Posted June 25, 20178 yr In previous versions of Minecraft, it was possible to create a handler for ItemTooltipEvent in common code without crashing the dedicated server as long as you didn't reference any client-only classes. In 1.12, ItemTooltipEvent now references the client-only ITooltipFlag, which crashes the dedicated server with a ClassNotFoundException when you create a handler for the event in common code (unless you mark the handler method as client-only). I suggest moving the event to a client package or at least mentioning that it's client-only in the doc comment. Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.
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