Error at saving entity via Hibernate session

Description

At saving entity I got following error:

19:26:28.595 [JavaFX Application Thread] ERROR com.xxx.DatabaseConnectionsController - cannot save DB connection: class org.hibernate.id.IdentifierGeneratorHelper$2 cannot be cast to class java.lang.Long (org.hibernate.id.IdentifierGeneratorHelper$2 is in module org.hibernate.orm.core@6.0.0.Alpha2 of loader 'app'; java.lang.Long is in module java.base of loader 'bootstrap')
19:26:28.599 [JavaFX Application Thread] ERROR com.xxx.DatabaseConnectionsController - org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl@67ea3277 is closed

Entity:

As you can see, I use GenerationType.IDENTITY as strategy for 'id' field. I try to use other strategies (AUTO), but without results.

I tried to create table via SQL-script, but it didn't help:

Content of hibernate.cfg.xml:

Source code:


MWE:

Environment

OS: macOS 10.13, 10.14
DB: H2 1.4.199
JVM: 12

Assignee

Unassigned

Reporter

Oleg Vorobiov

Fix versions

None

Labels

backPortable

None

Suitable for new contributors

None

Requires Release Note

None

Pull Request

None

backportDecision

None

Affects versions

Priority

Major
Configure