If you are using Red Hat 7.2 and use the default shell, I believe is bash, don't use braces with the $CLASSPATH variable. That won't work.
Please do the following:
% javac -classpath $CLASSPATH:AdviceAppClient.jar AdviceClient.java
%
java -cp $CLASSPATH:AdviceAppClient.jar AdviceClient
=====================================<br />John Liang<br />SCJP2 1.4, SCWCD, SCBCD<br />Working on: WebLogic Architect, IBM Certified Enterprise Developer and Sun Certified Enterprise Architect