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Hibernate: read-only on @Column in embedded ID composite key classes mapping exception - bug?

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Hibernate Python MySQL Database
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Here's the DB design (DDL):

Here's the Zip class + composite primary key class:

Hibernate stack trace:

What's this? country_code is mapped as read-only (insertable = false, updatable = false) in the composite primary key class. This works perfectly with EclipseLink! IIRC @Embeddable classes allow @Basic, @Column, @Enumerated, @Temporal, @Lob, and @Embedded on its columns, so this should work. Note the code is JPA 1.0 compatible.

The exception vanishes when putting the insertable = false, updatable = false on the @JoinColumn, but this is not what I want. I prefer my associations to be writable...

Is this a Hibernate bug? I'm using Hibernate 3.6 stable.

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