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    "Failed to retrieve preview records" in client preview and "Duplicate declaration for variable" in jobd.log

    • Product: Voyager
    • Product Version: 8.0.0 and higher
    • Relevant for Installation Type: Dedicated-Direct, Direct, Local, Total Care

     

    Problem symptoms

    Attempt to preview data change results in "Failed to retrieve preview records"

    Data Change job with same parameters fails and logs error to jobd.log:

    2016-06-28 11:31:31,282 41133825 [main] INFO com.exlibris.voyager.jobd.DataChangeJob - Error building knowledge base 
    com.exlibris.core.infra.common.exceptions.ParseDslException: Error 30208 
    java.lang.Throwable: Duplicate declaration for variable 'df{field}' in the rule '{rule name}' : [Rule name='{rule name}'] 
    Duplicate declaration for variable 'sf{field and subfield}' in the rule '{rule name}' : [Rule name='{rule name}'] 

    Cause

    Data Change Rule Set has defined multiple conditions for same field/subfield to be applied simultaneously.

    Resolution

    Divide conditions for same field/subfield into separate rules, or select one condition to use in the rule.

    Additional Information

    Example: Data Change Rule Set contains multiple conditions on 245 subfield a with logic like

     

    when 
    MARC with subfield "245"."a" contains "cat" 
    MARC with subfield "245"."a" contains "cats" 

     

    then
    replace string "cat" with string "dog"

    replace string "cats" with string "dogs"

     

    In this scenario, there are two definitions for the 245a variable, and Voyager cannot apply both simultaneously. To resolve this, create two separate rules (can still be within same Data Change Rule Set) with logic like

     

    when 
    MARC with subfield "245"."a" contains "cat" 

    then

    replace string "cat" with string "dog"

     

    when

    MARC with subfield "245"."a" contains "cats" 

    then

    replace string "cats" with string "dogs"


    • Article last edited: 28-Jun-2016