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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 Nick de Waal, 1 year ago
GameLauncher (wrong name: com/headfirst/game/GameLauncher)
via Stack Overflow by Carl Persson
, 2 years ago
Game (wrong name: game/Game)`
via Stack Overflow by David Hackro
, 1 year ago
Iddk2000Main (wrong name: com/iritech/demo/Iddk2000Main)
via journaldev.com by Unknown author, 1 year ago
ExceptionInMain (wrong name: com/journaldev/util/ExceptionInMain)
via davidcrowley.me by Unknown author, 1 year ago
java.lang.NoClassDefFoundError: GameLauncher (wrong name: com/headfirst/game/GameLauncher)	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:791)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)	at java.net.URLClassLoader.access$100(URLClassLoader.java:71)	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:480)