When The category is declared within a package for instance com.acme.example, You then have to use the complete classname including all classes and interfaces in the superclass hierarchy (e.g. see Java class is current in classpath but startup fails with Error: Couldn't obtain or load major class) The purpose of https://preechaconcretepile58148.suomiblog.com/ups-uninterruptible-power-supply-can-be-fun-for-anyone-49440350