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    Look if your classpath is correct, and check if the versions of your libraries match the version you described in your pom.xml

Solutions on the web

via Coderanch by Davinderpro java, 1 year ago
Beersong (wrong name: chap01/BeerSong)
via Stack Overflow by Leon
, 2 years ago
PhraseOMatic (wrong n ame: chap01/PhraseOMatic)
via by Unknown author, 2 years ago
hellouser (wrong name : HelloUser)
via by Unknown author, 2 years ago
java.lang.NoClassDefFoundError: Beersong (wrong name:
 chap01/BeerSong)	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(	at	at	at$100(	at$	at$	at Method)	at	at java.lang.ClassLoader.loadClass(	at sun.misc.Launcher$AppClassLoader.loadClass(	at java.lang.ClassLoader.loadClass(	at sun.launcher.LauncherHelper.checkAndLoadMain(