Hibernate RX insert and flush and refresh return Exception when strategy is IDENTITY

Question

When I try hibernate rx library and running the examples

        // obtain a reactive session
        factory.withTransaction(
                // persist the Authors with their Books in a transaction
                (session, tx) -> session.persist(author1, author2)
                        .flatMap(Mutiny.Session::flush)
                        .flatMap(s -> s.refresh())
        )

and

class Author {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    Integer id;

it will throw CompletionException

Exception in thread "main" java.util.concurrent.CompletionException: org.hibernate.PropertyAccessException: Could not set field value [1] value by reflection : [class org.hibernate.example.reactive.Author.id] setter of org.hibernate.example.reactive.Author.id

I push test code in https://github.com/semistone/hibernate-reactive/commit/398b1570666ed81a7d257020166f2ae59f1c5eb8

could someone help to check it.

Thanks

Answer 1

UPDATE: This is a bug and it will be fixed in Hibernate Reactive 1.0 CR1

The answer is in the comment but I will repeat it here.

You need to add a setter and change the id type to Long to make this work. The Author class becomes:

@Entity
@Table(name="authors")
class Author {
    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotNull @Size(max=100)
    private String name;

    @OneToMany(mappedBy = "author", cascade = PERSIST)
    private List<Book> books = new ArrayList<>();

    Author(String name) {
        this.name = name;
    }

    Author() {}

    void setId(Long id) {
        this.id = id;
    }

    Long getId() {
        return id;
    }

    String getName() {
        return name;
    }

    List<Book> getBooks() {
        return books;
    }
}

Also, you don't need to add the flush operation (.flatMap(Mutiny.Session::flush)) because withTransaction already does that for you.

And you also don't need the s.refresh. Not sure why you would need it there.