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From "Andrus Adamchik (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (CAY-1725) NullPointerException from call to removeToManyTarget
Date Fri, 13 Jul 2012 20:13:34 GMT

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

Andrus Adamchik closed CAY-1725.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 3.2M1
                   3.1B2
                   3.0.3

Fixed on all supported branches
                
> 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
>             Fix For: 3.0.3, 3.1B2, 3.2M1
>
>         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.
> Here is a simple code snippet to reproduce this error:
> // make sure our context is clear of any changes
> context.rollbackChanges ();
> // set up a new approver and department
> Approver approver = context.newObject (Approver.class);
> Department dept = context.newObject (Department.class);
> approver.setLogin ("approver");
> dept.setName ("departmentA");
> // add the department to the approver
> approver.addToDepartmentArray (dept);
> // commit these to the database, so far everything should be running fine
> context.commitChanges ();
> // remove the department from the approver... 
> // this should work fine because we haven't committed yet
> approver.removeFromDepartmentArray (dept);
> try {
>     // this is where things go bad
>     context.commitChanges ();
> } catch (Exception e) {
>     // error has occurred
>     // at this point the record in the Authorization table still exists
> }

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