Java Spring Boot & Microservices | Java Spring Boot & Microservices Interview Questions Set - 4

Q31. How to access Restful Microservices?

Restful Microservices can be accessed in ways by using a rest template that is load balanced and by using multiple microservices.

Q32. How to perform Security Testing for Microservices?

Security Testing for Microservices can be possible in different ways like ensure that any line of code is bug-free and can be replicated, security solution should be flexible so that it can be adjusted as per the requirements of the system, security protocols should be flexible and updated to cope up with the new threats by hackers or security breaches, etc.

Q33. What are the Challenges while testing Microservices Application.?

While testing microservices application test engineers should have a thorough understanding of all the inbound and outbound processes before he starts writing the test cases for integration testing. When independent teams are working on different functionalities, collaboration can prove to be quite a struggling task. It can be tough to find an idle time-window to perform a complete round of regression testing.

Q34.Explain the inter communication between Microservices.?

One Microservice will communicate with other Microservice by implementing Restful services for incoming request and for outgoing response, by using third party server programs will helps in better communication, by using web sockets for streaming.

Q35. What is Distributed Transaction in Microservices.?

Transactions are distributed to several services to complete the transaction in sequence with so many moving parts, it is very complex and prone to failure. Distributed transactions are an outdated approach in today's microservice architecture that leaves the developer with severe scalability issues.

Q36. How to test end-to-end Microservices Application?

Usually, end-to-end (E2E) microservice testing is used to ensure that all components work together for a complete user journey. Usually, it is done through the user interface application from test environment. It also ensures all processes in the workflow are working properly.

Q37. What is Eureka Server in Microservices.?

Eureka Server also known as Netflix Service Discovery Server, is an application that keeps track of all client-service applications. As every Microservice registers to Eureka Server, Eureka Server knows all the client applications running on the different ports and IP addresses. It generally uses Spring Cloud and is not heavy on the application development process.

Q38. What is the use of docker in microservices?

Docker generally provides a container environment, in which any application can be hosted. This is accomplished by tightly packaging both the application and the dependencies required to support it. These packaged products are referred as Docker Containers. Docker allows you to containerize your microservices and manage these microservices more easily.

Q39. What are Reactive Extensions in Microservices?

Reactive extensions are also known as Rx, is basically a design approach that calls multiple services and then generates a single response by combining the results. The calls can be synchronous or asynchronous. A popular tool in distributed systems, Rx works exactly opposite to legacy flows.

Q40. What is the advantage of using Eureka Server in Microservices.?

Netflix's Eureka is the most efficient in setting up service discovery. This is a hassle-free procedure that doesn't add much weight to the application. It also supports a wide range of web applications. Several annotations are provided by Spring Cloud to make its use as simple as possible and to hide complex concepts in building service discovery.