Hi Rick!
I’m trying to finally solve the long outstanding issue that our @Strategy and
FieldStrategies configuration is pretty much broken. See
https://issues.apache.org/jira/browse/OPENJPA-2341
It is broken if the type you like to store is not Serializable. E.g. (taken
from my current unit test):
@Strategy("org.apache.openjpa.persistence.strategy.value.PrincipalValueStrategyHandler")
private Principal user;
This blows up because OpenJPA totally ignores this field (as it is not any of
the spec defined types and the Strategy gets ignored). I was not able to get it
working by adding @Basic (blows up complaining that the field is not
Serializable), @Column (just ignored), @Persistent (complains about tons of
other stuff).
It ‚accidentially‘ works with Serializable classes because those get picked up
as BASIC. Like joda and java8 LocalDate for example.
But they are not really @Basic!
If you take the sample above, then the representation of the instance in the
entity has _nothing_ to do with the final representation in the database. That
could e.g. simply store that info in a VARCHAR(20)
I gonna attach my current wip to the JIRA.
Not sure whether we should ty to cleanly sovle this or back up and just commit
what I have now which at least works for Serializable fields.
LieGrue,
strub
> Am 30.06.2015 um 21:22 schrieb Rick Curtis <curti...@gmail.com>:
>
> Any more context as to the problem you're running into/trying to solve?
>
> On Tue, Jun 30, 2015 at 11:31 AM, Mark Struberg <strub...@yahoo.de> wrote:
>
>> Hi folks!
>>
>> I sense some chicken-egg proglem with FieldMapping and what field becomes
>> a persistent column.
>>
>> The point is that only fields which have a valid FieldMapping will become
>> a persistent column.
>>
>> Currently the main check - as far as I do understand so far - is in
>> PersistenceMetaDataDefaults#getPersistenceStrategy.
>> Only fields which have some specific mapping annotations
>> (PersistenceMetaDataDefaults#_strats) or implement Serializable get
>> automatically picked up. Other classes get totally ignored. Even if I
>> explicitly have a @Strategy annotation on them or if I register global
>> FieldStrategies.
>>
>> I cannot extend the _strats to @Strategy.class as
>> PersistenceMetaDataDefaults is defined in openjpa-persistence but Strategy
>> is only defined later in openjpa-persistence-jdbc.
>>
>> What we could possibly do is to extend _attrs with the @Column annotation
>> class?
>>
>> Any other ideas?
>>
>> LieGrue,
>> strub
>
>
>
>
> --
> *Rick Curtis*
