Georgi created OLINGO-44:
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Summary: $expand doesn't work for several projections of a child
navigation property
Key: OLINGO-44
URL: https://issues.apache.org/jira/browse/OLINGO-44
Project: Olingo
Issue Type: Bug
Components: odata2-jpa
Affects Versions: 1.0.0, 1.1.0
Reporter: Georgi
Consider the following JPA model with one-to-many CMRs:
X(1) -> (N) A (1) -> (N) B (1) -> (N) C
X(1) -> (N) A (1) -> (N) D (1) -> (N) E
To get the complete model for X inline, I use $expand:
/X(1)/$expand=A/B/C,A/D/E
However, this yields a NullPointerException in JpaExpandCallback:108
Debugging the code shows that the reason is that the data constructed for
response is missing anything but one of the paths provided in the $expand list.
I think that the reason is the algorithm of parse2EdmNavigationValueMap, which
takes as input a valid navigationPropertyList, but fails to produce and
adequate navigation properties map for this case. That is probably due to the
matching navigation property names (ADetails), which effectively overwrites
previous entries. That leaves the system in an inconsistent state and we end up
with the NPE in JpaExpandCallback.
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