I’ve stumbled upon this issue when I tried to convert the Spring PetClinic to a Quarkus application. I’ve reported it there as https://github.com/quarkusio/quarkus/issues/3643 .

I’ve been able to work around the issue by changing Vet like so:

    @ManyToOne
    @JoinColumn(name = "pet_id")
    public Pet pet;

And changing Pet like so:

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "pet", fetch = FetchType.EAGER)
    public Set<Visit> visits = new LinkedHashSet<>();

Maybe this helps anyone who accidentally hits the same bug.