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Re: [eclipselink-users] Virtual Metlhods | questions
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Guy,
When is do oneToOneMapping.useBasicIndirection(). then the eclipselink
deployment fails complaining about the value holder. The below is the
exception trace
Exception [EclipseLink-60] (Eclipse Persistence Services -
2.3.2.v20111125-r10461):
org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The method [_persistence_set_phoneNumbers_vh] or
[_persistence_get_phoneNumbers_vh] is not defined in the object
[gridcache.model.Employee].
Internal Exception: java.lang.NoSuchMethodException:
gridcache.model.Employee._persistence_get_phoneNumbers_vh(java.lang.String)
Mapping: org.eclipse.persistence.mappings.OneToManyMapping[phoneNumbers]
Descriptor: RelationalDescriptor(gridcache.model.Employee -->
[DatabaseTable(TLG_GC_EMPLOYEE)])
Exception [EclipseLink-127] (Eclipse Persistence Services -
2.3.2.v20111125-r10461):
org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The get method for the attribute [phoneNumbers] does
not return a ValueHolderInterface, but the mapping uses indirection.
Mapping: org.eclipse.persistence.mappings.OneToManyMapping[phoneNumbers]
Descriptor: RelationalDescriptor(gridcache.model.Employee -->
[DatabaseTable(TLG_GC_EMPLOYEE)])
Exception [EclipseLink-129] (Eclipse Persistence Services -
2.3.2.v20111125-r10461):
org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The set method for the attribute [phoneNumbers] does
not take a ValueHolderInterface as its parameter, but the mapping uses
indirection.
Mapping: org.eclipse.persistence.mappings.OneToManyMapping[phoneNumbers]
Descriptor: RelationalDescriptor(gridcache.model.Employee -->
[DatabaseTable(TLG_GC_EMPLOYEE)])
Regarding Read/WriteTransformer >>>> Yes, in the virtual methods we get Map
of attributes. My use case is to give the customer "Value Object". So I was
hopping, I could perform that transformation using eclipselink way.
Guy Pelletier wrote:
>
> Gaurav,
>
> To use indirection set:
>
> oneToOneMapping.useBasicIndirection()
>
> Also, read and write transformers are used and specified on a
> TransformationMapping. Not sure I completely understand your question
> and their usage with the attribute accessor. The accessor is used to
> retrieve the value from the object into the mapping. The mapping can
> then apply any transformations or conversions. When using a
> DirectToFieldMapping you could use a converter on the mapping.
>
> Cheers,
> Guy
>
> On 17/07/2012 3:39 AM, Gaurav Malhotra wrote:
>> Hi All, I am trying to specify DirectToFieldMapping, OneToMapping and
>> OneToManyMapping in the session customizer. Let's take a example of
>> OneToOneManyMapping . I am setting up the OneToOneMapping as follows.
>> Currently I am specifying "do not use indirection". Is it possible to
>> specify - IndirectionPolicy and make sure the relationship uses
>> ValueHolder (lazy initialization). I will be great if somebody can
>> point me to sample code to achieve this.I want to programatically
>> weave in the lazy loading value holder code. private void
>> oneToOneMapping(ClassDescriptor classDescriptor) { OneToOneMapping
>> oneToOneMapping = new OneToOneMapping();
>> oneToOneMapping.setDescriptor(classDescriptor);
>> oneToOneMapping.setCascadeAll(true);
>> *oneToOneMapping.dontUseIndirection();* VirtualAttributeAccessor
>> virtualAttributeAccessor2 = new VirtualAttributeAccessor();
>> virtualAttributeAccessor2.setAttributeName("phoneNumber");
>> virtualAttributeAccessor2.setGetMethodName("get");
>> virtualAttributeAccessor2.setSetMethodName("set");
>> virtualAttributeAccessor2.initializeAttributes(classDescriptor.getJavaClass());
>> oneToOneMapping.setAttributeAccessor(virtualAttributeAccessor2);
>> oneToOneMapping.setAttributeName("phoneNumber");
>> oneToOneMapping.setReferenceClass(PhoneNumber.class);
>> oneToOneMapping.setForeignKeyFieldName("PHONE_NUMBER_ID");
>> VectordatabaseFields = new Vector();
>> databaseFields.add("PHONE_NUMBER_ID");
>> oneToOneMapping.setForeignKeyFieldNames(databaseFields);
>> classDescriptor.getMappings().add(oneToOneMapping); } Another question
>> ============= Is it possible to specify Reader/WriterTrasnformer with
>> VirtualMethods. That is, to apply Reade/WriteTransformer to the
>> attributes in the extension Map. NOTE > In my use case, extension
>> attributes can be DirectToFieldMapping/OneToOne/OneToMany attributes
>> which I am making it programatically in the session customization
>> phase. ~GM
>> ------------------------------------------------------------------------
>> View this message in context: Virtual Metlhods | questions
>> <http://old.nabble.com/Virtual-Metlhods-%7C-questions-tp34172077p34172077.html>
>> Sent from the EclipseLink - Users mailing list archive
>> <http://old.nabble.com/EclipseLink---Users-f26658.html> at Nabble.com.
>>
>>
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>> eclipselink-users@xxxxxxxxxxx
>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
> --
>
> Oracle <http://www.oracle.com>
> Guy Pelletier
>
> ORACLE Canada, 45 O'Connor Street Suite 400 Ottawa, Ontario Canada K1P 1A4
> Green Oracle <http://www.oracle.com/commitment> Oracle is committed to
> developing practices and products that help protect the environment
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