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After some research I managed to successfully print my precious QR Code!
To achieve this I did the following steps:
1 - Download and copy de file
serializer-2.7.1.jar to the folder:
/var/lib/tomcat/webapps/JasperReportsIntegration/... on the server.
Hi, did you manage to solve your problem?
I copied the serializer-2.7.1.jar file into the /var/lib/tomcat/webapps/JasperReportsIntegration/WEB-INF/lib folder and the error message no longer appears, but neither does the QR Code.