{"id":3374,"date":"2026-08-06T13:13:33","date_gmt":"2026-08-06T12:13:33","guid":{"rendered":"https:\/\/codeflarelimited.com\/blog\/?p=3374"},"modified":"2026-08-06T13:13:41","modified_gmt":"2026-08-06T12:13:41","slug":"how-to-create-rest-apis-in-java-spring-boot","status":"publish","type":"post","link":"https:\/\/codeflarelimited.com\/blog\/how-to-create-rest-apis-in-java-spring-boot\/","title":{"rendered":"How to Create REST APIs in Java Spring Boot"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Spring Boot is one of the most popular frameworks for building REST APIs in Java. It removes most of the configuration required by traditional Spring applications, allowing you to build APIs quickly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By the end of this guide, you&#8217;ll know how to create a simple CRUD API.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">What is an API?<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">An&nbsp;<strong>Application Programming Interface (API)<\/strong>&nbsp;allows two applications to communicate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A React website requests user data.<\/li>\n\n\n\n<li>A Spring Boot API processes the request.<\/li>\n\n\n\n<li>The API returns JSON.<\/li>\n\n\n\n<li>React displays the information.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">React App\n     \u2502\nHTTP Request\n     \u2502\n     \u25bc\nSpring Boot API\n     \u2502\nBusiness Logic\n     \u2502\n     \u25bc\nDatabase\n<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 1: Create a Spring Boot Project<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Go to&nbsp;<strong>Spring Initializr<\/strong>&nbsp;and create a new project.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choose:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Project: Maven<\/li>\n\n\n\n<li>Language: Java<\/li>\n\n\n\n<li>Spring Boot: Latest Stable<\/li>\n\n\n\n<li>Packaging: Jar<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Dependencies:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spring Web<\/li>\n\n\n\n<li>Spring Data JPA<\/li>\n\n\n\n<li>MySQL Driver (or PostgreSQL)<\/li>\n\n\n\n<li>Lombok (optional)<\/li>\n\n\n\n<li>Validation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Generate and open it in IntelliJ or VS Code.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Project Structure<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">src\n \u2514\u2500\u2500 main\n      \u251c\u2500\u2500 java\n      \u2502      \u2514\u2500\u2500 com.example.demo\n      \u2502             \u251c\u2500\u2500 controller\n      \u2502             \u251c\u2500\u2500 service\n      \u2502             \u251c\u2500\u2500 repository\n      \u2502             \u251c\u2500\u2500 entity\n      \u2502             \u2514\u2500\u2500 DemoApplication.java\n      \u2502\n      \u2514\u2500\u2500 resources\n             \u2514\u2500\u2500 application.properties\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Each folder has a specific responsibility.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Step 2: Configure the Database<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Example for MySQL:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">spring.datasource.url=jdbc:mysql:\/\/localhost:3306\/demo\nspring.datasource.username=root\nspring.datasource.password=password\n\nspring.jpa.hibernate.ddl-auto=update\nspring.jpa.show-sql=true\n<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 3: Create an Entity<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Suppose we&#8217;re building a Student API.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">package com.example.demo.entity;\n\nimport jakarta.persistence.*;\n\n@Entity\npublic class Student {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;\n\n    private String name;\n\n    private String email;\n\n    \/\/ getters and setters\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This class becomes a database table.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Step 4: Create the Repository<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Repositories communicate with the database.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">package com.example.demo.repository;\n\nimport com.example.demo.entity.Student;\nimport org.springframework.data.jpa.repository.JpaRepository;\n\npublic interface StudentRepository\n        extends JpaRepository&lt;Student, Long&gt; {\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Notice there is almost no code.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring automatically creates methods like:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>save()<\/li>\n\n\n\n<li>findAll()<\/li>\n\n\n\n<li>findById()<\/li>\n\n\n\n<li>deleteById()<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Step 5: Create the Service<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">The service contains business logic.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">package com.example.demo.service;\n\nimport com.example.demo.entity.Student;\nimport com.example.demo.repository.StudentRepository;\nimport org.springframework.stereotype.Service;\n\nimport java.util.List;\n\n@Service\npublic class StudentService {\n\n    private final StudentRepository repository;\n\n    public StudentService(StudentRepository repository) {\n        this.repository = repository;\n    }\n\n    public List&lt;Student&gt; getStudents() {\n        return repository.findAll();\n    }\n\n    public Student addStudent(Student student) {\n        return repository.save(student);\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The service sits between the controller and repository.