title: Exception in thread "Thread-1" NoClassDefFoundError with jar file when compiled with javac -cp "commons-lang3-3.10.jar"
body: <p>I'm receiving an error while trying to run a multi-command window server application. I'm compiling both the Client and Server with the -cp "commons-lang3-3.10.jar" file, but I continue to run into this Exception. I've attached a link to an image of the error. The program runs at first and waits to accept a client connection..., but then when I open a second command window and run my ChatClient, I get the error. I'm currently using an Ubuntu virtual machine.</p>
  
  <p><a href="https://imgur.com/a/PMntiYU" rel="nofollow noreferrer">https://imgur.com/a/PMntiYU</a></p>