Field dao in com.car.services.CarServices required a bean of type 'javax.persistence.EntityManagerFactory' that could not be found

Im trying to learn spring-boot basic application and unable to solve this error

APPLICATION FAILED TO START

Description:

Field dao in com.car.services.CarServices required a bean of type 'javax.persistence.EntityManagerFactory' that could not be found.

The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)

Action:

Consider defining a bean of type 'javax.persistence.EntityManagerFactory' in your configuration.

repository file

@SuppressWarnings("unused")
@Transactional
@Repository
public class CarDAO implements ICarDAO {
	
	@PersistenceContext
	private EntityManager entityManager;

	@SuppressWarnings("unchecked")
	@Override
	public List<Car> getCars() {
		//String hql = "FROM Car ";
		String hql = "FROM Car as a ORDER BY a.id DESC";
		return (List<Car>) entityManager.createQuery(hql).getResultList();
	}

	@Override
	public Car getCar(int carId) {
		return entityManager.find(Car.class, carId);
	}

}

my 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 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>2.7.8</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.car</groupId>
	<artifactId>car</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>car-demo</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<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>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>javax.persistence</groupId>
			<artifactId>javax.persistence-api</artifactId>
			<version>2.2</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
			<version>2.7.8</version>
		</dependency>
		<dependency>
			<groupId>com.mysql</groupId>
			<artifactId>mysql-connector-j</artifactId>
			<version>8.0.32</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

service file

@Service
public class CarServices implements ICarServices {
	
	@Autowired
	private ICarDAO dao;

	@Override
	public List<Car> getCars() {
		return dao.getCars();
	}

	@Override
	public Car getCars(int carId) {
		return dao.getCar(carId);
	}
	

}

Controller file

@RestController
@RequestMapping("carservice")
public class CarController {
	
	
	@Autowired
	private ICarServices service;
	
	@GetMapping("car")
	public ResponseEntity<List<Car>> getCars(){
		
		List<Car> cars = service.getCars();
		return new ResponseEntity<List<Car>>(cars, HttpStatus.OK);
		
	}

}

main function

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class CarDemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(CarDemoApplication.class, args);
		System.out.println("hello from car");
	}

}

application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/cardb
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.tomcat.max-wait=20000
spring.datasource.tomcat.max-active=50
spring.datasource.tomcat.max-idle=20
spring.datasource.tomcat.min-idle=15

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect
spring.jpa.properties.hibernate.id.new_generator_mappings = false
spring.jpa.properties.hibernate.format_sql = true

logging.level.org.hibernate.SQL=DEBUG
logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE

I tried
import org.springframework.beans.factory.annotation.Autowired;
in my repository.java file but it didnt work for me.

You need to remove DataSourceAutoConfiguration.class from exclusions. That is what sets up the EntityManagerFactory.

So this:

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
// Main class definition

Should be:

@SpringBootApplication()
// Main class definition