See the attached file. Unzip it and place the jar in your lib folder. Start up Lucee 5 and drop the .cfm and .cfc files in your webroot and run the index.cfm. The createObject call works fine showing that the jar is loaded and Lucee can find the classes inside of it. However, the createDynamicProxy() fails with the following error now matter where I stick the jar file.
I tested this on Lucee Express version 220.127.116.11-RC