How can we create Auto generated field or ID for mongodb using spring boot

😂 How can we create an Auto-generated field or ID for MongoDB using spring boot?

First Create One Application Like Mongodb_sequence-id-generator

Pom.XML

User.java

package com.app;
import org.springframework.data.annotation.Id;
import org.springframework.data.annotation.Transient;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection = "users_db")
public class User {

@Transient
    public static final String SEQUENCE_NAME = "users_sequence";

@Id
    private long id;

private String firstName;

private String lastName;

private String email;

public User() { }

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

public long getId() {
        return id;
    }

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

public String getFirstName() {
        return firstName;
    }

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

public String getLastName() {
        return lastName;
    }

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

public String getEmail() {
        return email;
    }

public void setEmail(String email) {
        this.email = email;
    }
    
    @Override
    public String toString() {
        return "User{" + "id=" + id + ", firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' + ", email='" + email + '\'' + '}';
    }
}

DatabaseSequence.java

UserRepositery.java

SequenceGeneratorService.java

package com.app;

import static org.springframework.data.mongodb.core.query.Query.query;
import java.util.Objects;
import static org.springframework.data.mongodb.core.FindAndModifyOptions.options;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.data.mongodb.core.MongoOperations;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.stereotype.Service;
import static org.springframework.data.mongodb.core.query.Criteria.where;
@Service
public class SequenceGeneratorService {

@Autowired
    private  MongoOperations mongoOperations;

@Autowired
    public SequenceGeneratorService(MongoOperations mongoOperations) {
        this.mongoOperations = mongoOperations;
    }

public  long generateSequence(String seqName) {

DatabaseSequence counter = mongoOperations.findAndModify(query(where("_id").is(seqName)),
                new Update().inc("seq",1), options().returnNew(true).upsert(true),
                DatabaseSequence.class);
        return !Objects.isNull(counter) ? counter.getSeq() : 1;

}

MongodbSequenceIdGenerator1Application: This do work like Controller Best of luck

package com.app;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Repository;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class MongodbSequenceIdGenerator1Application {

@Autowired
	private UserRepositery repository;
	
	@Autowired
	private SequenceGeneratorService sequenceGeneratorService;
	
	@PostMapping("/save")
	public User saveUser(@RequestBody User user) {
		
		//set Id
		user.setId(sequenceGeneratorService.generateSequence(User.SEQUENCE_NAME));
		return repository.save(user);
		
	}
	@GetMapping("/select")
	public List<User> getUser() {
		
		return repository.findAll();
		
	}
	
	public static void main(String[] args) {
		SpringApplication.run(MongodbSequenceIdGenerator1Application.class, args);
	    System.out.println("Project is started");
	}

}

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