protected class ReaderExtensionsException.ClientException
ClientException is an exception wrapper that presents itself as a server
exception. Often, exceptions are thrown from the server to the client,
but the server's exception classes are not available on the client side.
This exception class can be made available on the client side and
presents itself as if it were the originally thrown exception. The class
name of the original exception is saved and used in the toString() method
along with the original message. The stack trace from the original
exception is copied into this exception. This is more efficient, more
convenient and more accurate than attempting to convert the original
exception's message and stack trace into a string representation.