Will debugging/running be available through eclipse?

[IDragonfire]

I hope so, sk89q also used a “on the fly develop” mechanism:

I think Sponge needs a scripting language

We might add some official scripting languages very much later on, but it’s not on the table at the moment. Also, Java has excellent debugging facilities where you can set breakpoints, inspect the state of variables, etc. Heck, if you are/were developing Bukkit plugins in your IDE, you never even had to compile your plugin or build a plugin .jar. Just hit run and you’re in business. Even reload your Java code changes without having to restart the server or your plugin. [IDEA]