Criar o banco de dados `fj21_v2`:

```sh
$: mysql -uroot -p

mysql> create database fj21_v2;
```

Colar no arquivo `src/META-INF/persistence.xml` dentro da tag `<persistence>...</persistence>`:
```xml
<persistence-unit name="tarefas">

      <provider>org.hibernate.ejb.HibernatePersistence</provider>
      <class>br.com.caelum.tarefas.modelo.Tarefa</class>
      <properties>
          <property name="javax.persistence.jdbc.driver"
              value="com.mysql.jdbc.Driver" />
          <property name="javax.persistence.jdbc.url"
              value="jdbc:mysql://localhost/fj21_v2" />
          <property name="javax.persistence.jdbc.user" value="root" />
          <property name="javax.persistence.jdbc.password" value="" />

          <property name="hibernate.dialect"
              value="org.hibernate.dialect.MySQL5InnoDBDialect" />
          <property name="hibernate.show_sql" value="true" />
          <property name="hibernate.format_sql" value="true" />
          <property name="hibernate.hbm2ddl.auto" value="update" />
      </properties>
</persistence-unit>
```