Server JAR detection in plugins folder

[kashike]

We should properly detect server JARs that have been put in the plugins folder and ignore loading + warn that they are there.

[micah-rao]

What would be a good way to do this? My first thought was to look at the JAR manifest, but I don't know if that's the best strategy.

[jpenilla]

The vanilla server jar & paper bundler/paperclip both have a version.json file at the root of the jar. NeoForge & Fabric installers won't have those but not sure if that's in scope of the issue anyways.

[micah-rao]

That makes sense, but any thoughts on bukkit or spigot server jars?

[molor]

Why not just load only jars that contain (paper-)plugin.yml file?

[micah-rao]

Paper already does that by default, but there is no system to detect server jars in specific

[Warriorrrr]

Merged in #10228