1) ClassNotFoundException:
When we try to load a class at run-time using with Class.forName() or ClassLoader.loadClass()
or ClassLoader.findSystemClass()
method and requested class is not available.
ClassNotFoundException occurs when class loader could
not find the required class in class path. So, basically we should check our
class path and add the class in the classpath.
NoClassDefFoundError: When a class is
present during compile time but at run time the classes are changed or removed or class's static initializes threw
exceptions.
2) ClassNotFoundException
is a checked Exception derived from java.lang.Exception class and we can handle
it while NoClassDefFoundError is an
Error derived from LinkageError.
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