On Mon, Jun 29, 2009 at 2:03 PM, Laird Nelson
<ljnelson@xxxxxxxxx> wrote:
On Mon, Jun 29, 2009 at 12:44 PM, Laird Nelson
<ljnelson@xxxxxxxxx> wrote:
I've gotten this error while marking up some Entities and running them through unit tests. Both Hibernate and OpenJPA deal with my setup just fine, but it looks like at EntityManagerFactory creation time, EclipseLink barfs with this error. I've reproduced the stack below.
Through some blind trial and error, I found where this bug is.
I have one entity, call it B, that has an @EmbeddedId field that consists of four columns.
I have another entity, call it A, that has a @ManyToOne relationship with B. The field in question is annotated like this:
@ManyToOne
private B b;
And that is the problem. I have not specified the full regiment of @JoinColumns.
So, to recap: "Java type [null] is not a valid database type" actually means "You forgot to specify @JoinColumns on your @ManyToOne relationship."
Interestingly, neither Hibernate nor OpenJPA seem to mind--who's correct here?
Best,
Laird
