What Is Spring Data?

What is spring data repository?

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.

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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 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 @configuration and @component in Spring?

@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.

What is the use of 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 @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.

What is the difference between @bean and @autowired?

The @Autowired annotation is used for auto-wiring in Spring framework. … The @Inject annotation also serves the same purpose, but the main difference between them is that @Inject is a standard annotation for dependency injection and @Autowired is spring specific.

What is JPA and Spring Data JPA?

Java Persistence API (JPA) is a specification provided by Java for APIs accessing various SQL databases. … Spring Data JPA is a sub-project of Spring Data and provides abstraction over the Data Access Layer using Java Persistence API and ORM implementations like Hibernate.

What is use of @repository in spring?

@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.

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 the difference between spring JPA and Spring Data JPA?

Hibernate is a JPA implementation, while Spring Data JPA is a JPA Data Access Abstraction. Spring Data offers a solution to GenericDao custom implementations. Remember, Spring Data JPA always requires the JPA provider such as Hibernate or Eclipse Link. …

What is singleton in spring?

Singleton pattern says that one and only one instance of a particular class will ever be created per classloader. The scope of a Spring singleton is described as “per container per bean”. It is the scope of bean definition to a single object instance per Spring IoC container. The default scope in Spring is Singleton.

What is the difference between @service and @component in Spring?

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 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.