public class KeybindMessageHandler implements IMessageHandler { @Override public IMessage onMessage(KeybindMessage message, MessageContext ctx) { EntityPlayerMP serverPlayer = ctx.getServerHandler().player; boolean keybindDown = message.keybindDown; serverPlayer.getServerWorld().addScheduledTask(() -> { serverPlayer.getCapability(KeybindProvider.capability, null).setKeybindDown(keybindDown); }); Main.logger.warn("SERVER SIDE!!!!"); return null; } }