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what is service annotation in spring

by Moses Hartmann Published 3 years ago Updated 2 years ago

Spring @Service annotation is a specialization of @Component annotation. Spring Service annotation can be applied only to classes. It is used to mark the class as a service provider.

Full Answer

When to use @service annotation in Spring context?

So overall @Service annotation is used with classes that provide some business functionalities. Spring context will autodetect these classes when annotation-based configuration and classpath scanning is used. Add the spring-context dependency in your pom.xml file.

What is @service annotation in Java?

One most important thing about the @Service Annotation is it can be applied only to classes. It is used to mark the class as a service provider. So overall @Service annotation is used with classes that provide some business functionalities.

What are annotations in Spring Boot?

Now talking about Spring Annotation Spring Annotations are a form of metadata that provides data about a program. Annotations are used to provide supplemental information about a program. It does not have a direct effect on the operation of the code they annotate.

What is repository annotation in spring?

You can refer Spring Documentation to know more. Hereof, what is Repository annotation in spring? Spring @Repository annotation is used to indicate that the class provides the mechanism for storage, retrieval, search, update and delete operation on objects. What is the meaning of stereotype annotations in spring?

What is the use of service annotation?

It is used to mark the class as a service provider. So overall @Service annotation is used with classes that provide some business functionalities. Spring context will autodetect these classes when annotation-based configuration and classpath scanning is used. Add the spring-context dependency in your pom.

What is @service and @component in Spring?

@Component is a generic stereotype for any Spring-managed component. @Service annotates classes at the service layer. @Repository annotates classes at the persistence layer, which will act as a database repository.

What is @service annotation in Java?

@Service. This annotation is used on a class. @Service marks a Java class that performs some service, such as executing business logic, performing calculations, and calling external APIs. This annotation is a specialized form of the @Component annotation intended to be used in the service layer.

What is difference between @service and @bean?

If we see component class like @Controller, @service, @repository will be scan automatically by the spring framework using the component scan. @Bean on the other hand can only be used to explicitly declare a single bean in a configuration class.

What is @service and repository?

Both @Service and @Repository annotations are the specializations over the @Component annotation. @Repository is a stereotype used for persistence layer. It translates any persistence related exceptions into a Spring's DataAccessException. @Service is used for the beans at the service layer.

What is @service and @repository?

@Service annotation is used with classes that provide some business functionalities. @Repository Annotation is used to indicate that the class provides the mechanism for storage, retrieval, update, delete and search operation on objects. @Service Annotation is a specialization of @Component Annotation.

What is @service used for?

@Service annotation is used in your service layer and annotates classes that perform service tasks, often you don't use it but in many case you use this annotation to represent a best practice.

What is service annotation in Spring boot?

Spring @Service annotation is a specialization of @Component annotation. Spring Service annotation can be applied only to classes. It is used to mark the class as a service provider.

What is difference between @controller and @service?

@Controller annotation indicates that a particular class serves the role of a controller. @Service annotation is used with classes that provide some business functionalities.

Can I use @component instead of @service?

If your component is a generic component, not really living at the service layer, or is accessible but could hold state, then use @Component . If your component is a specific service, living at the service layer, or is accessible and does not inherently hold state, use @Service .

What is @repository in Spring?

@Repository Annotation is a specialization of @Component annotation which is used to indicate that the class provides the mechanism for storage, retrieval, update, delete and search operation on objects.

Can we replace @service with @repository?

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

Complete Code

Note that we have created ApplicationContext and retrieved bean using getBean () method:

About Me

Hi, I am Ramesh Fadatare from India, a founder, author, designer and chief editor of a website JavaGuides, a technical blog dedicated to the Java/Java EE, Web technologies and frameworks.

Why do developers put @service on interfaces?

Some developers may decide to put @Service on interfaces because they want to: Explicitly show that an interface should only be used for service-level purposes. Define new service implementations and have them automatically detected as Spring beans during startup.

Does Spring pick up classes?

Spring's component scanning doesn't pick up the classes unless they are annotated separately, even they're derived from another @Service annotated interface or abstract class. Plus, Spring's documentation also states that using @Service on implementation classes allows them to be autodetected by the component scan. 6.

What is Spring Boot annotation?

Spring Boot Annotations is a form of metadata that provides data about a program. In other words, annotations are used to provide supplemental information about a program. It is not a part of the application that we develop. It does not have a direct effect on the operation of the code they annotate. It does not change the action of the compiled program.

What is @EnableAutoConfiguration?

@EnableAutoConfiguration: It auto-configures the bean that is present in the classpath and configures it to run the methods. The use of this annotation is reduced in Spring Boot 1.2.0 release because developers provided an alternative of the annotation, i.e. @SpringBootApplication.

What does @required mean?

@Required: It applies to the bean setter method. It indicates that the annotated bean must be populated at configuration time with the required property, else it throws an exception BeanInitilizationException.

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