Lazy initialization on single ended asociation and list/map collection type
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Key: HIB-130
URL: http://jira.andromda.org/browse/HIB-130
Project: Hibernate Cartridge
Type: Bug
Versions: 3.1-RC1
Reporter: Sverker Abrahamsson
Assigned to: Carlos Cuenca
I'm reporting two issues on the same time, sorry for that but they affects the
same lines in the template so it's difficult to separate.
Issue 1: Lazy loading of single-ended asociations does not work since
lazy="true" does not give the expected behaviour. The Hibernate doc is a bit
confusing on that issue but in the upcomming 3.1 release it's clearly explained
that there are three valid values for the lazy attribute: proxy, no-proxy and
false. Proxy means that a lazy-load proxy is used instead of eager loading the
asociation. No-proxy means that instead of using a proxy, the bytecode is
manipulated to accomplish the same functionality. False means that the
asociation is eager loaded.
Ironically lazy="true" means that the asociation is eagerly loaded.
I also noticed that setting fetch="join" overides the lazy setting, causing an
eager load, so instead I let it depend on the lazy tagged value so that if a
asociation is to be lazy, fetch="select" is used. If an asociation is to be
eager loaded it can be controlled by namespace parameter or tagged value if it
is done using join or select.
Issue 2: I noticed that it did not work to set collection type to map because
Map cannot be casted to a Collection. I also saw that it used the depreciated
tag index to specify map key. I've done the following changes:
* If not specificCollectionInterfaces is true then map association will use Map
interface and Collection subclasses (such as Set and List) use Collection
interface. That is since Map cannot be casted to a Collection.
* I believe there is a bug when using namespace parameter
associationEndCollectionIndexType. That is solved now so that it can look up
e.g. datatype::String.
* I've set default collection index type to be datatype::String by setting
default value on the namespace parameter. Keep it if you want but I believe
there should be reasonable defaults which can be modified by settings.
Hibernate defaults to VARCHAR if this attribute is not specified.
* I've also added generation of index column name (for map and list
asociations) which is used unless it is specified by either namespace parameter
or tagged value. It's an optional parameter, Hibernate itself calls it "idx" if
not specified.
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