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Re: [eclipselink-users] Virtual Metlhods | questions 
Hi Gaurav,
What is your goal with the programatic mapping creation. The reason I ask is that Session Customization happens too late for weaving to make use of the settings you make in the SessionCustomizer - that's the reason for the exception.
Depending on what you are trying to do, you make be able to take advantage a feature that allows you to specify either a file or a class the provides metadata dynamically at startup time. There is some info here: 

http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Extensible_Entities

Look at the sections about Metadata Repository.

-Tom

On 17/07/2012 9:11 AM, Gaurav Malhotra wrote:


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
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