Aaron Andersen created CAY-1725:
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Summary: NullPointerException from call to removeToManyTarget
Key: CAY-1725
URL: https://issues.apache.org/jira/browse/CAY-1725
Project: Cayenne
Issue Type: Bug
Components: Core Library
Affects Versions: 3.0.2, 3.0.1
Reporter: Aaron Andersen
I am using Cayenne version 3.0.1.
In CayenneModeler I have created an "Approver" DbEntity and a "Department"
DbEntity (as well as the corresponding ObjEntity classes). I have also created
an "Authorization" DbEntity to act as a join table for the Approver and
Department tables. Every Approver object has a list of Department objects
associated with it, and vice versa so in CayenneModeler I have added a
"departmentArray" relationship to the Approver object which has "to many, list"
semantics.
When I use the Approver method "void addToDepartmentArray (Department)"
everything works fine, but when I use the Approver method "void
removeFromDepartmentArray (Department)" (which simple calls removeToManyTarget)
a NullPointerException is thrown. A backtrace and quick debug tells me the null
pointer exception originates from:
org.apache.cayenne.access.DataDomainFlattenedBucket.addFlattenedDelete(DataDomainFlattenedBucket.java:82)
The code on lines 81 and 82 of this file are as follows:
[81] List flattenedSnapshots =
flattenedDeleteInfo.buildJoinSnapshotsForDelete(node);
[82] if (!flattenedSnapshots.isEmpty()) {
Inspecting flattenedSnapshots on line 82 shows that flattenedSnapshots is null
hence accessing the isEmpty method is causing the null pointer exception.
I have also tested with Cayenne 3.0.2 and the same error occurs.
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