[jira] [Updated] (CAY-1725) NullPointerException from call to removeToManyTarget

["Aaron Andersen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAY-1725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aaron Andersen updated CAY-1725:
--------------------------------

    Attachment: cayenne.xml
                KeysMap.map.xml
                KeysDomainNode.driver.xml

The Cayenne configuration files used to create the database and java classes.
                
> 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: 3.0.1, 3.0.2
>            Reporter: Aaron Andersen
>         Attachments: KeysDomainNode.driver.xml, KeysMap.map.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(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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