Examine command line and / or the CLASSPATH setting variable which is in effect whenever you operate the java command. Check which the directory names and JAR file names are correct. Unstable power might not matter A lot when working with an incandescent mild bulb or a space heater. But https://landen02ih4.elbloglibre.com/33772937/the-ultimate-guide-to-ups-uninterruptible-power-supply