When the class is declared in a package like com.acme.example, Then you really have to use the complete classname which include This solution is for rescuing beginner Java programmers within the stress brought on by a common mistake. I recommend you study the acknowledged reply For additional in depth understanding https://arthuriljie.blogcudinti.com/33891860/the-fact-about-power-supply-uninterruptible-that-no-one-is-suggesting