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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 Oracle Community by 843802, 2 years ago
helloworldapp (wrong name: HelloWorldApp)
via Coderanch by Kevin Brennan, 1 year ago
helloworldapp (wrong name: HelloWorldApp)
via Google Groups by Unknown author, 8 months ago
HelloWorldApp (wrong name: thufir/bonjour/HelloWorldApp)
via Google Groups by yawnmoth, 2 years ago
Test (wrong name: test)
via Oracle Community by 807606, 10 months ago
via Oracle Community by 807600, 9 months ago
java.lang.NoClassDefFoundError: helloworldapp (wrong
 name: HelloWorldApp)	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(Unknown Source)	at java.security.SecureClassLoader.defineClass(Unknown Source)	at java.net.URLClassLoader.defineClass(Unknown Source)	at java.net.URLClassLoader.access$100(Unknown Source)	at java.net.URLClassLoader$1.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClassInternal(Unknown Source)