What does NoClassDefFound mean?
NoClassDefFound means "No Class Definition Found".
NoClassDefFound is an error from the JVM when it cannot find a class required to run a Java program.
This error could be caused by an actual missing class, but it is usually caused by a faulty CLASSPATH.
This error also sometimes occurs when Java users add the unnecessary .class extension to the end of their command lines:
C:\>java HelloWorld.class
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld/class
C:\>java HelloWorld
Hello World!
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