Difference between ClassNotFoundException and NoClassDefFoundError with example

ClassNotFoundException and NoClassDefFoundError are very important concept in java and a bit confusing. This video explains the difference between them with coding example. ClassNotFoundException : -When an application tries to load a class at run time which is not updated in the class path then it occurs. -It is an exception -It occurs if class path is not updated with required JAR NoClassDefFoundError -It occurs when java runtime system failed to load a class definition which is present at compile time but missing at run time. -It is an error