Getting a 'NoClassDefFoundError' message

[Vance Arocho]

Hello, all. I'm running version 2.3.4, and have been trying to run a JMS
test plan, but I've been getting a 'NoClassDefFoundError' message, even
though I've added the directory containing the application's WAR file to
the classpath within the JMeter GUI. Any ideas as to how to resolve
this? Do I just need to re-create the WAR file as a JAR file, and update
the classpath to include the JAR file?