Porque esse erro?
net.sourceforge.barbecue.BarcodeException: a is not a valid character for Standard 2 of 5 encoding
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Tue Jun 04 16:41:37 BRT 2019
There was an unexpected error (type=Internal Server Error, status=500).
Error creating barcode.