JPA is not creating any table

I have an implementation which should create a table in mysql. This is just for testing the function of the code.

But it dosen't and I don't know why, my classes looks like this:

@ManagedBean
@ApplicationScoped
public class Shop {
    private List<Artikel> sortiment = new ArrayList<Artikel>();
    private static Shop instance = new Shop();


    public Shop() {    
    Artikel a = new Artikel();
    a.setId(1);
    a.setName("Samsung");

    EntityManagerFactory factory = Persistence.createEntityManagerFactory("onlineshop");
    EntityManager manager = factory.createEntityManager();
    manager.getTransaction().begin();
    manager.persist(a);
    manager.getTransaction().commit();
    }

}

This Class is my Managed Bean class.

And this one is my Persistence Unit:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 
         xmlns="http://ift.tt/1cKbVbQ" 
         xmlns:xsi="http://ift.tt/ra1lAU" 
         xsi:schemaLocation="http://ift.tt/1cKbVbQ http://ift.tt/1kMb4sd">
<persistence-unit name="onlineshop" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<properties>
  <property name="javax.persistence.jdbc.url" value="jdbc:derby://localhost:1527/onlineshop"/>
  <property name="javax.persistence.jdbc.user" value="benjamin"/>
  <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.ClientDriver"/>
  <property name="javax.persistence.jdbc.password" value="start123"/>
  <property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>
  <property name="javax.persistence.schema-generation.database.action" value="create"/>
  <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
  <property name="hibernate.show_sql" value="true" />
</properties>
 </persistence-unit>
</persistence>

And my Entity-Class look like this:

@Entity
public class Artikel implements Serializable{

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String name;


public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}
}

So as you can see, it's a very small piece of code, but it won't work for me. All necessary libraries are included, also the mysql.jar file.