Generated id fix (#3180)

* Add project for hibernate immutable article
Add Event entity
Add hibernate configuration file
Add hibernateutil for configuration
Add test to match snippets from article

* Update master

* Update hibernate tests
Change sesssion handling
Modify event creation

* Remove setId method on generated id

persistence-modules/spring-hibernate-5/src/test/java/com/baeldung/hibernate/immutable/HibernateImmutableIntegrationTest.java

@@ -115,7 +115,6 @@ public class HibernateImmutableIntegrationTest {
 
     private static void createEventGenerated() {
         EventGeneratedId eventGeneratedId = new EventGeneratedId("John", "Doe");
-        eventGeneratedId.setId(4L);
         session.save(eventGeneratedId);
     }