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https://issues.apache.org/jira/browse/JCR-1145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Felix Meschberger reassigned JCR-1145:
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Assignee: Felix Meschberger
> ObjectConverterImpl.getObject(Session, Class, String) may not resolve mapping
> correctly for incompletely described mappings
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: JCR-1145
> URL: https://issues.apache.org/jira/browse/JCR-1145
> Project: Jackrabbit
> Issue Type: Improvement
> Affects Versions: 1.4
> Reporter: Felix Meschberger
> Assignee: Felix Meschberger
> Fix For: 1.4
>
>
> When a node is mapped by calling the ObjectConverter.getObject(Session,
> Class, String) method and no discriminator property is configured the
> ObjectConverterImpl class tries to find a "best" mapping for the effective
> node. This is done by walking the class descriptor hierarchy starting at the
> descriptor for the selected class until a mapping for the node type is found.
> In case the class descriptor hierarchy is incomplete because an improperly
> defined class descriptor would actually perfectly map the node but is not
> declared to extend (or implement) its parent classes/interfaces, the
> hierarchy walk down will not find the mapping and thus in the end, the
> originally requested class will be instantiated. If the class is abstract or
> an interface this of course fails.
> If an exact class descriptor for the node type would be looked up directly,
> the mapping might be found immediately and the class of the descriptor can be
> verified it actually is assignement compatible with the requested class. If
> this would fail, we could still walk the hierarchy to see, whether we find
> another classdescriptor.
> To clarify the issue consider the following example of an abstract base class
> and a concrete extension class with their node types
> AbstractBaseClass maps abstractly to AbstractBaseType
> BaseClass (extends AbstractBaseClass) maps to BaseType ( with supertype
> AbstractBaseType )
> Note, that the BaseClass mapping does not declare to extend the
> AbstractBaseClass.
> When calling ObjectConverterImpl.getObject(session, AbstractBaseClass.class,
> aBaseTypeNode), the descriptor fore the AbstractBaseClass is inspected agains
> the node and then it is decided to check the class descriptor hierarchy. Node
> mapping can be found by walking the hierarchy and hence the AbstractBaseClass
> is instantiated, which of course fails.
> If the BaseClass mapping would be declared as extending the AbstractBaseClass
> mapping, everything would be fine.
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