React.js and Spring Data REST: Part 1 - Basic Features
| To see updates to this code, visit our React.js and Spring Data REST tutorial. |
Welcome Spring community,
This is the first of several blog entries. In this session, you will see how to get a bare-bones Spring Data REST application up and running quickly. Then you will build a simple UI on top of it using Facebook’s React.js toolset.
Step 0 - Setting up your environment
Feel free to grab the code from this repository and follow along.
If you want to do it yourself, visit http://start.spring.io and pick these items:
- Rest Repositories
- Thymeleaf
- JPA
- H2
This demo uses Java 8, Maven Project, and the latest stable release of Spring Boot. This will give you a clean, empty project. From there, you can add the various files shown explicitly in this session, and/or borrow from the repository listed above.
In the beginning…
In the beginning there was data. And it was good. But then people wanted to access the data through various means. Over the years, people cobbled together lots of MVC controllers, many using Spring’s powerful REST support. But doing over and over cost a lot of time.
Spring Data REST addresses how simple this problem can be if some assumptions are made:
- The developer uses a Spring Data project that supports the repository model.
- The system uses well accepted, industry standard protocols, like HTTP verbs, standardized media types, and IANA-approved link names.
Declaring your domain
The cornerstone of any Spring Data REST-based application are the domain objects. For this session, you will build an application to track the employees for a company. Kick that off by creating a data type like this:
@Data
@Entity
public class Employee {
private @Id @GeneratedValue Long id;
private String firstName;
private String lastName;
private String description;
private Employee() {}
public Employee(String firstName, String lastName, String description) {
this.firstName = firstName;
this.lastName = lastName;
this.description = description;
}
}
-
@Entityis a JPA annotation that denotes the whole class for storage in a relational table. -
@Idand@GeneratedValueare JPA annotation to note the primary key and that is generated automatically when needed. -
@Dataand@RequiredArgsConstructorare Project Lombok annotations to autogenerate getters, setters, constructors, toString, hash, equals, and other things. It cuts down on the boilerplate.
This entity is used to track employee information. In this case, their name and job description.
|
Note
|
Spring Data REST isn’t confined to JPA. It supports many NoSQL data stores, but you won’t be covering those here. |
Defining the repository
Another key piece of a Spring Data REST application is to create a corresponding repository definition.
public interface EmployeeRepository extends CrudRepository<Employee, Long> {
}
-
The repository extends Spring Data Commons'
CrudRepositoryand plugs in the type of the domain object and its primary key
That is all that is needed! In fact, you don’t even have to annotate this invisible if its top-level and visible. If you use your IDE and open up CrudRepository, you’ll find a fist full of pre-built methods already defined.
|
Note
|
You can define your own repository if you wish. Spring Data REST supports that as well. |
Pre-loading the demo
To work this this application, you need to pre-load it with some data like this:
@Component
public class DatabaseLoader implements CommandLineRunner {
private final EmployeeRepository repository;
@Autowired
public DatabaseLoader(EmployeeRepository repository) {
this.repository = repository;
}
@Override
public void run(String... strings) throws Exception {
this…
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Abstract
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Introduction
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