Hibernate sqlite SQLITE_BUSY

I am trying to use hibernate with sqlite in multi-threaded application and getting SQLITE_BUSY error:

[SQLITE_BUSY]  The database file is locked (database is locked)

Simplified code which reproduces error in 1 thread:

Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(new Object());
session.flush();

Session session2 = sessionFactory.openSession();
session2.beginTransaction();
session2.save(new Object());
session2.getTransaction().commit(); 

As widely suggested i set pool_size to 1, but it didn't help

<property name="connection.pool_size">1</property>
<property name="hibernate.connection.pool_size">1</property>

packages that i use:

sqlite-jdbc: 3.8.7
hibernate: 4.3.8