public class Test extends JavaPlugin implements Listener {
    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
    }

    private boolean wander = true;
    private boolean cancelJump = false;
    private boolean cancelPathfind = false;

    @EventHandler
    public void on(SlimeJumpEvent event) {
        if (cancelJump) {
            event.setCancelled(true);
        }
    }

    @EventHandler
    public void on(EntityPathfindEvent event) {
        if (event.getEntity().getType() != EntityType.SLIME) {
            return;
        }

        if (cancelPathfind) {
            event.setCancelled(true);
        }
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        Player player = (Player) sender;
        if (args[0].equalsIgnoreCase("wander")) {
            wander = !wander;
            player.getLocation().getWorld().getNearbyEntitiesByType(Slime.class, player.getLocation(), 20)
                    .forEach(slime -> slime.setCanWander(wander));
            sender.sendMessage("Can Wander: " + wander);
        }

        if (args[0].equalsIgnoreCase("jump")) {
            cancelJump = !cancelJump;
            sender.sendMessage("Cancel Jump Event: " + cancelJump);
        }

        if (args[0].equalsIgnoreCase("pathfind")) {
            cancelPathfind = !cancelPathfind;
            sender.sendMessage("Cancel Pathfind Event: " + cancelPathfind);
        }
        return true;
    }
}