Here is our top 5 list of the most common Spring Boot Interview Questions based on our recent survey.
1. What is Spring Boot? Why should we use it?
Spring Boot is a Java framework from Sring umbrella which is developed to simplify the use of Spring Framework for Java development. It helps in automation, configuration, and dependencies.
Why should we use it? It provides a lot of convenience by auto-configuration which helps improve productivity because it allows developers and programmers to focus on writing the business logic.
2. What is starter dependency in Spring Boot?
This question is usually asked because after examining several Spring-based projects, they noticed that there is always some set of libraries which are used together e.g. Spring MVC with Jackson for creating RESTful web services. Since declaring a dependency in Maven’s pom.xml is difficult, they combined many libraries into one based upon functionality and created this starter package.
This saves you a lot of hassles from declaring many dependencies. Moreover, frees you from compatibility and version mismatch issue.
3. What is Spring Initializer and why should you use it?
It helps in initial setup – it’s a web application that helps you to create initial Spring boot project structure and provides Maven or Gradle build file to build your code.
4. Where do you define properties in Spring Boot application?
You can define related properties into a file called application.properties. This can be done manually or you can use Spring Initializer to create this file, albeit empty.
You don’t need to do any special configuration to instruct Spring Boot load this file. If it exists in classpath then Spring Boot automatically loads it and configure itself and application code according.
5. What is the difference between an embedded container and a WAR?
The main difference between these two is that you can run Spring Boot application as a JAR from the command prompt without setting up a web server. To run a WAR file, you need to set up a web server.
Thanks for reading our first article so far. If you like these Spring Boot Interview Questions then please share with your friends and colleagues. If you have any feedback or doubt then please leave us a comment.
By the way, I am also really happy to announce some very exciting news: to celebrate the imminent release of Spring 5 and Java 9, we launched our simulators SALE CAMPAIGN. We halved the price of our simulators at www.springmockexams.com and www.javamockexams.com for limited time only. Take a look here bit.ly/SMEBP and here bit.ly/JMEBP
If you are interested in collaborating with us, you can join our partner program at bit.ly/SMEPART and here bit.ly/JMEPART