What Is Use Of @Repository In Spring?

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..

Can we use @repository instead of @service?

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. But … you should not do this.

What is JPA in spring?

Spring Data JPA API provides JpaTemplate class to integrate spring application with JPA. JPA (Java Persistent API) is the sun specification for persisting objects in the enterprise application. It is currently used as the replacement for complex entity beans.

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.

What is the use of @configuration in spring?

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. 2 What if we remove @Configuration annotation?

What is Spring Data?

Spring Data is a high level SpringSource project whose purpose is to unify and ease the access to different kinds of persistence stores, both relational database systems and NoSQL data stores.

What is the use of Spring Security?

Spring Security is a framework that enables a programmer to impose security restrictions to Spring-framework–based Web applications through JEE components. In short, it is a library that can be used, extended to customize as per the programmer’s needs.

What is difference between @component and @service?

@Component is a generic stereotype for any Spring-managed component or bean. @Repository is a stereotype for the persistence layer. @Service is a stereotype for the service layer. @Controller is a stereotype for the presentation layer (spring-MVC).

What is a spring data repository?

Working with Spring Data Repositories. The goal of Spring Data repository abstraction is to significantly reduce the amount of boilerplate code required to implement data access layers for various persistence stores. It uses the configuration and code samples for the Java Persistence API (JPA) module. …

What is difference between @repository and @service?

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.

Can we Autowire POJO class?

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 @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.

How does Spring Data Work?

The Spring Data JPA framework can then inspect that contract, and automatically build the interface implementation under the covers for you. For Spring Data JPA to intelligently generate an implementation of your Repository interface, a Query DSL is needed. DSL is an acronym for Domain Specific Language.

What is use of @autowired in spring?

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 @component?

@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. @Service , @Repository , and @Controller are specializations of @Component , which are used for more specific cases.