- What is @controller in spring?
- What is difference between @controller and @RestController in spring?
- What is a bean in spring?
- What is difference between @component and @configuration?
- Can we use @component instead of @repository?
- What is use of @component in Spring?
- What is the use of @component annotation?
- What does Bean annotation do?
- What is spring bean life cycle?
- Can we replace @service with @component?
- Can we replace @controller with @component?
- Is @component a singleton?
What is @controller in spring?
Controller – A controller contains the business logic of an application.
Here, the @Controller annotation is used to mark the class as the controller.
Front Controller – In Spring Web MVC, the DispatcherServlet class works as the front controller.
It is responsible to manage the flow of the Spring MVC application..
What is difference between @controller and @RestController in spring?
Difference between @RestController and @Controller in Spring. … The @Controller is a common annotation that is used to mark a class as Spring MVC Controller while @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody.
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.
What is difference between @component and @configuration?
@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.
Can we use @component instead of @repository?
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.
What is use of @component in Spring?
@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. … Methods decorated with @Bean produce a bean to be managed by the Spring container during configuration stage.
What is the use of @component annotation?
Spring Framework Stereotype Annotations 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 does Bean annotation do?
@Bean is a method-level annotation and a direct analog of the XML
What is spring bean life cycle?
A “Spring bean” is just a Spring managed instantiation of a Java class. The Spring IoC container is responsible for instantiating, initializing, and wiring beans. The container also manages the life cycle of beans. Spring provides several ways through which you can tap into the bean lifecycle.
Can we replace @service with @component?
2 Answers. 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.
Can we replace @controller with @component?
2 Answers. @Controller is a @Component (just like @Service , @Repository , @Endpoint etc.). The @Component is used as a meta-annotation here so that it can be picked-up using component-scanning. Next to that the @Controller is a special component which will have some added functionality (Spring MVC takes care of that).
Is @component a singleton?
Yes, that is correct, @Component is a Spring bean and a Singleton. About singletons – spring beans are all in singleton scope by default.