How to create an rest api in java?

You can create a REST API in Java using Spring Boot. Create a new Spring Boot project, add spring-boot-starter-web dependency, and define a controller with @RestController and mapping annotations like @GetMapping or @PostMapping.

For lightweight APIs, you can use JAX-RS with Jersey. Annotate your resource classes with @Path, @GET, and @Produces for REST endpoints.

@RestController@RequestMapping("/api")public class MyController {    @GetMapping("/hello")    public String sayHello() {        return "Hello World";    }}

Example:

For a full tutorial, visit Baeldung’s REST with Spring guide.

Ensure you handle exceptions properly and define appropriate HTTP status codes for different responses. Security can be added with Spring Security or JWT authentication.

After coding, you can run the application on an embedded Tomcat server or any servlet container. Testing can be done with tools like Postman or cURL.