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">Controller\n     \u2502\n     \u25bc\nService\n     \u2502\n     \u25bc\nRepository\n     \u2502\n     \u25bc\nDatabase\n<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Step 6: Create the Controller<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Controllers receive HTTP requests.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">package com.example.demo.controller;\n\nimport com.example.demo.entity.Student;\nimport com.example.demo.service.StudentService;\nimport org.springframework.web.bind.annotation.*;\n\nimport java.util.List;\n\n@RestController\n@RequestMapping(\"\/students\")\npublic class StudentController {\n\n    private final StudentService service;\n\n    public StudentController(StudentService service) {\n        this.service = service;\n    }\n\n    @GetMapping\n    public List&lt;Student&gt; getStudents() {\n        return service.getStudents();\n    }\n\n    @PostMapping\n    public Student createStudent(\n            @RequestBody Student student) {\n\n        return service.addStudent(student);\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now your API is live.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Understanding the Annotations<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">@RestController<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Marks the class as a REST controller.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">@RestController\npublic class StudentController<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Instead of returning HTML, it returns JSON.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">@RequestMapping<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Defines the base URL.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">@RequestMapping(\"\/students\")<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">All routes begin with:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">\/students<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">@GetMapping<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Handles GET requests.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">@GetMapping\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">GET \/students\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Returns:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">[\n  {\n    \"id\":1,\n    \"name\":\"John\",\n    \"email\":\"john@gmail.com\"\n  }\n]\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">@PostMapping<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Handles POST requests.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">@PostMapping<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">POST \/students<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Body:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">{\n    \"name\":\"Jane\",\n    \"email\":\"jane@gmail.com\"\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">@RequestBody<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Converts incoming JSON into a Java object.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Incoming JSON:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">{\n  \"name\":\"Mike\",\n  \"email\":\"mike@gmail.com\"\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Automatically becomes:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">Student student<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Testing the API<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Postman<\/li>\n\n\n\n<li>Insomnia<\/li>\n\n\n\n<li>Bruno<\/li>\n\n\n\n<li>VS Code REST Client<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Example request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">GET http:\/\/localhost:8080\/students<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">POST request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">POST http:\/\/localhost:8080\/students<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Body:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">{\n    \"name\":\"Sarah\",\n    \"email\":\"sarah@gmail.com\"\n}<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Add Update API<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Service:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">public Student update(Long id, Student student){\n\n    Student existing = repository.findById(id)\n            .orElseThrow();\n\n    existing.setName(student.getName());\n    existing.setEmail(student.getEmail());\n\n    return repository.save(existing);\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Controller:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">@PutMapping(\"\/{id}\")\npublic Student updateStudent(\n        @PathVariable Long id,\n        @RequestBody Student student){\n\n    return service.update(id, student);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">PUT \/students\/1<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Body:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">{\n    \"name\":\"James\",\n    \"email\":\"james@gmail.com\"\n}<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Delete API<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Service:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">public void delete(Long id){\n    