Eclipse Plugin only working on my machine

I wrote a Eclipse plugin for adding hungry-deletion, and开发者_如何学运维 it appears to work on my machine. However, I had a few friends try it, and it doesn't seem to load at all on their machines. The installation process is just to copy the resulting .jar to the plugins/ subdirectory of eclipse. I've tried re-installing eclipse on my machine and installing the plugin again, and that seems to work. Is there a signing process or something I have to go through for my plugin to work on different machines? If not, what could be the issue?

Have you tried starting eclipse w/ the -clean flag?

It seems the problem is the plugin was written in Eclipse 3.6 and not working in Eclipse 3.5 installations.

try to copy the plugin not to plugins directory but to dropins