Are you running the jemplode jar directly? if so, try running it:
java -Xmx128M -jar jemplode.jar

If you're running the app bundle, then I need to look, but in one of the properties files you should be able to specify the max memory that can be used by the VM ... Jack that up if you find it.

By default it will only get 64M of RAM max, which maybe (obviously) is not enough to handle a db of that size ... Surprising though. Do you have a lot of soups? Soups eat memory, I think (and processor at least initially)

ms