# HopperFilter Paper plugin that adds a **hopper filter** (allowlist): when a hopper is "filtered", it can transfer only the items that match the rules configured in the GUI. - **Minecraft/Paper API**: `1.21.x` - **Java**: `21` ## Filtered Hopper modes HopperFilter supports two operational modes (configurable in `config.yml`): ### Mode A — Special hoppers (recommended) When `filtered-hopper.require-special-hopper: true`: - Only **special hoppers** (given via `/hf give`) can be configured and will apply item filtering. - Normal hoppers behave vanilla (no GUI, no filtering). - Special hopper locations are persisted in the DB table `filtered_hopper_locations` and cached in memory. - The **upgrade system** is only available in this mode. ### Mode B — Global mode When `filtered-hopper.require-special-hopper: false`: - **All** hoppers are filterable. - The special hopper location table is **not used** and there is no cache/DB overhead. - `/hf give` is disabled. - The upgrade system is disabled. ## Features - GUI to configure each hopper's filter. - **Per-item** matching rules (stored directly on the filter item via PDC): - Match Material - Match Durability - Match Name - Match NBT - Match Tag (dynamic tag selection) - **Dynamic** tag selection: shows only the Bukkit tags applicable to the selected item. - **Upgrade system** (special hopper mode): levels unlock more filter slots, faster transfer speeds, and optionally charge Vault economy. - "Hopper jam" fix: if the first item in the source chest is blocked, the plugin tries to pull the **first allowed item** instead of getting stuck. - Persistent storage (SQLite or MySQL) with connection pooling (HikariCP). - Optional Vault economy integration for upgrade costs. ## How to use (in-game) If you are in **Special hopper mode**, you must place a special hopper first: 1. `/hf give [amount]` 2. Place the received hopper. 3. Configure it as usual (SHIFT + right-click). ### 1) Open the main GUI 1. Make sure your main hand is empty. 2. Hold **SHIFT**. 3. **Right-click** a hopper. Required permissions: `hopperfilter.opengui` (open) and `hopperfilter.use` (interact). In special hopper mode, the GUI only opens on special hoppers. ### 2) Add / remove items from the filter - **Add**: left-click an item in the player inventory (bottom section). - **Remove**: right-click a filter slot (top section). The filter works as an **allowlist**: if the filter contains at least one item, only matching items are allowed through. ### 3) Configure match options (per slot) - **Left click** a filter slot to open the "Filter Item Options" GUI. Options: - **Match Material**: requires the same material. - **Match Durability**: requires the same durability/damage. - **Match Name**: compares the custom display name. - **Match NBT**: compares item meta (enchants, models, etc.). - **Match Tag**: allows matching by a Bukkit tag (e.g. all planks). ### 4) Tag selection When you enable **Match Tag**, open the tag selector to pick one of the tags applicable to that item's material. Disable with the "Disable Tag Matching" button. ### 5) Upgrades (special hopper mode only) - **Left-click the upgrade button** in the GUI (bottom-right corner) to upgrade the hopper to the next level. - Each level unlocks more filter slots and/or a faster transfer speed. - If Vault is enabled, the cost shown in the button is charged on upgrade. Required permission: `hopperfilter.upgrade` ## Commands Main command: `/hopperfilter` — alias: `/hf` | Subcommand | Description | Permission | |---|---|---| | `reload` | Reload config and lang | `hopperfilter.admin.reload` | | `info` | Look at a hopper (≤6 blocks) to see if it is filtered | `hopperfilter.admin.info` | | `clear` | Look at a hopper (≤6 blocks) and clear its filter | `hopperfilter.admin.clear` | | `give [amount]` | Give a special Filtered Hopper (max 64). Disabled in global mode. | `hopperfilter.admin.give` | | `maxupgrade ` | Upgrade all filtered hoppers owned by a player to max level | `hopperfilter.giveupgrades.max` | | `upgraderadius ` | Upgrade all filtered hoppers within `` blocks of you to max level (max 500) | `hopperfilter.giveupgrades.max` | > **Note on `maxupgrade`**: hoppers placed before owner-tracking was added have no owner data and will not be affected. Use `upgraderadius` for