Hibernate 5.2.9.Final terminate

After the execution of the main method, the program does not end.

Googled a lot, but everyone writes only about sessionFactory.close();

First, I do not create a session manually in principle. To communicate with the DB, I do get an EntityManager :

 EntityManager manager = Persistence .createEntityManagerFactory("COLIBRI") .createEntityManager(); 

And then I use it, like this:

 public Costumer get(long id) { return manager.find(Costumer.class, id); } 

Call manager.close(); Does not help.

Call ((Session)costumerService.manager.getDelegate()).getSessionFactory().close(); also does not help, although it appears in the logs:

 апр 04, 2017 6:27:42 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop INFO: HHH10001008: Cleaning up connection pool [jdbc:hsqldb:file:testdb]