What is the use of Autowired annotation in Spring?
Table of Contents
- 1 What is the use of Autowired annotation in Spring?
- 2 What is the difference between @component and @bean in Spring?
- 3 Can I Autowire a POJO class?
- 4 What does @repository annotation do?
- 5 What is difference between @configuration and @component?
- 6 What is the difference between @autowired and @inject annotation in spring?
What is the use of Autowired annotation in Spring?
The @Autowired annotation provides more fine-grained control over where and how autowiring should be accomplished. The @Autowired annotation can be used to autowire bean on the setter method just like @Required annotation, constructor, a property or methods with arbitrary names and/or multiple arguments.
What is the difference between @component and @bean in Spring?
@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 is the use of component annotation in Spring?
@Component is an annotation that allows Spring to automatically detect our custom beans. In other words, without having to write any explicit code, Spring will: Scan our application for classes annotated with @Component. Instantiate them and inject any specified dependencies into them.
What is difference between @autowired and @inject?
@Inject and @Autowired both annotations are used for autowiring in your application. @Inject annotation is part of Java CDI which was introduced in Java 6, whereas @Autowire annotation is part of spring framework. It is a part of Java CDI so it is not dependent on any DI framework. It makes your system loosely coupled.
Can I Autowire a POJO class?
The @Autowired annotation in spring automatically injects the dependent beans into the associated references of a POJO class. Developers can apply the @Autowired annotation to the following: @Autowired on property. @Autowired on the setter method.
What does @repository annotation do?
The @Repository annotation is a marker for any class that fulfils the role or stereotype of a repository (also known as Data Access Object or DAO). Among the uses of this marker is the automatic translation of exceptions, as described in Exception Translation.
What are annotations in Spring boot?
Spring Boot Annotations is a form of metadata that provides data about a program that is not a part of the program itself. They do not have any direct effect on the operation of the code they annotate. Spring Boot Annotations do not use XML and instead use the convention over configuration principle.
What is the difference between @SpringBootApplication and @EnableAutoConfiguration annotation?
@SpringBootApplication is a newer version of @EnableAutoConfiguration which was introduced in Spring Boot 1.2. @ComponentScan enables component scanning so that web controller classes and other components that you create will be automatically discovered and registered as beans in spring’s application context.
What is difference between @configuration and @component?
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.