java.lang.Object | +----java.lang.Throwable | +----java.lang.Error | +----java.lang.LinkageError | +----java.lang.NoClassDefFoundError
public class NoClassDefFoundError
extends LinkageError
Thrown if the Java Virtual Machine or a classloader tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.
The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.