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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →To build a basic JSON endpoint with Spring Boot, generate a project that includes Spring Web, add a controller method for an HTTP request, and run the application locally. This guide walks through that path, then explains what the small example does not provide: persistent storage, production safeguards, or by itself the full REST architectural style.
What you need before you start
Spring’s starter guide lists Java 17 or later and either Maven 3.5+ or Gradle 7.5+ as prerequisites. Check the compatibility requirements for the Spring Boot release you select in Initializr; those baseline versions do not guarantee that every newer release supports every older toolchain. The official guide is at Building a RESTful Web Service.
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Use Maven or Gradle according to the conventions and workflow you already use. Both are supported by the starter guide; there is no universally better choice for this small service.
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Generate a Spring Boot project
- Open Spring Initializr and choose a project type, language Java, and a Spring Boot release compatible with your installed Java and build tool.
- Set the project’s group, artifact, and package details to suit your application.
- Add the Spring Web dependency, then generate and extract the project.
- Open the project in your IDE. Keep the generated build files and application entry point; the entry point is where the example starts.
The starter guide’s project uses @SpringBootApplication on its main application class. In this example, that annotation brings together configuration, auto-configuration, and component scanning. It is a convenient starting point, not a substitute for understanding how your application is organized as it grows.
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Add a controller and a JSON representation
In Spring’s approach, an annotated controller handles HTTP requests. A @RestController marks a class as a request handler whose returned values are written to the response body. When a method returns a Java object and the web configuration supports JSON, Spring serializes that object as a JSON representation.
The official greeting example separates the representation from the request-handling method. A simplified version looks like this:
public record Greeting(long id, String content) {}@RestController
class GreetingController {
private final AtomicLong counter = new AtomicLong();
@GetMapping("/greeting")
Greeting greeting(@RequestParam(defaultValue = "World") String name) {
return new Greeting(counter.incrementAndGet(), "Hello, " + name + "!");
}
}Here, Greeting is the response representation; the controller maps an HTTP GET request to /greeting to a Java method. The optional name query parameter supplies the greeting name, with World used when it is omitted. The counter makes requests easy to distinguish while demonstrating a changing response. Use the exact class and package names that match your generated project, and follow the official tutorial if you want its complete runnable files: Spring’s REST service guide.
Run the application and inspect the endpoint
Run the generated application from your IDE, or use the project’s Maven or Gradle wrapper from a terminal. For a generated Maven project, a common command is ./mvnw spring-boot:run; for a generated Gradle project, use ./gradlew bootRun. On Windows, the wrapper scripts are typically mvnw.cmd and gradlew.bat. The exact tasks can depend on the generated project and selected build configuration.
Once the application reports that it has started, request the endpoint locally:
curl "http://localhost:8080/greeting?name=Ada"If the default server port is unchanged and the example is running, the response is JSON with the greeting’s fields, such as {"id":1,"content":"Hello, Ada!"}. The ID may differ between requests because the sample counter increments. A browser can also open the URL for this simple GET request. Spring’s starter guide includes the full run-and-check flow at spring.io/guides/gs/rest-service.
Know what the greeting example does—and does not—store
The counter-backed greeting is a teaching example, not durable domain storage. Its changing ID comes from in-memory application state; it is not a database record. A restart does not turn that counter into a persistent identifier scheme, and the example does not demonstrate concurrent-safe business workflows, validation, or error contracts.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsFor a data-backed expansion, Spring’s broader tutorial builds an employee service with Spring Data JPA and an H2 in-memory database. That is a separate step from returning a Java object as JSON: persistence introduces a data model and repository layer, while H2 in-memory data is not a substitute for choosing and configuring production storage. See Building REST services with Spring.
Best Value
HTTP operations are not the whole REST architectural style
A service can expose resource-shaped URLs and use HTTP GET, POST, PUT, and DELETE for CRUD operations without satisfying all of REST’s architectural constraints. Spring’s broader tutorial explicitly cautions that attractive URLs, HTTP verbs, and CRUD alone are not enough. The distinction matters when clients need to navigate the API and evolve without being tightly coupled to its internal URL layout.
The broader tutorial expands the employee service with Spring HATEOAS links and resource relations, and discusses compatibility practices. Hypermedia links can let a response describe relevant next actions or related resources, rather than requiring a client to hard-code every route. Whether that depth is needed depends on the API’s goals and client contract; it should be a deliberate design decision, not a label inferred from JSON plus CRUD endpoints. Read the tutorial at Spring’s REST services tutorial.
Choose the web stack to fit the application
Spring Boot documents both servlet-based Spring MVC and reactive Spring WebFlux, along with embedded server choices including Tomcat, Jetty, and Netty. These are architectural and runtime choices, not merely interchangeable syntax. Select the stack that fits the application’s execution model, programming style, and requirements; the documentation does not establish a universal winner. Review the current options in the Spring Boot web reference.
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A local response proves that the request path and basic serialization work. Before treating an API as ready for real clients, decide how it will handle the concerns below; the starter greeting tutorial is not a complete implementation recipe for them.
Quick Recap
- Persistence: choose a durable data store and model the repository and transaction boundaries rather than relying on a demonstration counter.
- Validation and errors: define accepted inputs, validation rules, status codes, and a consistent error response.
- Security: determine authentication, authorization, and transport requirements for the API’s users and deployment environment.
- Testing: cover controller behavior, domain logic, and persistence boundaries with tests appropriate to the application.
- API documentation and compatibility: make the contract understandable to clients and plan how changes will be introduced without surprising them.
- Deployment: configure the target environment, operational monitoring, and release process. Spring Boot supports executable applications, but framework capabilities do not mean every production feature is configured or secure by default; see the Spring Boot overview.
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