Error uploading Plugins which don't implement Component

Seems like

Openfire 3.6.0 Alpha (not sure about other versions) have a bug with plugins which don’t implement Component.

Try to reload MotD plugin from web interface and you will see warnings in warn.log:

2008.04.28 16:32:55 Error unloading plugin genome. Will attempt again momentarily.

Interestingly that the bug doesn’t occurs then implementing Component.