<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/teste"/>

<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/teste?useLegacyDatetimeCode=false&serverTimezone=America/Sao_Paulo"/>

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>5.2.9.Final</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>6.0.6</version>
</dependency>

<property name="hibernate.hbm2ddl.auto" value="create-drop"/>

<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>

<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL57InnoDBDialect"/>

List<Empregado> empregados = (List<Empregado>) em.createQuery("FROM Empregado").getResultList();

List<Empregado> empregados = em.createQuery("SELECT e FROM Empregado e", Empregado.class).getResultList();

<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/teste?useLegacyDatetimeCode=false&serverTimezone=America/Sao_Paulo"/>