Spring boot WebFlux: Initialize mongodb with default data

Step 1: Create Employee entity class.

Employee.java

package com.sample.app.entity;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document
public class Employee {

 @Id
 private String id;
 
 private String firstName;

 private String lastName;

 public Employee() {
 }

 public Employee(String firstName, String lastName) {
  this.firstName = firstName;
  this.lastName = lastName;
 }

 public String getFirstName() {
  return firstName;
 }

 public String getId() {
  return id;
 }

 public String getLastName() {
  return lastName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public void setId(String id) {
  this.id = id;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 @Override
 public String toString() {
  StringBuilder builder = new StringBuilder();
  builder.append("Employee [id=").append(id).append(", firstName=").append(firstName).append(", lastName=")
    .append(lastName).append("]");
  return builder.toString();
 }

}

Step 2: Create EmployeeRepository interface by extending ReactiveMongoRepository interface.

EmployeeRepository.java

package com.sample.app.repository;

import org.springframework.data.mongodb.repository.ReactiveMongoRepository;
import org.springframework.stereotype.Repository;

import com.sample.app.entity.Employee;

import reactor.core.publisher.Flux;

@Repository
public interface EmployeeRepository extends ReactiveMongoRepository<Employee, String> {

 public Flux<Employee> findByFirstName(String firstName);
}

Step 3: Create App.java.

App.java

package com.sample.app;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

import com.sample.app.entity.Employee;
import com.sample.app.repository.EmployeeRepository;

import reactor.core.publisher.Flux;

@SpringBootApplication
public class App {
 public static void main(String[] args) {

  SpringApplication.run(App.class, args);
 }

 @Bean
 public CommandLineRunner demo(EmployeeRepository empRepository) {
  return (args) -> {
   Employee emp1 = new Employee("Phalgun", "Garimella");
   Employee emp2 = new Employee("Sankalp", "Dubey");
   Employee emp3 = new Employee("Arpan", "Debroy");

   Flux<Employee> empsFlux = Flux.just(emp1, emp2, emp3);

   empsFlux.map(emp -> empRepository.save(emp))
     .subscribe(result -> System.out.println("Created employee : " + result.block()));

   System.out.println("\nGetting all the employees from database\n");
   empRepository.findAll().subscribe(System.out::println);

  };
 }
}

pom.xml

<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>springWebflux</groupId>
 <artifactId>springWebflux</artifactId>
 <version>1</version>

 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.6.RELEASE</version>
 </parent>


 <dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-webflux</artifactId>
  </dependency>

  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
  </dependency>


  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
  </dependency>

  <dependency>
   <groupId>de.flapdoodle.embed</groupId>
   <artifactId>de.flapdoodle.embed.mongo</artifactId>
   <!-- <scope>test</scope> -->
  </dependency>


 </dependencies>
</project>

Total project structure looks like below.

Run App.java, you can see below messages in console.

Created employee : Employee [id=5d4bdff6b0eb2a9a2b63261c, firstName=Phalgun, lastName=Garimella]
Created employee : Employee [id=5d4bdff6b0eb2a9a2b63261d, firstName=Sankalp, lastName=Dubey]
Created employee : Employee [id=5d4bdff6b0eb2a9a2b63261e, firstName=Arpan, lastName=Debroy]

Getting all the employees from database

Employee [id=5d4bdff6b0eb2a9a2b63261c, firstName=Phalgun, lastName=Garimella]
Employee [id=5d4bdff6b0eb2a9a2b63261d, firstName=Sankalp, lastName=Dubey]
Employee [id=5d4bdff6b0eb2a9a2b63261e, firstName=Arpan, lastName=Debroy]

You can download complete working application from this link.

    

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