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Complete Code Example

/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.in28minutes.springboot.rest.example</groupId>
	<artifactId>spring-boot-2-rest-service-basic</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>spring-boot-2-rest-service</name>
	<description>Spring Boot 2 and REST - Example Project</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>


</project>

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/src/main/java/com/in28minutes/springboot/rest/example/SpringBoot2RestServiceApplication.java

package com.in28minutes.springboot.rest.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBoot2RestServiceApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringBoot2RestServiceApplication.class, args);
	}
}

---

/src/main/java/com/in28minutes/springboot/rest/example/student/Student.java

package com.in28minutes.springboot.rest.example.student;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Student {
	@Id
	@GeneratedValue
	private Long id;
	private String name;
	private String passportNumber;
	
	public Student() {
		super();
	}

	public Student(Long id, String name, String passportNumber) {
		super();
		this.id = id;
		this.name = name;
		this.passportNumber = passportNumber;
	}
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassportNumber() {
		return passportNumber;
	}
	public void setPassportNumber(String passportNumber) {
		this.passportNumber = passportNumber;
	}
		
}

---

/src/main/java/com/in28minutes/springboot/rest/example/student/StudentNotFoundException.java

package com.in28minutes.springboot.rest.example.student;

public class StudentNotFoundException extends RuntimeException {

	public StudentNotFoundException(String exception) {
		super(exception);
	}

}

---

/src/main/java/com/in28minutes/springboot/rest/example/student/StudentRepository.java

package com.in28minutes.springboot.rest.example.student;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface StudentRepository extends JpaRepository<Student, Long>{

}

---

/src/main/java/com/in28minutes/springboot/rest/example/student/StudentResource.java

package com.in28minutes.springboot.rest.example.student;

import java.net.URI;
import java.util.List;
import java.util.Optional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

@RestController
public class StudentResource {

	@Autowired
	private StudentRepository studentRepository;

	@GetMapping("/students")
	public List<Student> retrieveAllStudents() {
		return studentRepository.findAll();
	}

	@GetMapping("/students/{id}")
	public Student retrieveStudent(@PathVariable long id) {
		Optional<Student> student = studentRepository.findById(id);

		if (!student.isPresent())
			throw new StudentNotFoundException("id-" + id);

		return student.get();
	}

	@DeleteMapping("/students/{id}")
	public void deleteStudent(@PathVariable long id) {
		studentRepository.deleteById(id);
	}

	@PostMapping("/students")
	public ResponseEntity<Object> createStudent(@RequestBody Student student) {
		Student savedStudent = studentRepository.save(student);

		URI location = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}")
				.buildAndExpand(savedStudent.getId()).toUri();

		return ResponseEntity.created(location).build();

	}
	
	@PutMapping("/students/{id}")
	public ResponseEntity<Object> updateStudent(@RequestBody Student student, @PathVariable long id) {

		Optional<Student> studentOptional = studentRepository.findById(id);

		if (!studentOptional.isPresent())
			return ResponseEntity.notFound().build();

		student.setId(id);
		
		studentRepository.save(student);

		return ResponseEntity.noContent().build();
	}
}

---

/src/main/resources/application.properties

---

/src/main/resources/data.sql

insert into student
values(10001,'Ranga', 'E1234567');

insert into student
values(10002,'Ravi', 'A1234568');

---

/src/test/java/com/in28minutes/springboot/rest/example/SpringBoot2RestServiceApplicationTests.java

package com.in28minutes.springboot.rest.example;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBoot2RestServiceApplicationTests {

	@Test
	public void contextLoads() {
	}

}

---