Message Title

Issue Type:	Bug
Assignee:	Unassigned
Created:	14/Mar/2023 03:01 AM
Priority:	Major
Reporter:	Davide D'Alto

Given the following association:

                              class Foo {
		@ManyToOne(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
		@Fetch(FetchMode.JOIN)
		@JoinColumn(name = "bar_key", referencedColumnName = "nat_key")
		Bar bar;
}

class Bar {
		@Id
		@GeneratedValue
		long id;
		
		@Column(name = "nat_key", unique = true)
		String key;
}
                              

Trying to merge a reference association is not going to work (throws an error about id not found).

Example:

                              	@Test
	public void testMergeReference(SessionFactoryScope scope) {
		Bar bar = new Bar( "unique3" );
		scope.inTransaction( session -> {
			session.persist( bar );
		} );
		scope.inTransaction( session -> {
			Foo merged = session.merge( new Foo( session.getReference( Bar.class, bar.getId() ) ) );
			Assertions.assertThat( merged.getBar().getKey() ).isEqualTo( bar.getKey() );
		} );
	}
                              

See test case: https://github.com/hibernate/hibernate-orm/pull/6239/files

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