Andrus Adamchik created CAY-1997:
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Summary: Difference in NULL handling inside the path between
PropertyUtils and DataObject.readNestedProperty
Key: CAY-1997
URL: https://issues.apache.org/jira/browse/CAY-1997
Project: Cayenne
Issue Type: Bug
Affects Versions: 4.0.M2
Reporter: Andrus Adamchik
Assignee: Andrus Adamchik
There is an inconsistency in handling of NULLs during property path resolving
between Cayenne PropertyUtils.getProperty(..) (used for POJOS) and
CayenneDataObject.readNestedProperty(..).
PropertyUtils will throw an exception when encountering NULL value in the
middle of the path. CayenneDataObject simply returns NULL.
I think both strategies have their place (and ideally should be either
configurable or use new Java 8 "Optional" return -
http://www.oracle.com/technetwork/articles/java/java8-optional-2175753.html ).
However as a practical matter if we want Expressions to evaluate seamlessly
between DataObjects and POJOs (something that I am doing all the time), at
least the two evaluators should be consistent.
My vote is to use CayenneDataObject.readNestedProperty strategy (return null),
as this is the older and more common scenario, and everyone is used to it.
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