JUnit Interview Questions And Answers

What is JUnit?

JUnit is a widely used testing framework for Java applications. It provides annotations, assertions, and test runners to simplify the process of writing and running unit tests.

Spring Web Interview Questions and Answers

•  What are REST services ?

REST (Representational State Transfer) is an architectural style for building web services that interact using standard HTTP methods (GET, POST, PUT, DELETE, etc.). It relies on stateless communication and uses resource-based URIs (Uniform Resource Identifiers) for addressing.

Spring Boot Interview Questions and Answers

• What is SpringBoot ? How it is different from Spring framework ?

Spring Boot is an extension of the Spring Framework that simplifies the development of Java applications by providing auto-configuration, an embedded server, and opinionated defaults.

Spring Boot 3 : New features and migration

Spring Framework 6, released on November 2022, is the major version change and has many high-impacting features, changes and upgrades into the Spring development ecosystem. Similarly, Spring boot 3 is a major version upgrade after 4.5 years of Spring boot 2. Released on November 2022, Spring boot 3 is based on Spring Framework 6 and has lot of changes. In this article we will go through the features and migration approach to Spring boot 3.

Microservices Design Patterns : Aggregator Pattern

When breaking the business functionality into several smaller logical pieces of code, it becomes necessary to think about how to collaborate data returned by each service. The aggregator pattern helps to address this problem. In this article we will further understand about the aggregator pattern.

Microservices Design Patterns - API Gateway

When an application is broken into smaller microservices, it brings in few challenges that needs to be addressed. These include abstracting producer information, handling multiple protocols, data transformation or format conversion for different consumers and so on. To handle these challenges we can use an API gateway design pattern. In this article we'll understand further about this pattern.

Microservices Design Patterns - Strangler Pattern

Microservices are getting more and more popular these days. Many companies are migrating their monolith applications to microservices. However this is easier said than done. Decomposing a monolith with microservices comes with a lot of challenges. In this article we will learn about the Strangler Pattern that can be used to decompose or refactor a monolith into microservices.

Leetcode : Two Sum

Overview:

Two Sum is a programming problem where you are given an array and a target value and you have to find the indices of the elements in the array that add up to the target value. This is an “easy” level problem in LeetCode. In this article, we will attempt to solve this problem

Spring + Quartz : Scheduler Job with failure recovery

Most IT applications need scheduled processing e.g. maintenance, data flow, clean up etc. which are not initiated by user action. To handle this we can schedule jobs for a particular interval. But what if the job fails or server is down? We do not want to miss the data processing for the interval when job was down or failing. This article explains how to handle such scenario using a Spring and Quartz scheduler.

MapStruct: Transferring data from one bean to another

Converting data from one form to another is a highly utilized concept in IT industry. MapStruct allows annotation based bean conversion by generating mapper implementation at compile time. This makes sure there is no performance overhead at run-time.