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the LESSER GPL
You missed the LGPL (v2). Forge uses it, Linux does, ... so you can at least mention it, as it is the most popular.
But EntityPlayer#asBukkitEntity or so is a thing
A binary file, with 1 byte blockid 1 byte data
First you need a mathematical description for that shape. This is the hard part, we cant/wont help you. Realising this with Bukkit is minor work...
Most of the time there is one, but sometimes deprecated methods are the only option
Why do you remind him? I dont think he broke any rules..
In fact, there is a method to draw an image onto that canvas.
Its MapCanvas#drawImage. If your image is 128*128 (which I suggest) then just use...
If you have Intellij just create a new run profile that starts your spigot.jar and profit. No need to include some weird plugin.
If you are not...
The int is boxed into an object (java.lang.Integer) which is then tried to set to an int field, what obviously does not work. So use setInt() to...
The server is probably looking for that entity you clicked, not finding it and therefore not throwing that event as there is no value to populate...
Wolfram alpha is your friend:
What error is reported? Or does it just fail silently?
you apparently can download the spigot.jar, why don't you upload a new one.
First hint: Java is 0-based, so your first entry is get(0).
But please post your whole code if that does not help you, and also mark im what line...