Is it possible to define a UserType for the key in a Map?

Something like this?

@CollectionOfElements
@Type(type = "com.example.CustomDateType)
@MapKey(columns = { @Column(name = "key_value", nullable = false) })
public Map<CustomDate, Double> getDateThresholds()
{
return dateThresholds;
}


This syntax causes the CustomDate to be serialised into the key_value column rather than being converted using the UserType.

Any help would be greatly appreciated.

Thanks.
Ashley

there is an open JIRA issue If I recall

Thanks for the info.

We've managed to work around it by creating a new holder class called DateThreshold and using the javax.persistence.MapKey annotation to create a map of DateThreshold.customDate and DateThreshold.

Do you know, by any chance, what is its JIRA id ?

nope