From what I see in the code snippet, I find that you are accessing a form parameter from request, but you are not making sure that it exists i.e it ia non-null value. Make sure that it is not returning a null value by including this statement "if (barCodeValue!=null)" as soon as you populate the barcodeValue variable from the request and before using it anywhere else. The rule of thumb for dealing with Null Pointer Exceptions is to make sure that you always check whether the object populated by accessing any method is null, before invoking any of its methods. Hope this helps.
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