Hello,
I am using Cayenne version 3.0.1 and having an issue.
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.
A couple of obvious points I can list off are:
- both the approver and the department are not null
- the department does belong to the approvers list of departments
- both objects are in the same context
I'm not sure what I am doing incorrect to cause this null pointer exception
but I would really appreciate any help.
Thank you for your time!
Aaron
