What Is @Configuration In Spring?

What is @EnableAutoConfiguration in spring?

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 difference between @bean and @autowired?

Annotating @Bean only registers the service as a bean(kind of an Object) in spring application context. In simple words, it is just registration and nothing else. @Autowired BookingService bookingService; Annotating a variable with @Autowired injects a BookingService bean(i.e Object) from Spring Application Context.

Why @component is used in spring?

Spring Component annotation is used to denote a class as Component. It means that Spring framework will autodetect these classes for dependency injection when annotation-based configuration and classpath scanning is used.

How many ways can you set up spring?

There are three ways to define configuration, available in Spring 4 by default:xml-based configuration, when you describe configuration in xml file;java-based configuration, when configuration is Java class, marked with specific annotations;groovy-based configuration, when configuration is file with Groovy code;

What is a Yaml config file?

Definition. YAML is a human-readable data serialization standard that can be used in conjunction with all programming languages and is often used to write configuration files.

What is the use of @bean in spring?

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 is the difference between @component and @ComponentScan?

Using the annotation @ComponentScan , you can tell Spring where do your Spring-managed components lie. … On the other hand, @Component is a generic annotation for any Spring-Managed component. For example – If you create a class called Testing inside the package com. example.

What 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’s a configuration?

1a : relative arrangement of parts or elements: such as. (1) : shape. (2) : contour of land configuration of the mountains. (3) : functional arrangement a small business computer system in its simplest configuration.

What is @configuration annotation in spring?

@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. … This is called Spring Java Config feature (using @Configuration annotation).

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.

What are spring containers?

The Spring container is at the core of the Spring Framework. The container will create the objects, wire them together, configure them, and manage their complete life cycle from creation till destruction. The Spring container uses DI to manage the components that make up an application. … springframework. beans.

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.

What is the use of @configuration?

In computing, configuration files (commonly known simply as config files) are files used to configure the parameters and initial settings for some computer programs. They are used for user applications, server processes and operating system settings.

What does @bean do in spring?

The @Bean annotation returns an object that spring registers as a bean in application context. The logic inside the method is responsible for creating the instance.

What is difference between @component and @bean?

@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 is bean life cycle in spring?

Bean life cycle is managed by the spring container. When we run the program then, first of all, the spring container gets started. After that, the container creates the instance of a bean as per the request and then dependencies are injected. And finally, the bean is destroyed when the spring container is closed.

What is Classpath scanning in spring?

This means Spring is able to auto scan, detect and instantiate beans from pre-defined project package, hence saving us from tedious beans/component declaration in XML file. …