This is actually a Hibernate bug, not a JPA bug. I'm not exactly sure about how the projects are laid out in this Jira, but I think you have filed this bug against the Java Persistence API and not against the Hibernate implementation.
See HHH-8111. AttributeConverters are broken in Hibernate 4.3.0.Beta2,Beta3 for any types that Hibernate already supports natively (such as Boolean), including anything marked Serializable (so, pretty much AttributeConverters are completely broken).
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This is actually a Hibernate bug, not a JPA bug. I'm not exactly sure about how the projects are laid out in this Jira, but I think you have filed this bug against the Java Persistence API and not against the Hibernate implementation.
See HHH-8111. AttributeConverters are broken in Hibernate 4.3.0.Beta2,Beta3 for any types that Hibernate already supports natively (such as Boolean), including anything marked Serializable (so, pretty much AttributeConverters are completely broken).