ERRO Port 8080 was already in use.

package br.com.alura.mvc.mudi2.controller;

import java.util.Arrays;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import br.com.alura.mvc.mudi2.model.Pedido;
import br.com.alura.mvc.mudi2.repository.PedidoRepository;

@Controller
public class HomeController {

    @Autowired
    private PedidoRepository repository;

    @GetMapping("/home")
    public String home(Model model) {

        List<Pedido> pedidos =repository.recuperaTodosOsPedidos();

        model.addAttribute("pedidos", pedidos);

        return "home";
    }
}

package br.com.alura.mvc.mudi2.repository;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import org.springframework.stereotype.Repository;

import br.com.alura.mvc.mudi2.model.Pedido;

@Repository
public class PedidoRepository {

    @PersistenceContext
    private EntityManager entityManager;

    public List<Pedido> recuperaTodosOsPedidos(){
        Query query = entityManager.createQuery("select p from Pedido p", Pedido.class);
        return query.getResultList();
    }

}

spring.jpa.hibernate.ddl-auto=update
server.port = 8080
spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/mudi2
spring.datasource.username=root
spring.datasource.password=(minhasenha)

Solução para quem se deparar com o mesmo problema é salvar uma porta diferente e reiniciar o computador.