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    <p>I realized what the problem was and I wanted to document it in case anyone else has the same problems.</p> <p>I was using the jython.jar file that came in the standard installation of Jython, and NOT the standalone jython.jar (the instructions at <a href="https://wiki.python.org/jython/JythonFaq/DistributingJythonScripts#Using_the_Jar_Method" rel="nofollow noreferrer">Using the Jar Method</a> mentions this, but the instructions at <a href="https://wiki.python.org/jython/JythonFaq/DistributingJythonScripts#Building_jars_-_some_samples" rel="nofollow noreferrer">Building Jars</a> do not). I am still unsure why copying the Lib/ folder of the standard installation into the jython.jar that came with that installation didn't work on my system. However, once I used the standalone jar, things started to work more smoothly.</p> <p>Additionally, I was able to get my library to work with the packaged file by doing three things in addition to the steps I laid out in my question: </p> <ol> <li><p>Exploding the standalone jython.jar and copying the folder with all of my library files into Lib, then create a new jar. This seemed to be the easiest way to include my library and allows me to package everything into a single jar.</p></li> <li><p>I discovered after reading Frank Wierzbicki's answer in <a href="https://stackoverflow.com/questions/1681849/why-does-jython-refuse-to-find-my-java-package">Why does Jython refuse to find my Java package?</a> that because I am now using the standalone jar, I could no longer use imports of the style <code>from java.awt import *</code>, instead I needed to fully specify each thing I was importing, for example <code>from java.awt.Font import PLAIN, BOLD, ITALIC</code>. So I went through the library's imports and fixed the few that were of the wrong style.</p></li> <li><p>Now that I am adding my Library directly to the Jar's Lib folder, instead of writing <code>Class-Path: ./myLibrary.jar</code> in <code>othermanifest.mf</code>, I put <code>Main-Class: org.python.util.JarRunner</code> as per Frank Wierzbicki's answer in the post I mentioned in my question: <a href="https://stackoverflow.com/questions/1252965/distributing-my-python-scripts-as-jars-with-jython">Distributing my Python scripts as JAR files with Jython?</a></p></li> </ol> <p>This allowed me to create a double-clickable executable jar containing my library and jython file that I wanted to run.</p>
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