I'm not sure if HibernateEntityValueEncoder called
PersistentClass.getIdentifierProperty() before (in 5.0.x) when my code
worked...
getIdentifierProperty() returns an instance of hibernate.mapping.Property
which may be a Composite ID (which seems to be the official name for
multi-column ids). In other words this method should return the id-property
of my class even though this 'property' isn't defined by a single field in
my case.
So I think it should return a property, although a multi-valued one.
All this indeed strongly suggests that it is a hibernate issue..
I will investigate further.
Thanks.
Ulrich Stärk wrote:
>
> This /seems/ to be a Hibernate issue.
> PersistentClass.getIdentifierProperty() is apparently
> returning null.
>
> On second thought this seems just natural since there is no property
> representing your Id.
>
> Uli
>
> On 19.08.2009 12:39 schrieb Britske:
>> I'm in the process of updating from 5.0.17 to 5.1.0.5 and breaking my
>> head on
>> this one:
>>
>> Getting a NullPointerException in HibernateEntityValueEncoder when trying
>> to
>> loop a hibernate Entity where the entity has a multi-column id.
>>
>> I actually have this with every entity with a multi-column id so please
>> consider the below as an example of the generalized case. See relevant
>> snippets as well as trace below.
>>
>> After some investigation it SEEMS that:
>>
>> - looping of entities (for which HibernateEntityValueEncoder is called)
>> WORKS for entities with standard IDs
>> - looping FAILS for entities with an @IdClass specified (i.e:
>> multi-column
>> id)\
>> - querying of all entities works (so it isn't a hibernate issue as far
>> as I
>> can tell)
>>
>> I double checked this by transforming the mapped class to contain a
>> single
>> id instead of the multi-column id
>> (I simply concatenated the columns that made up the id in sql and updated
>> this value to a new column. Afterwards I assigned this new column to be
>> the
>> id of the table, and updated the hibernate entity accordingly. )
>>
>> Afterwards the code just works.
>>
>> Is there a reason why multi-column entities don't seem to be working in
>> my
>> case? All dependencies are correct as far as I can tell. Anyone
>> experienced
>> this?
>>
>>
>> relevant code:
>>
>> .tml
>> ------------------------
>> <t:loop source="CityTemperaturesOrEmptyIfNonFound" value="CurCityTemp">
>> <!--
>> LINE GIVING ERROR -->
>> ${CurCityTemp.temp}
>> </t:loop>
>>
>> Please note that simply calling CityTemperaturesOrEmptyIfNonFound from a
>> different method just works and returned results. It's just that the
>> looping-code raises the error because the entity can't be encoded.
>> (stacktrace at the end)
>>
>>
>> relevant part of old entity class: (FAILS)
>> -------------------------------------------
>> @Entity
>> @Table(name = "citytemperatures")
>> @IdClass(CityTemperatureId.class) //CityTemperatureId is default id class
>> combining two columns
>> public class CityTemperatureBak
>> {
>> @Id
>> private String cityid;
>>
>> @Id
>> private String dateid;
>> }
>>
>> relevant part of new entity class (WORKS)
>> -------------------------------------------
>> @Entity
>> @Table(name = "citytemperatures")
>> public class CityTemperature
>> {
>> @Id
>> private String id;
>>
>> private String cityid;
>> private String dateid;
>> }
>>
>> relevant part of stacktrace:
>> ------------------------------------
>> Caused by: java.lang.NullPointerException
>> at
>> org.apache.tapestry5.internal.hibernate.HibernateEntityValueEncoder.<init>(HibernateEntityValueEncoder.java:54)
>> at
>> org.apache.tapestry5.hibernate.HibernateModule$1.create(HibernateModule.java:100)
>> at
>> org.apache.tapestry5.internal.services.ValueEncoderSourceImpl.getValueEncoder(ValueEncoderSourceImpl.java:49)
>> at
>> $ValueEncoderSource_1233238c1f1.getValueEncoder($ValueEncoderSource_1233238c1f1.java)
>> at
>> org.apache.tapestry5.internal.services.ComponentDefaultProviderImpl.defaultValueEncoder(ComponentDefaultProviderImpl.java:116)
>> at
>> $ComponentDefaultProvider_1233238c0cd.defaultValueEncoder($ComponentDefaultProvider_1233238c0cd.java)
>> at
>> org.apache.tapestry5.corelib.components.Loop.defaultEncoder(Loop.java:304)
>> at
>> org.apache.tapestry5.corelib.components.Loop.containingPageDidLoad(Loop.java)
>> at
>> org.apache.tapestry5.internal.structure.ComponentPageElementImpl$4.run(ComponentPageElementImpl.java:98)
>> at
>> org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:933)
>> ... 61 more
>>
>>
>> Thanks
>> Geert-Jan
>
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