Mac OS 9 does not have a recent JVM that you can download from Sun. The latest JVM that works on OS 9 is Apple's MRJ 2.5, which is based on the 1.1.8 version of the JDK. The latest version of JEmplode (at the top of the page) requires a later version of the JDK than 1.1.8.
So, I went to the Sourceforge download area and downloaded the latest MacOS version (with JVM and installer bundled) to see if I could get a previous version running, but I ran into the problem listed above. Just wondering if there is anyone still using OS 9 and JEmplode to connect to their Empegs and if they had seen this problem before.