Descriptor exception for "missing mapping for field"

Question

I am using TopLink 9.0.3, oracle database 9, JVM 1.4.
I got one DescirptorException that states that the descriptor misses mapping for one database field.
However I have such field mapped through workbench.
The is the exception.
-----------------exception-----------------------
LOCAL EXCEPTION STACK:
EXCEPTION [TOPLINK-45] (TopLink - 9.0.3 (Build 423)): oracle.toplink.exceptions.DescriptorException
EXCEPTION DESCRIPTION: Missing mapping for field [DatabaseField(DEVICEDB.DEVICEID)].
DESCRIPTOR: Descriptor(ContactDB --> [DatabaseTable(DEVICEDB)])
at oracle.toplink.exceptions.DescriptorException.missingMappingForField(Unknown Source)
at oracle.toplink.internal.descriptors.ObjectBuilder.extractValueFromObjectForField(Unknown Source)
at oracle.toplink.internal.descriptors.ObjectBuilder.extractValueFromObjectForField(Unknown Source)
at oracle.toplink.mappings.OneToManyMapping.extractForeignKeyFromReferenceObject(Unknown Source)
at oracle.toplink.mappings.OneToManyMapping.executeBatchQuery(Unknown Source)
at oracle.toplink.mappings.OneToManyMapping.extractResultFromBatchQuery(Unknown Source)
at oracle.toplink.internal.indirection.NoIndirectionPolicy.valueFromBatchQuery(Unknown Source)
at oracle.toplink.mappings.ForeignReferenceMapping.batchedValueFromRow(Unknown Source)
at oracle.toplink.mappings.ForeignReferenceMapping.valueFromRow(Unknown Source)
at oracle.toplink.mappings.DatabaseMapping.readFromRowIntoObject(Unknown Source)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(Unknown Source)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildObject(Unknown Source)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildObjectsInto(Unknown Source)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.buildObjectsFromRows(Unknown Source)
at oracle.toplink.queryframework.ReadAllQuery.execute(Unknown Source)
at oracle.toplink.queryframework.DatabaseQuery.execute(Unknown Source)
at oracle.toplink.queryframework.ReadQuery.execute(Unknown Source)
at oracle.toplink.publicinterface.Session.internalExecuteQuery(Unknown Source)
at oracle.toplink.threetier.ServerSession.internalExecuteQuery(Unknown Source)
at oracle.toplink.publicinterface.Session.executeQuery(Unknown Source)
at oracle.toplink.internal.indirection.QueryBasedValueHolder.instantiate(Unknown Source)
at oracle.toplink.internal.indirection.DatabaseValueHolder.getValue(Unknown Source)
at oracle.toplink.indirection.IndirectList.buildDelegate(Unknown Source)
at oracle.toplink.indirection.IndirectList.getDelegate(Unknown Source)
at oracle.toplink.indirection.IndirectList.isEmpty(Unknown Source)
The is my mapping file for DeviceDB and ContactDB. The ContactDB is a subclass of the DeviceDB.
Clearly from the mapping below, the DeviceDB has a mapping for the database filed DeviceID.
The ContactDB is a subclass of DeviceDB. Therefore the ContactDB also should have a mapping for
database field deviceID
----------------------- partial mapping file for DeviceDB----------
public Descriptor buildDeviceDBDescriptor() {
     Descriptor descriptor = new Descriptor();
     descriptor.setJavaClass(DeviceDB.class);
     descriptor.addTableName("DEVICEDB");
     descriptor.addPrimaryKeyFieldName("DEVICEDB.DBID");
     // Inheritance properties.
     descriptor.getInheritancePolicy().setClassIndicatorFieldName("DEVICEDB.CLASS");
     descriptor.getInheritancePolicy().addClassIndicator(ContactDB.class, "c");
     descriptor.getInheritancePolicy().addClassIndicator(ContentDB.class, "f");
     OneToOneMapping deviceMapping = new OneToOneMapping();
     deviceMapping.setAttributeName("device");
     deviceMapping.setReferenceClass(Device.class);
     deviceMapping.setRelationshipPartnerAttributeName("databases");
     deviceMapping.dontUseIndirection();
     deviceMapping.readOnly();
     deviceMapping.addForeignKeyFieldName("DEVICEDB.DEVICEID", "DEVICE.DEVICEID");
     descriptor.addMapping(deviceMapping);
     return descriptor;
---------------------------partial mapping for ContactDB --------------
public Descriptor buildContactDBDescriptor() {
     Descriptor descriptor = new Descriptor();
     descriptor.setJavaClass(com.access.sync.business.contact.ContactDB.class);
     descriptor.addTableName("DEVICEDB");
     // Inheritance properties.
     descriptor.getInheritancePolicy().setParentClass(com.access.sync.framework.systemObj.DeviceDB.class);
Any help is really appreciated.
jason

Answer 1

Your 1-1 mapping must not be read-only.
deviceMapping.readOnly();Read-only means the mapping will not write the field, and should only be used when another mapping does write the field.