NullPointerException, because of relationship cycles before deleting objects
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Key: CAY-714
URL: http://issues.apache.org/cayenne/browse/CAY-714
Project: Cayenne
Type: Bug
Components: Cayenne Core Library
Versions: 1.2 [STABLE]
Environment: cayenne-1.2.1, derby
Reporter: Peter Karich
The following code:
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ArrayList temporaryObjects = new ArrayList();
DataContext context = DataContext.createDataContext();
Room r = (Room) context.createAndRegisterNewObject(Room.class);
r.setName("testRoom");
temporaryObjects.add(r);
TimeInterval ti =
(TimeInterval)context.createAndRegisterNewObject(TimeInterval.class);
temporaryObjects.add(ti);
ti.setToOneTarget("room", r, false);
context.deleteObjects(temporaryObjects);
temporaryObjects.clear();
context.commitChanges();
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will throw a NPE at 'context.deleteObjects':
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Exception in thread "main" java.lang.NullPointerException
at
org.objectstyle.cayenne.CayenneDataObject.removeToManyTarget(CayenneDataObject.java:281)
at
org.objectstyle.cayenne.access.DataContextDeleteAction.processDeleteRules(DataContextDeleteAction.java:239)
at
org.objectstyle.cayenne.access.DataContextDeleteAction.deleteNew(DataContextDeleteAction.java:149)
at
org.objectstyle.cayenne.access.DataContextDeleteAction.performDelete(DataContextDeleteAction.java:131)
at
org.objectstyle.cayenne.access.DataContext.deleteObject(DataContext.java:1043)
at
org.objectstyle.cayenne.access.DataContext.deleteObjects(DataContext.java:1027)
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Here the mapping:
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<?xml version="1.0" encoding="utf-8"?>
<data-map project-version="1.1">
<property name="defaultPackage" value="caybug"/>
<db-entity name="ROOM">
<db-attribute name="NAME" type="VARCHAR" length="24"/>
<db-attribute name="R_ID" type="INTEGER" isPrimaryKey="true"
isMandatory="true"/>
</db-entity>
<db-entity name="TIME_INTERVAL">
<db-attribute name="ROOM_FK" type="INTEGER"/>
<db-attribute name="TI_ID" type="INTEGER" isPrimaryKey="true"
isMandatory="true"/>
</db-entity>
<obj-entity name="Room" className="caybug.Room" dbEntityName="ROOM">
<obj-attribute name="name" type="java.lang.String"
db-attribute-path="NAME"/>
</obj-entity>
<obj-entity name="TimeInterval" className="caybug.TimeInterval"
dbEntityName="TIME_INTERVAL">
</obj-entity>
<db-relationship name="TIME_INTERVALS" source="ROOM" target="TIME_INTERVAL"
toMany="true">
<db-attribute-pair source="R_ID" target="ROOM_FK"/>
</db-relationship>
<db-relationship name="ROOM" source="TIME_INTERVAL" target="ROOM"
toMany="false">
<db-attribute-pair source="ROOM_FK" target="R_ID"/>
</db-relationship>
<obj-relationship name="timeIntervals" source="Room" target="TimeInterval"
deleteRule="Nullify" db-relationship-path="TIME_INTERVALS"/>
<obj-relationship name="room" source="TimeInterval" target="Room"
deleteRule="Nullify" db-relationship-path="ROOM"/>
</data-map>
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A temporary fix is to break the cycle before every delete:
ti.setToOneTarget("room", null, false);
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