repository.deleteById(id);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Controller:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">@DeleteMapping(\"\/{id}\")\npublic void deleteStudent(\n        @PathVariable Long id){\n\n    service.delete(id);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">DELETE \/students\/1<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Get Single Student<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Service:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">public Student getStudent(Long id){\n    return repository.findById(id)\n            .orElseThrow();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Controller:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">@GetMapping(\"\/{id}\")\npublic Student getStudent(\n        @PathVariable Long id){\n\n    return service.getStudent(id);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Request:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">GET \/students\/1<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Understanding HTTP Methods<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Method<\/th><th>Purpose<\/th><th>Example<\/th><\/tr><\/thead><tbody><tr><td>GET<\/td><td>Retrieve data<\/td><td>Get all students<\/td><\/tr><tr><td>POST<\/td><td>Create data<\/td><td>Add student<\/td><\/tr><tr><td>PUT<\/td><td>Replace\/update data<\/td><td>Update student<\/td><\/tr><tr><td>PATCH<\/td><td>Partially update data<\/td><td>Update only email<\/td><\/tr><tr><td>DELETE<\/td><td>Remove data<\/td><td>Delete student<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">Common Annotations You&#8217;ll Use<\/h1>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Annotation<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td>@RestController<\/td><td>Creates REST controller<\/td><\/tr><tr><td>@RequestMapping<\/td><td>Base route<\/td><\/tr><tr><td>@GetMapping<\/td><td>GET endpoint<\/td><\/tr><tr><td>@PostMapping<\/td><td>POST endpoint<\/td><\/tr><tr><td>@PutMapping<\/td><td>PUT endpoint<\/td><\/tr><tr><td>@DeleteMapping<\/td><td>DELETE endpoint<\/td><\/tr><tr><td>@RequestBody<\/td><td>Reads JSON body<\/td><\/tr><tr><td>@PathVariable<\/td><td>Reads URL parameter<\/td><\/tr><tr><td>@RequestParam<\/td><td>Reads query parameter<\/td><\/tr><tr><td>@Autowired<\/td><td>Injects dependencies (constructor injection is generally preferred)<\/td><\/tr><tr><td>@Service<\/td><td>Business logic<\/td><\/tr><tr><td>@Repository<\/td><td>Database layer<\/td><\/tr><tr><td>@Entity<\/td><td>Database table<\/td><\/tr><tr><td>@Id<\/td><td>Primary key<\/td><\/tr><tr><td>@GeneratedValue<\/td><td>Auto-generated ID<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">Example API Flow<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">When a client requests&nbsp;<code>GET \/students<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">Client\n   \u2502\n   \u25bc\nGET \/students\n   \u2502\n   \u25bc\nStudentController\n   \u2502\ncalls\n   \u25bc\nStudentService\n   \u2502\ncalls\n   \u25bc\nStudentRepository\n   \u2502\nqueries\n   \u25bc\nMySQL Database\n   \u2502\nreturns data\n   \u25bc\nRepository\n   \u25bc\nService\n   \u25bc\nController\n   \u25bc\nJSON Response\n<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\">Best Practices<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Keep controllers thin; place business logic in services.<\/li>\n\n\n\n<li>Use constructor injection instead of field injection (<code>@Autowired<\/code>) for better testability.<\/li>\n\n\n\n<li>Validate input with&nbsp;<code>@Valid<\/code>&nbsp;and Jakarta Validation annotations like&nbsp;<code>@NotBlank<\/code>&nbsp;and&nbsp;<code>@Email<\/code>.<\/li>\n\n\n\n<li>Return appropriate HTTP status codes (<code>200 OK<\/code>,&nbsp;<code>201 Created<\/code>,&nbsp;<code>204 No Content<\/code>,&nbsp;<code>400 Bad Request<\/code>,&nbsp;<code>404 Not Found<\/code>).<\/li>\n\n\n\n<li>Handle exceptions globally using&nbsp;<code>@ControllerAdvice<\/code>&nbsp;for consistent error responses.<\/li>\n\n\n\n<li>Use DTOs (Data Transfer Objects) instead of exposing entity classes directly in larger applications.<\/li>\n\n\n\n<li>Document your API with Swagger\/OpenAPI.<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\">Typical Spring Boot API Architecture<\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"java\" class=\"language-java\">               HTTP Request\n                     \u2502\n                     \u25bc\n             StudentController\n                     \u2502\n                     \u25bc\n              StudentService\n                     \u2502\n                     \u25bc\n            StudentRepository\n                     \u2502\n                     \u25bc\n              MySQL Database\n                     \u2502\n                     \u25bc\n              JSON Response\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">This layered architecture keeps responsibilities separate: the&nbsp;<strong>Controller<\/strong>&nbsp;handles HTTP requests and responses, the&nbsp;<strong>Service<\/strong>&nbsp;contains business rules, the&nbsp;<strong>Repository<\/strong>&nbsp;manages database access, and the&nbsp;<strong>Entity<\/strong>&nbsp;maps Java objects to database tables. As your application grows, you can add DTOs, validation, security (Spring Security), and API documentation without changing this overall structure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Spring Boot is one of the most popular frameworks for building REST APIs in Java. 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