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From "Aaron Andersen (JIRA)" <>
Subject [jira] [Updated] (CAY-1725) NullPointerException from call to removeToManyTarget
Date Thu, 12 Jul 2012 13:58:34 GMT


Aaron Andersen updated CAY-1725:

    Attachment: cayenne.xml

The Cayenne configuration files used to create the database and java classes.
> NullPointerException from call to removeToManyTarget
> ----------------------------------------------------
>                 Key: CAY-1725
>                 URL:
>             Project: Cayenne
>          Issue Type: Bug
>          Components: Core Library
>    Affects Versions: 3.0.1, 3.0.2
>            Reporter: Aaron Andersen
>         Attachments: KeysDomainNode.driver.xml,, cayenne.xml
> 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(
> 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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