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public static PLUGIN_NAME instance;
Then in your onEnable() Make sure it's the first line in there! -
Code (Text):
instance=this;
So now in all of your classes, you can use PLUGIN_NAME.instance.getConfig()

If you ever need to get config's of another plugin (Like when i was shrinking my world border and needed to check if there were player homes that would be beyond the new one), you can use this method -
Code (Text):
Bukkit.getPluginManager().getPlugin("PLUGIN_NAME").getConfig()