I am using the Data Loader (v 16.0) to run a batch process.  I am able to run an update from the command line without any difficulty.

Here is my bean:

    <bean id="LocationUpdate"

          class="com.salesforce.lexiloader.process.ProcessRunner"

          singleton="false">

        <description>Accountupdate job takes a csv file of the locations and uploads the latest information from Lichen.</description>

        <property name="name" value="LocationUpdate"/>

        <property name="configOverrideMap">

            <map>

                <entry key="sfdc.debugMessages" value="false"/>

                <entry key="sfdc.debugMessagesFile" value="c:\dataloader\samples\status\accountMasterSoapTrace.log"/>

                <entry key="sfdc.endpoint" value="https://www.salesforce.com"/>

                <entry key="sfdc.username" value="xxxxxxxxx"/>

                <entry key="sfdc.password" value="xxxxxxxxx"/>

                <entry key="process.encryptionKeyFile" value="C:\Program Files\salesforce.com\Apex Data Loader 16.0\bin\encryption.key"/>

                <entry key="sfdc.timeoutSecs" value="600"/>

                <entry key="sfdc.loadBatchSize" value="200"/>

                <entry key="sfdc.entity" value="Location__c"/>

                <entry key="process.operation" value="upsert"/>

<entry key="sfdc.externalIdField" value="XKEY_LOCATIONID__C"/>

                <entry key="process.mappingFile" value="C:\Program Files\salesforce.com\Apex Data Loader 16.0\conf\account_mapping.sdl"/>

                <entry key="dataAccess.name" value="C:\SFDC-Lichen-Update\data\location_update.csv"/>

                <entry key="dataAccess.type" value="csvRead"/>

                <entry key="process.initialLastRunDate" value="2005-12-01T00:00:00.000-0800"/>

            </map>

        </property>

    </bean>

My XKey_LocationID__c is in the CSV and is properly labeled in the file.  I can do the same operation successfully through the UI.

Every record gets the follow error through the batch job - XKey_LocationID__c not specified

"[external ID name] not specified" error when attempting to call upsert()

Any help would be appreciated !!!