em.persist nao esta passando os atributos da conta

Ao rodar o codigo CriaConta, esta sendo passado para o banco uma query com valor ? no lugar do valor dos atributos, e nao esta aparecendo no banco

Saida do codigo:

jan 18, 2021 1:52:05 AM org.hibernate.jpa.internal.util.LogHelper logPersistenceUnitInformation
INFO: HHH000204: Processing PersistenceUnitInfo [name: contas]
jan 18, 2021 1:52:05 AM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate ORM core version 5.4.27.Final
jan 18, 2021 1:52:05 AM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
jan 18, 2021 1:52:05 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
jan 18, 2021 1:52:05 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost/alura_jpa?serverTimezone=UTC]
jan 18, 2021 1:52:05 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {password=****, user=root}
jan 18, 2021 1:52:05 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
jan 18, 2021 1:52:05 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
jan 18, 2021 1:52:05 AM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQL57InnoDBDialect
jan 18, 2021 1:52:06 AM org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl getIsolatedConnection
INFO: HHH10001501: Connection obtained from JdbcConnectionAccess [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess@4397a639] for (non-JTA) DDL execution was not in auto-commit mode; the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.
jan 18, 2021 1:52:06 AM org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator initiateService
INFO: HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
Leonardo
1234
4321
Hibernate: 
    insert 
    into
        Conta
        (agencia, numero, titular) 
    values
        (?, ?, ?)

Process finished with exit code 0

import modelo.Conta;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class CriaConta {
    public static void main(String[] args) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("contas");
        EntityManager em = emf.createEntityManager();

        Conta conta = new Conta();
        conta.setTitular("Leonardo");
        conta.setNumero(1234);
        conta.setAgencia(4321);

        System.out.println(conta.getTitular());
        System.out.println(conta.getNumero());
        System.out.println(conta.getAgencia());

        em.getTransaction().begin();
        em.persist(conta);
        em.getTransaction().commit();
    }
}