I am making a mod with keybinds and this ability is not working and basically it is if you have an item you deal damage and explode the nearest entity but it no work.... 

        @SubscribeEvent
        public static void onKeyInput(InputEvent.Key event) {
            Player player = Minecraft.getInstance().player;
            // EXPLOSION BARRAGE
            if (Keybinding.EXPLOSION_BARRAGE_KEY.consumeClick()) {
                if (player != null) {
                    ItemStack itemToCheck = new ItemStack(ItemInit.EXPLOSION_POWER_CHARM.get());

                    boolean hasItem = false;
                    for (int slot = 0; slot < player.getInventory().getContainerSize(); slot++) {
                        ItemStack stack = player.getInventory().getItem(slot);
                        if (stack.getItem().equals(itemToCheck.getItem()) && ItemStack.tagMatches(itemToCheck, stack)) {
                            hasItem = true;
                            break;
                        }
                    }
                    if (hasItem) {
                        Level world = Minecraft.getInstance().level;
                        assert world != null;
                        List<Entity> entities = world.getEntities(player, player.getBoundingBox().inflate(16.0));
                        entities.removeIf(entity -> entity == null);
                        Entity nearestEntity = entities.stream().min(Comparator.comparingDouble(entity -> entity.distanceToSqr(player))).orElse(null);
                        int explosionCount = 10;
                        float explosionPower = 1.0f; // Adjust the explosion power as needed
                        double damageAmount = 0.8; // Adjust the damage amount as needed

                        for (int i = 0; i < explosionCount; i++) {
                            world.explode(player, nearestEntity.getX(), nearestEntity.getY()+0.7, nearestEntity.getZ(), explosionPower, Explosion.BlockInteraction.NONE);
                            nearestEntity.hurt(DamageSource.explosion(player).bypassArmor(), (float) damageAmount);
                        }
                    }
                }
            }}

 

You can't hurt players or cause explosions on the client: https://forge.gemwire.uk/wiki/Sides

Or you can, but anything it does will be "optical illusion" because the server doesn't know anything about it. It won't affect the real state, get saved or be seen by other players.

 

You need to send a network packet to the server and let it do the work. https://forge.gemwire.uk/wiki/SimpleChannel

 

If you just used the normal Item.use() - i.e. right click - you wouldn't have to worry about "re-inventing the wheel".