spring.datasource.url=jdbc:mysql://localhost:3306/springbootfirstapp
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=update

package springbootfirstapp.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import springbootfirstapp.domain.Customer;
import springbootfirstapp.repo.CustomerRepo;

@RestController
@RequestMapping("/customer")
public class CustomerController {


@Autowired
CustomerRepo rp;

@RequestMapping("/findall")
@ResponseBody
public List<Customer> findall(){
return rp.findAll();
    }



}

package springbootfirstapp.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Customer {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;
private int phone;
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public int getPhone() {
    return phone;
}
public void setPhone(int phone) {
    this.phone = phone;
}
public Customer(int id, String name, int phone) {
    super();
    this.id = id;
    this.name = name;
    this.phone = phone;
}
public Customer() {
    super();
}





}

package springbootfirstapp.repo;

import org.springframework.data.jpa.repository.JpaRepository;

import springbootfirstapp.domain.Customer;

public interface CustomerRepo extends JpaRepository<Customer, Integer> {

}

spring.datasource.url=jdbc:mysql://localhost:3306/springbootfirstapp
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=update