Spring Boot Flashcards
What is Spring boot?
Sprint boot is a Java-based spring framework used for Rapid Application Development (to build stand-alone microservices). It has extra support of auto-configuration and embedded application server like tomcat, jetty, etc.
What are Microservices?
Microservices are a software architectural style in which a large application is built as a collection of small, independent services that communicate with each other over a network.
Each service is a self-contained unit of functionality that can be developed, tested, and deployed independently of the other services.
What are the advantages of using Spring Boot?
Easy to understand and develop spring applications.
Spring Boot is nothing but an existing framework with the addition of an embedded HTTP server and annotation configuration which makes it easier to understand and faster the process of development.
Increases productivity and reduces development time.
Minimum configuration.
We don’t need to write any XML configuration, only a few annotations are required to do the configuration.
What are the Spring Boot key components?
Spring Boot auto-configuration.
Spring Boot CLI.
Spring Boot starter POMs.
Spring Boot Actuators
Why Spring Boot over Spring?
Below are some key points which spring boot offers but spring doesn’t:
Starter POM.
Version Management.
Auto Configuration.
Component Scanning.
Embedded server.
InMemory DB.
Actuators
What is the starter dependency of the Spring boot module?
Spring boot provides numbers of starter dependency, here are the most commonly used -
Data JPA starter.
Test Starter.
Security starter.
Web starter.
Mail starter.
Thymeleaf starter
How does Spring Boot works?
Spring Boot automatically configures your application based on the dependencies you have added to the project by using annotation. The entry point of the spring boot application is the class that contains @SpringBootApplication annotation and the main method.
Spring Boot automatically scans all the components included in the project by using @ComponentScan annotation
What does the @SpringBootApplication annotation do internally?
The @SpringBootApplication annotation is equivalent to using @Configuration, @EnableAutoConfiguration, and @ComponentScan with their default attributes. Spring Boot enables the developer to use a single annotation instead of using multiple. But, as we know, Spring provided loosely coupled features that we can use for each annotation as per our project needs
How does a spring boot application get started?
Just like any other Java program, a Spring Boot application must have a main method. This method serves as an entry point, which invokes the SpringApplication#run method to bootstrap the application.
What are starter dependencies?
Spring boot starter is a maven template that contains a collection of all the relevant transitive dependencies that are needed to start a particular functionality.
Like we need to import spring-boot-starter-web dependency for creating a web application.
-Located in the POM file
EX: <dependency></dependency>
<groupId> org.springframework.boot</groupId>
<artifactId> spring-boot-starter-web </artifactId>
</dependency>
What is Spring Boot CLI and what are its benefits?
Spring Boot CLI is a command-line interface that allows you to create a spring-based java application using Groovy.
Example: You don’t need to create getter and setter method or access modifier, return statement. If you use the JDBC template, it automatically loads for you.
What Are the Basic Annotations that Spring Boot Offers?
The primary annotations that Spring Boot offers reside in its org.springframework.boot.autoconfigure and its sub-packages. Here are a couple of basic ones:
@EnableAutoConfiguration – to make Spring Boot look for auto-configuration beans on its classpath and automatically apply them.
@SpringBootApplication – used to denote the main class of a Boot Application. This annotation combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations with their default attributes
Can we create a non-web application in Spring Boot?
Yes, we can create a non-web application by removing the web dependencies from the classpath along with changing the way Spring Boot creates the application context.
Is it possible to change the port of the embedded Tomcat server in Spring Boot?
Yes, it is possible. By using the server.port in the application.properties
Can we override or replace the Embedded tomcat server in Spring Boot?
Yes, we can replace the Embedded Tomcat server with any server by using the Starter dependency in the pom.xml file. Like you can use spring-boot-starter-jetty as a dependency for using a jetty server in your project
