Barcode problem on report 10g r2

Question

Dear all,
I am testing on a solution provided by IDAutomation. I followed the tutorial with the following page: http://www.idautomation.com/oracle/java_barcode.html
However, I am not able to generate the barcode. The Report Builder returned a REP-2103: Column 'CF_1' : PL/SQL formula returned invalid value or no value.
I have the PL/SQL as below:
/*name of temp file*/
ImageFile VarChar2(250);
/*object containing barcode properties*/
BarcodeObject ORA_JAVA.JOBJECT;
/*object that creates jpeg of barcode based on BarcodeObject*/
BarcodeEncoderObject ORA_JAVA.JOBJECT;
begin
/*Get a temporary file name for the jpeg*/
/*On Solaris Unix, use the following code to create the temp file: ImageFile := srw.create_temporary_filename() || '.jpg'; */
imageFile := srw.create_temporary_filename();
/*Create the barcode object*/
BarcodeObject := Barcode.new();
/*Set the symbology*/
Barcode.setSymbologyID(BarcodeObject, Barcode.CODE128);
/*set the data to encode*/
Barcode.setDataToEncode(BarcodeObject, to_char(:ProductID));
/*Create the jpeg*/
BarcodeEncoderObject := BarcodeEncoder.new(BarcodeObject, 'JPEG',ImageFile);
/*If, for some reason, the barcode is not created, return null
otherwise, return the name of the barcode image jpeg that was
created */
if ORA_JAVA.IS_NULL(BarcodeEncoderObject) then
return(NULL);
else
return(ImageFile);
end if;
Is there anything wrong with it?
Thanks

Answer 1

I did another test on the code. I replaced the
imageFile := srw.create_temporary_filename();
with
imageFile := 'c:\temp\a.jpg';
The report runs and generates a barcode. So, does it mean that my report builder is not able to generate a temporary filename?