 <p>It looks like Tattletale was not able to read my war. It may be because it was created for Tomcat 7.</p> <p>I exploded the war to a directory with the "jar xvf" command and reran the same command on that folder:</p> <pre><code>java -Xmx512m -jar tattletale.jar myapp report </code></pre> <p>This created all of the reports. I was most interested in the "unused jar" report, and I can see that it is incorrectly reporting some jars as unused, but I have gotten past my initial hurdle.</p>