Question: What Is The Difference Between @Springbootapplication And @EnableAutoConfiguration Annotation?

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..

What is the way to provide configuration metadata to spring?

Configuration metadata can be provided to Spring container in following ways: XML-Based configuration: In Spring Framework, the dependencies and the services needed by beans are specified in configuration files which are in XML format.

What is the use of @repository annotation?

Spring @Repository annotation is used to indicate that the class provides the mechanism for storage, retrieval, search, update and delete operation on objects.

Is @component a singleton?

2 Answers. Yes, that is correct, @Component is a Spring bean and a Singleton. About singletons – spring beans are all in singleton scope by default. The only thing you have to have in mind is that you should not store state in field variables (they should only hold dependencies).

What is the difference between @bean and @component?

@Component auto detects and configures the beans using classpath scanning whereas @Bean explicitly declares a single bean, rather than letting Spring do it automatically.

What happens when SpringApplication run is called?

class, args), is a static method it returns an object of ConfigurableApplicationContext. … class, args); Thus spring container gets started once SpringApplication. run() method is called.

Can we have multiple @SpringBootApplication?

Since all your classes are in the same package, when you start any one of them Spring will find the others and treat them like @Configuration classes, and register their beans, etc. … Put each @SpringBootApplication class in a separate subpackage if you don’t want this to happen for local testing.

What is bean life cycle?

Similarly, the bean life cycle refers to when & how the bean is instantiated, what action it performs until it lives, and when & how it is destroyed. In this article, we will discuss the life cycle of the bean. Bean life cycle is managed by the spring container.

What Bean means?

noun. the edible nutritious seed of various plants of the legume family, especially of the genus Phaseolus. a plant producing such seeds. the pod of such a plant, especially when immature and eaten as a vegetable. any of various other beanlike seeds or plants, as the coffee bean.

What is difference between @configuration and @component?

@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. @Configuration – It is like beans. … @Component – You cannot autowire (@Autowired) any class if it is not marked with @Component.

What is a bean in spring?

In Spring, the objects that form the backbone of your application and that are managed by the Spring IoC container are called beans. A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. Otherwise, a bean is simply one of many objects in your application.

How bean is created in spring boot?

With the @Autowired annotation we inject our AppName bean into the field. Here we create the AppName bean; the bean is managed by Spring container. While the @Component annotation is used to decorate classes that are auto-detected by Spring scanning, the @Bean annotation is used to explicitly declare a bean creation.

What is the purpose of @configuration annotation?

Spring @Configuration annotation helps in Spring annotation based configuration. @Configuration annotation indicates that a class declares one or more @Bean methods and may be processed by the Spring container to generate bean definitions and service requests for those beans at runtime.

What is a bean in Spring MVC?

A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. … These beans are created with the configuration metadata that you supply to the container.

What is the difference between @bean and Autowired?

On Bean @Target annotation confirms that it can be applied over a METHOD. … This is an alternative to the JSR-330 Inject annotation. On Autowired @Target confirms that it can be applied over a CONSTRUCTOR,METHOD,PARAMETER,FIELD. IoC is also known as dependency injection (DI).

What is @ComponentScan?

The @ComponentScan annotation is used with the @Configuration annotation to tell Spring the packages to scan for annotated components. … When you specify basePackageClasses, Spring will scan the package (and subpackages) of the classes you specify.

What is the use of @component annotation?

@Component This annotation is used on classes to indicate a Spring component. The @Component annotation marks the Java class as a bean or component so that the component-scanning mechanism of Spring can add it into the application context.

What is @EnableAutoConfiguration in spring boot?

@EnableAutoConfiguration annotation auto-configures the beans that are present in the classpath. This simplifies the developers work by guessing the required beans from the classpath and configure it to run the application. This annotation is part of the spring boot project. For example, if you have tomcat-embedded.

What is the use of @EnableAutoConfiguration annotation?

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 classpath in spring boot?

It’s a path inside your project where you place resources. During the build step, Maven will take files in there and place them in the appropriate place for you to use them in your runtime classpath, eg in an executable . jar , some physical file system location used in the classpath (with java ‘s -cp option), etc.

Can we replace @service with @component?

According to documentaion @Repository , @Service , @Controller are all synonyms. They all just specializations of @Component annotation. So, generally, they can be used one istead of other.

Why does spring boot have minimum effort?

Does Spring Boot in anyway reduce the need to write lots of configuration? Why is it possible to get started with minimum effort on Spring Boost? The correct answer is: it has an opinionated view on Spring platform.

What is @configuration in spring boot?

@Configuration annotation is used for Spring annotation based configuration. The @Configuration is a marker annotation which indicates that a class declares one or more @Bean methods and may be processed by the Spring container to generate bean definitions and service requests for those beans at runtime.

What is the use of @component?

@Component is the most generic Spring annotation. A Java class decorated with @Component is found during classpath scanning and registered in the context as a Spring bean. @Service , @Repository , and @Controller are specializations of @Component , which are used for more specific cases.

What is bean file in Java?

In computing based on the Java Platform, JavaBeans are classes that encapsulate many objects into a single object (the bean). They are serializable, have a zero-argument constructor, and allow access to properties using getter and setter methods.

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 the use of @bean annotation?

Spring @Bean Annotation is applied on a method to specify that it returns a bean to be managed by Spring context. Spring Bean annotation is usually declared in Configuration classes methods. In this case, bean methods may reference other @Bean methods in the same class by calling them directly.

What does @bean annotation do?

@Bean is a method-level annotation and a direct analog of the XML element. The annotation supports most of the attributes offered by , such as: init-method , destroy-method , autowiring , lazy-init , dependency-check , depends-on and scope .

Why do we use annotation?

Annotations are used to provide supplement information about a program. Annotations start with ‘@’. Annotations do not change action of a compiled program. Annotations help to associate metadata (information) to the program elements i.e. instance variables, constructors, methods, classes, etc.

What is the difference between @configuration and @EnableAutoConfiguration?

The main difference between these annotations is that @ComponentScan scans for Spring components while @EnableAutoConfiguration is used for auto-configuring beans present in the classpath in Spring Boot applications.