Quick Answer: What Is @SpringBootApplication In Spring Boot?

What is the use of @EnableAutoConfiguration in spring boot?

Annotation Type EnableAutoConfiguration Enable auto-configuration of the Spring Application Context, attempting to guess and configure beans that you are likely to need.

Auto-configuration classes are usually applied based on your classpath and what beans you have defined.

For example, if you have tomcat-embedded..

What is the use of SpringBootServletInitializer in spring boot?

SpringBootServletInitializer is an interface to run SpringApplication from a traditional WAR deployment. It binds Servlet, Filter and ServletContextInitializer beans from the application context to the server.

What is use of @autowired in spring?

Autowiring feature of spring framework enables you to inject the object dependency implicitly. It internally uses setter or constructor injection. Autowiring can’t be used to inject primitive and string values. It works with reference only.

What is difference between @bean and component?

@Component is a class level annotation whereas @Bean is a method level annotation and name of the method serves as the bean name. @Component need not to be used with the @Configuration annotation where as @Bean annotation has to be used within the class which is annotated with @Configuration.

What’s the difference between @component @controller @repository & @service annotations in spring?

The difference between them is, @component is used to annotate compound classes, @Repository is a marker for automatic exception translation in the persistence layer, for service layer we need to use @service. You can refer Spring Documentation to know more.

What is Spring REST API?

Spring RestController annotation is used to create RESTful web services using Spring MVC. Spring RestController takes care of mapping request data to the defined request handler method. Once response body is generated from the handler method, it converts it to JSON or XML response.

What is the difference between @component and @ComponentScan?

@Component vs. @Component and @ComponentScan are for different purposes. @Component indicates that a class might be a candidate for creating a bean. It’s like putting a hand up. @ComponentScan is searching packages for Components.

Does spring boot use Tomcat?

By default, Spring Boot uses Tomcat 7. If you want to use Tomcat 8, just say so! You need only override the Maven build’s tomcat. version property and this will trigger the resolution of later builds of Apache Tomcat.

Does spring boot require Tomcat?

Spring Boot has a complete Tomcat inside. It builds a so-called fat-jar with everything needed inside. You don’t need Tomcat installed in your system. BTW: Spring Boot also supports other application servers like Jetty.

What is @ComponentScan?

The @ComponentScan annotation is used with the @Configuration annotation to tell Spring the packages to scan for annotated components. @ComponentScan also used to specify base packages and base package classes using thebasePackageClasses or basePackages attributes of @ComponentScan.

What is difference between @controller and @RestController in spring?

Difference between @RestController and @Controller in Spring. … The @Controller is a common annotation that is used to mark a class as Spring MVC Controller while @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody.

What is the use of @SpringBootApplication annotation?

We use the @SpringBootApplication annotation in our Application or Main class to enable a host of features, e.g. Java-based Spring configuration, component scanning, and in particular for enabling Spring Boot’s auto-configuration feature.

What is @RestController in spring boot?

@RestController is a convenience annotation for creating Restful controllers. It is a specialization of @Component and is autodetected through classpath scanning. It adds the @Controller and @ResponseBody annotations. It converts the response to JSON or XML.

What is the difference between @configuration and @component in Spring?

@Component Indicates that an annotated class is a “component”. Such classes are considered as candidates for auto-detection when using annotation-based configuration and classpath scanning. A @Configuration is also a @Component, but a @Component cannot act like a @Configuration.

Can we deploy spring boot application in Tomcat?

Deploying applications is hard. Often you need console access to the server from which you pull the latest code and then manually instantiate into your container.