What is autoconfiguration spring boot?

Spring Boot auto-configuration attempts to automatically configure your Spring application based on the jar dependencies that you have added. For example, If HSQLDB is on your classpath, and you have not manually configured any database connection beans, then we will auto-configure an in-memory database.

How does autoconfiguration work in spring boot?

Spring Boot auto-configuration automatically configure a Spring application based on the dependencies present on the classpath. Spring Boot detects classes in the classpath and auto-configuration mechanism will ensure to create and wires necessary beans for us.

What is @SpringBootApplication?

Spring Boot @SpringBootApplication annotation is used to mark a configuration class that declares one or more @Bean methods and also triggers auto-configuration and component scanning. It’s same as declaring a class with @Configuration, @EnableAutoConfiguration and @ComponentScan annotations.

What dependencies does spring boot starter test brings to the classpath?

In Maven POMs, the following dependencies are added:

• springframework. boot:spring-boot-starter-web.
• springframework. boot:spring-boot-starter-actuator.
• springframework. boot:spring-boot-starter-security.

What do you mean by autoconfiguration?

Simply put, the Spring Boot autoconfiguration represents a way to automatically configure a Spring application based on the dependencies that are present on the classpath. This can make development faster and easier by eliminating the need for defining certain beans that are included in the auto-configuration classes.

What is difference between spring and spring boot?

Spring is an open-source lightweight framework widely used to develop enterprise applications. Spring Boot is built on top of the conventional spring framework, widely used to develop REST APIs. Spring Boot provides embedded servers such as Tomcat and Jetty etc.

What is autoconfiguration ipv4?

A feature of the TCP/IP protocol that assigns a class B IP address from 169.254. 0.0 to 169.254. 255.255 to a machine when a DHCP server is either permanently or temporarily unavailable.

How does boot autoconfiguration work?

Autoconfiguration is a feature that allows library developers to automatically configure beans in the Spring context based on different conditions of the application, such as the presence of certain classes in the classpath, the existence of a bean or the activation of some property.

What is Yaml in Spring boot?

In Spring Boot, we can use YAML files instead of properties files. YAML is a human-friendly data serialization standard but is mainly used for configuration files. YAML stands for YAML Ain’t Markup Language (a recursive acronym). YAML supports Maps, lists, and scalar types.

What is the difference between @component and @service?

@Component : It is a basic auto component scan annotation, it indicates annotated class is an auto scan component. @Controller : Annotated class indicates that it is a controller component, and mainly used at the presentation layer. @Service : It indicates annotated class is a Service component in the business layer.

What does spring boot test do?

Spring Boot provides a number of utilities and annotations to help when testing your application. Test support is provided by two modules: spring-boot-test contains core items, and spring-boot-test-autoconfigure supports auto-configuration for tests.

What is spring boot starter how is it useful?

Spring Boot provides a number of starters that allow us to add jars in the classpath. Spring Boot built-in starters make development easier and rapid. Spring Boot Starters are the dependency descriptors.

Why do I need to auto configure Spring Boot?

Simply put, the Spring Boot autoconfiguration represents a way to automatically configure a Spring application based on the dependencies that are present on the classpath. This can make development faster and easier by eliminating the need for defining certain beans that are included in the auto-configuration classes.

How does Spring Boot autoconfiguration work in YAML?

Application properties packaged inside your jar (application.properties and YAML variants). So, Spring Boot merely has a default set of property locations that it always tries to read in, like command line arguments, or application.properties inside your .jar file etc. Or, it ignores the location.

How does Spring Boot starter Tomcat auto configuration work?

Spring Boot Starter Tomcat’s build configuration (build.gradle) If we open that one, we see that it contains a non Spring dependency, tomcat-embed-core. This is an Apache library that contains a class Tomcat, used to start an embedded server. This is the link to the latest source file. Figure 3. Dependency Hierarchy – Tomcat Auto-Configuration

How to include a bean in Spring Boot?

If we want to include a bean only if a specified bean is present or not, we can use the @ConditionalOnBean and @ConditionalOnMissingBean annotations.