@PutMapping Spring Boot Example

In this tutorial, we will learn how to use Spring boot provided @PutMapping annotation with an example.

Before understanding about @PutMapping annotation, let's first understand what is PUT HTTP method? 

What is PUT HTTP Method?

PUT HTTP method is used to modify/update a resource where the client sends data that updates the entire resource.

It is used to set an entity’s information completely. PUT is similar to POST in that it can create resources, but it does so when there is a defined URI. PUT overwrites the entire entity if it already exists, and creates a new resource if it doesn’t exist.

@PutMapping Annotation Overview

As we know PUT HTTP method is used to update/modify the resource so the @PutMapping annotation is used for mapping HTTP PUT requests onto specific handler methods.

Specifically, @PutMapping is a composed annotation that acts as a shortcut for @RequestMapping(method = RequestMethod.PUT).
The @PutMapping annotation has below optional attributes:
  • consumes – Narrows the primary mapping by media types that can be consumed by the mapped handler.
  • headers  – The headers of the mapped request, narrowing the primary mapping.
  • name – Assign a name to this mapping.
  • params – The parameters of the mapped request, narrowing the primary mapping.
  • path – The primary mapping expressed by this annotation.
  • produces – Narrows the primary mapping by media types that can be produced by the mapped handler.
  • value – The primary mapping expressed by this annotation.

@PutMapping Annotation Example

    // build update employee REST API
    @PutMapping("{id}")
    public ResponseEntity<Employee> updateEmployee(@PathVariable long id,@RequestBody Employee employeeDetails) {
        Employee updateEmployee = employeeRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException("Employee not exist with id: " + id));

        updateEmployee.setFirstName(employeeDetails.getFirstName());
        updateEmployee.setLastName(employeeDetails.getLastName());
        updateEmployee.setEmailId(employeeDetails.getEmailId());

        employeeRepository.save(updateEmployee);

        return ResponseEntity.ok(updateEmployee);
    }

@PutMapping Annotation Complete Step By Step Example

Let's build a simple Spring Boot project using IntelliJ IDEA to demonstrate the usage of @PutMapping annotation.

We will use Spring Data JPA to develop a repository layer and MySQL database at the backend. We will use the Postman client to test the REST APIs. 

1. Create a Spring boot application

Spring Boot provides a web tool called Spring Initializer to bootstrap an application quickly. Just go to https://start.spring.io/ and generate a new spring boot project.

Use the below details in the Spring boot creation:

Project Name: springboot-backend

Project Type: Maven

Choose dependencies: Spring Web, Lombok, Spring Data JPA, and MySQL Driver

Package name: net.javaguides.springboot

Packaging: Jar

Download the Spring Boot project as a zip file, unzip it, and import it into IntelliJ IDEA.

Here is the pom.xml file for your reference:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.5.5</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>net.javaguides</groupId>
	<artifactId>springboot-backend</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot-backend</name>
	<description>Demo project for Spring Boot REST APIs</description>
	<properties>
		<java.version>11</java.version>
	</properties>
	<dependencies>
		<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>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</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>
				<configuration>
					<excludes>
						<exclude>
							<groupId>org.projectlombok</groupId>
							<artifactId>lombok</artifactId>
						</exclude>
					</excludes>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

2. Create Project or Packaging Structure

You below screenshot to create a project or packaging structure for your Spring boot project:

3. Configure MySQL Database

Since we’re using MySQL as our database, we need to configure the database URLusername, and password so that Spring can establish a connection with the database on startup. Open src/main/resources/application.properties file and add the following properties to it:
spring.datasource.url=jdbc:mysql://localhost:3306/ems?useSSL=false
spring.datasource.username=root
spring.datasource.password=Mysql@123

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect

spring.jpa.hibernate.ddl-auto = update
Don’t forget to change the spring.datasource.username and spring.datasource.password as per your MySQL installation. Also, create a database named ems in MySQL before proceeding to the next section.

You don’t need to create any tables. The tables will automatically be created by Hibernate from the Employee entity that we will define in the next step. This is made possible by the property spring.jpa.hibernate.ddl-auto = update.

4. Create JPA Entity

Go to the model package, create a class named Employee and add the following content into it:
package net.javaguides.springboot.model;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

import javax.persistence.*;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name = "employees")
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @Column(name = "first_name")
    private String firstName;

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "email_id")
    private String emailId;
}

5. Create Spring Data JPA Repository

No, we gonna create a Spring Data JPA repository to talk with the MySQL database.
Go to the repository package, create the following EmployeeRepository interface and add the following content to it:
package net.javaguides.springboot.repository;

import net.javaguides.springboot.model.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

public interface EmployeeRepository extends JpaRepository<Employee, Long> {
    // all crud database methods
}

6. Create ResourceNotFoundException Custom Exception

Go to an exception package, create a class named ResourceNotFoundException and add the following content to it:

package net.javaguides.springboot.exception;

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND)
public class ResourceNotFoundException extends RuntimeException{

    public ResourceNotFoundException(String message){
        super(message);
    }
}

7. Creating Spring Boot CRUD REST APIs

Go to the controller package, create a class named EmployeeController and add the following content to it:

package net.javaguides.springboot.controller;

import net.javaguides.springboot.exception.ResourceNotFoundException;
import net.javaguides.springboot.model.Employee;
import net.javaguides.springboot.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@CrossOrigin("*")
@RestController
@RequestMapping("/api/v1/employees")
public class EmployeeController {

    @Autowired
    private EmployeeRepository employeeRepository;

    // build create employee REST API
    @PostMapping
    public Employee createEmployee(@RequestBody Employee employee) {
        return employeeRepository.save(employee);
    }

    // build update employee REST API
    @PutMapping("{id}")
    public ResponseEntity<Employee> updateEmployee(@PathVariable long id,@RequestBody Employee employeeDetails) {
        Employee updateEmployee = employeeRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException("Employee not exist with id: " + id));

        updateEmployee.setFirstName(employeeDetails.getFirstName());
        updateEmployee.setLastName(employeeDetails.getLastName());
        updateEmployee.setEmailId(employeeDetails.getEmailId());

        employeeRepository.save(updateEmployee);

        return ResponseEntity.ok(updateEmployee);
    }
}
We have built Create Employee REST API to insert an employee into the database and Update Employee REST API to update the existing employee information.

Create Employee REST API:

    // build create employee REST API
    @PostMapping
    public Employee createEmployee(@RequestBody Employee employee) {
        return employeeRepository.save(employee);
    }

Update Employee REST API:

    // build update employee REST API
    @PutMapping("{id}")
    public ResponseEntity<Employee> updateEmployee(@PathVariable long id,@RequestBody Employee employeeDetails) {
        Employee updateEmployee = employeeRepository.findById(id)
                .orElseThrow(() -> new ResourceNotFoundException("Employee not exist with id: " + id));

        updateEmployee.setFirstName(employeeDetails.getFirstName());
        updateEmployee.setLastName(employeeDetails.getLastName());
        updateEmployee.setEmailId(employeeDetails.getEmailId());

        employeeRepository.save(updateEmployee);

        return ResponseEntity.ok(updateEmployee);
    }

8. Running the Application

Let's deploy our Spring boot application in a servlet container(embedded tomcat). 
Two ways we can start the standalone Spring boot application. 

9. Testing CRUD REST APIs using Postman

Test Create Employee REST API:

Let's use Create Employee REST API to insert an employee into the database and then we use Update Employee REST API to update the existing employee information.

Test Update Employee REST API:










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