Answer: Restful microprocessors can be accessible by two major methods. They include:

  • Accessing the microservices with the usage of multiple microservices.
  • And, using the rest template which balances the load.
  1. What are the hurdles a micro service’s testing would face? (Its Frequency rate is 9.5/10 and Importance rate is 9.5/10)

Answer: When we look through the negative side of accessing the microservices, 

  • If there is a need to work in independent teams and finish the project at separate ends, then compilation or integrating the coordination is made difficult.
  • No. of microservices = rate of complexity to handle and deploy applications.
  • Internal communications being undisturbed with the components will only run the monolithic architecture’s transition. Hence, testers must be concentrated on checking this.
  • The software or microservice tester should have a thorough understanding of the inbounding and out bounding mechanisms before beginning with the testing processes.
  1. Mention three mistakes that are commonly caused in transitioning to microservices. (Its Frequency rate is 8.5/10 and Importance rate is 9/10)

Answer: Rewriting the programs which already exist is a prime mistake that is commonly committed when processing transitioning to microservices. The developer failing to outline and script out the current challenges is a second major mistake that is being committed frequently. Failing to add implementation and figuring out the scope and dimension of the automated programming and processing from the start is a fatal mistake that is caused by less knowledge or carefree works. These are the three mistakes that are commonly caused while transitioning to microservices.


The core concept is the breakage of a huge product into smaller compressed and customizable packets of codes and products. The need for a java microservice developer or engineer is in high demand in the industry. Java is a great tool or language for microservices in specific and always has persisted being the developer’s favorite. This article covered detailed notes about important interview questions that are frequently asked along with their frequency and importance rating.

Java Micro Services Interview Questions- With Simple Answers

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