- What is the use of @repository annotation?
- What is the purpose of @controller annotation?
- What is use of @autowired in spring?
- What is the use of Autowired annotation in spring?
- What does @transactional annotation do?
- What does @configuration do in spring boot?
- What is the use of @service annotation?
- What is use of annotation in spring?
- What is annotation used for?
- What is difference between @bean and @component?
- What does @service do in spring?
- What is the difference between @component and @service in spring boot?
What is the use of @repository annotation?
@Repository is a Spring annotation that indicates that the decorated class is a repository.
A repository is a mechanism for encapsulating storage, retrieval, and search behavior which emulates a collection of objects..
What is the purpose of @controller annotation?
The basic purpose of the @Controller annotation is to act as a stereotype for the annotated class, indicating its role. The dispatcher will scan such annotated classes for mapped methods, detecting @RequestMapping annotations (see the next section).
What is use of @autowired in spring?
Advertisements. 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 use of Autowired annotation in spring?
The @Autowired annotation in spring automatically injects the dependent beans into the associated references of a POJO class. This annotation will inject the dependent beans by matching the data-type (i.e. Works internally as Autowiring byType).
What does @transactional annotation do?
So when you annotate a method with @Transactional, Spring dynamically creates a proxy that implements the same interface(s) as the class you’re annotating. And when clients make calls into your object, the calls are intercepted and the behaviors injected via the proxy mechanism.
What does @configuration do in spring boot?
Spring @Configuration annotation is part of the spring core framework. Spring Configuration annotation indicates that the class has @Bean definition methods. So Spring container can process the class and generate Spring Beans to be used in the application.
What is the use of @service annotation?
@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. For example, you could directly call a DAO class to persist an object to your database but this is horrible.
What is use of annotation in spring?
Starting from Spring 2.5 it became possible to configure the dependency injection using annotations. So instead of using XML to describe a bean wiring, you can move the bean configuration into the component class itself by using annotations on the relevant class, method, or field declaration.
What is annotation used for?
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 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 does @service do in spring?
The @Component annotation marks a java class as a bean so the component-scanning mechanism of spring can pick it up and pull it into the application context. The @Service annotation is also a specialization of the component annotation.
What is the difference between @component and @service in spring boot?
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.