Class of lazy loaded objects loaded by a discriminator is incorrect
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Key: IBATIS-463
URL: https://issues.apache.org/jira/browse/IBATIS-463
Project: iBatis for Java
Issue Type: Bug
Components: SQL Maps
Affects Versions: 2.3.0
Reporter: Patrick Savage
This is a known issue described in
http://opensource.atlassian.com/confluence/oss/display/IBATIS/Lazy+loading+issues
(issue #1).
The problem is that since the proxy lazy result object extends the parent
result map's class instead of the appropriate discriminator submap's class,
there is no way to get the object as the discriminator submap's class. The
correct subclass cannot be determined until the object is loaded so the proxy
can't extend the subclass. So one way to fix this is to not lazy load the
object which is the solution proposed in the wiki link above. However, that
proposed solution is not ideal because the parent result map's class must be
abstract which is not always the case. An alternative solution is to never lazy
load objects that are loaded with a discriminator, even if lazy loading is
enabled globally.
I've attached a patch to version 2.3.0 that implements this.
I think this issue is fairly major because there does not seem to be any way to
get the subclass unless you use reflection to pull out the lazy loaded
resultObject from the proxy (EnhancedLazyResultLoaderImpl).
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