Check what version of jasperreports_extension.properties you are using in you fat jar I used to have same problems and running an older jasperreports_extension.properties with no net.sf.jasperreports.extension.registry.factory.repository Reason for me was assembly/fatjar jasperreports-font.4.0.0.jar and jasperreports.5.0.0.jar. First and old version replacing new one.