Error: "org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name..." in Spring

I try to build microservices with Spring Boot 3.0.2 and Spring cloud. I try to build one Microservice that connects to a Postgres database running on docker. I get the following errors:

> org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'customerController' defined in file [/Users/.../customer/CustomerController.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'customerService' defined in file [/Users/...customer/CustomerService.class]: Unsatisfied dependency expressed through constructor parameter 0: Error creating bean with name 'customerRepository' defined in com.ioannispriovolos.customer.CustomerRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Not a managed type: class com.ioannispriovolos.customer.Customer

> Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.ioannispriovolos.customer.Customer

I searched a lot for similar questions in stack overflow but none gave me the solution. I provide the customerController.

package com.ioannispriovolos.customer;

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Slf4j
@RestController
@RequestMapping("api/v1/customers")
public record CustomerController (CustomerService customerService){

    @PostMapping
    public void registerCustomer(@RequestBody CustomerRegistrationRequest customerRegistrationRequest) {
        log.info("new customer registration {}", customerRegistrationRequest);
        customerService.registerCustomer(customerRegistrationRequest);
    }
}

If you need more code from my side please inform me and I will edit the question.
I provide the Customer class after mentioned in the comments.

package com.ioannispriovolos.customer;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
public class Customer {
    @Id
    @SequenceGenerator(
            name = "customer_id_sequence",
            sequenceName = "customer_id_sequence"
    )
    @GeneratedValue(
            strategy = GenerationType.SEQUENCE,
            generator = "customer_id_sequence"
    )
    private Integer id;
    private String firstName;
    private String lastname;
    private String email;
}

Spring Boot JPA module as a part of the Spring Boot 3 release turned to work with Jakarta Persistence API rather than with javax.persistence.api. This is the reason why @EntityScan does not find the entities.

Read the docs

Jakarta Dependency

Add that dependency to your pom and change the imports in your entities

Change import javax.persistence.*; to import jakarta.persistence.*;