Consider a persistence application with the following orm.xml:
What will be the effect of the above orm.xml?
A.
The access type for only those entities that have not explicitly specified @Access will be defaulted to field.
B.
The access type for all entities in the persistence unit will be changed to FIELD.
C.
The access type for allentities specified in this orm.xmlwill be changed to FIELD.
D.
The access type for only those entities defined in thisorm-xml for which access is not specified will be defaulted to FIELD.
I think it’s A.
According to JPA 2.0 spec:
12.1:
The absence or present of the xml-mapping-metadata-complete subelement contained in the persistence-unit-defaults subelement of the entity-mappings element controls whether the XML object/relational mapping descriptor is used to selectively override annotation values or whether it serves as a complete alternative to Java language metadata annotations.
[…]
If xml-mapping-metadata-complete is specified and XML elements are omitted, the default values apply. These default values are the same as the corresponding defaults when annotations are used, except in the cases specified in Section 12.2 below.
12.2.1.4 access
The access subelement applies to all managed classes in the persistence unit. The access subelement is overridden by the use of any annotations…
I think D is the answer
answer A :
The access type of only those entities in this persistence unit that do not specify access type through annotation or in a mapping file will be set to FIELD.
The value specified in this element is used only when an entity does not specify the access type. It can do so either by annotation or in the mapping file
Why do you think that A is the right answer, when in the Pro JPA 2 (Mastering the Java Persistence API) book you can find a following explanation:
The access element that is defined in the persistence-unit-defaults section is used to set the access type for all the managed classes in the persistence unit that have XML entries but are not annotated. Its value can be either “FIELD” or “PROPERTY,” indicating how the provider should access the persistent state.
So according to that explanation D should be a right answer. Can someone confirm that?
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