ERROR - java.lang.ClassNotFoundException - Possible Causes of ClassNotFoundException

Exception Thrown By:Cause
MimeType public void
readExternal(ObjectInput in)
If the class for
an object being restored cannot be found.
ParserFactory public static Parser
makeParser(String className)
The SAX parser class was
not found (check your CLASSPATH).
UIManager public static void
setLookAndFeel(String className)
if the LookAndFeel
class could not be found.