Evaluate command line and / or maybe the CLASSPATH environment variable that may be in outcome after you operate the java command. Check which the directory names and JAR file names are right. all courses and interfaces in the superclass hierarchy (e.g. see Java course is current in classpath but https://mixedmartialarts60471.goabroadblog.com/32931326/the-smart-trick-of-uninterruptible-power-supply-ups-that-no-one-is-discussing