those. ## Permissions | Permission | What it does | Default | |---|---|---| | `hopperfilter.opengui` | Open the filter GUI | op | | `hopperfilter.use` | Interact with the GUI (add/remove/configure items) | op | | `hopperfilter.break` | Break actively-filtered hoppers (must sneak) | op | | `hopperfilter.upgrade` | Upgrade a hopper via the GUI | op | | `hopperfilter.admin.reload` | `/hf reload` | op | | `hopperfilter.admin.info` | `/hf info` | op | | `hopperfilter.admin.clear` | `/hf clear` | op | | `hopperfilter.admin.give` | `/hf give` | op | | `hopperfilter.giveupgrades.max` | `/hf maxupgrade` and `/hf upgraderadius` | op | ### Note (breaking special filtered hoppers) - The sneak+permission check applies only when the hopper has an **active filter**. - In special hopper mode, breaking a special hopper drops a special hopper item (preserves name/lore/PDC), so it can be reused. ## Configuration Files are created under `plugins/HopperFilter/`: - `config.yml` - `lang.yml` ### config.yml **Storage** | Key | Description | Default | |---|---|---| | `storage.type` | `sqlite` or `mysql` | `sqlite` | | `storage.sqlite.file` | DB filename (inside the plugin folder) | `filters.db` | | `storage.mysql.host` | MySQL host | `127.0.0.1` | | `storage.mysql.port` | MySQL port | `3306` | | `storage.mysql.database` | Database name | `hopperfilter` | | `storage.mysql.username` | Username | `whatever` | | `storage.mysql.password` | Password | `please-change-me-im-scared` | | `storage.mysql.useSSL` | SSL | `false` | | `storage.mysql.parameters` | Extra JDBC parameters | `useUnicode=true&...` | | `storage.pool.maximumPoolSize` | Max pool size (SQLite is forced to 1) | `10` | | `storage.pool.minimumIdle` | Min idle connections | `2` | | `storage.pool.connectionTimeoutMillis` | Connection timeout (ms) | `10000` | **Filter** | Key | Description | Default | |---|---|---| | `filter.size` | Filter GUI size (multiple of 9, max 54) | `54` | | `tnt.blockedRadius` | TNT placement blocked radius around filtered hoppers | `5` | **Special hopper** | Key | Description | Default | |---|---|---| | `filtered-hopper.enabled` | Enable the filtered-hopper feature | `true` | | `filtered-hopper.require-special-hopper` | `true` = only special hoppers filter; `false` = all hoppers filter | `true` | | `filtered-hopper.accept-name-lore-fallback` | Also recognize filtered hoppers by matching name+lore (for shop plugins that can't set PDC tags) | `false` | | `filtered-hopper.name` | Display name of the special hopper item | `§6Filtered Hopper` | | `filtered-hopper.lore` | Lore lines of the special hopper item | `§7This hopper can filter items.` | | `filtered-hopper.give-message-sender` | Message shown to the command sender on `/hf give` | `§aGiven {amount}x ...` | | `filtered-hopper.give-message-receiver` | Message shown to the receiver on `/hf give` | `§aYou received {amount}x ...` | **Upgrades** (only active when `filtered-hopper.require-special-hopper: true`) | Key | Description | Default | |---|---|---| | `upgrades.enabled` | Enable the upgrade system | `true` | | `upgrades.vault-required` | Charge Vault economy for upgrades. If `false`, upgrades are free. | `true` | | `upgrades.max-level` | Maximum upgrade level | `10` | | `upgrades.levels..cost` | Currency cost to reach level `n` (level 1 = no cost) | — | | `upgrades.levels..filter-slots` | Number of active filter slots at level `n` | — | | `upgrades.levels..transfer-speed-ticks` | Ticks between item transfers at level `n` (vanilla = 8; lower = faster) | — | Default level table (can be fully customized): | Level | Cost | Filter slots | Speed (ticks) | |:---:|---:|:---:|:---:| | 1 | 0 | 3 | 16 (half vanilla) | | 2 | 1 000 | 5 | 14 | | 3 | 2 000 | 7 | 11 | | 4 | 3 000 | 10 | 9 | | 5 | 4 000 | 12 | 8 (vanilla) | | 6 | 5 000 | 18 | 8 | | 7 | 6 000 | 25 | 8 | | 8 | 7 000 | 32 | 8 | | 9 | 8 000 | 43 | 6 | | 10 | 10 000 | 53 | 4 (2× vanilla) | ### lang.yml Contains all plugin texts (GUI titles, tooltips, messages, command replies). Fully customizable. ## Storage The plugin uses 2 tables: - `hopper_filter_items`: stores the filter contents per hopper location. - `filtered_hopper_locations`: stores special hopper locations, their upgrade level, and owner UUID (only used when `require-special-hopper: true`). When `require-special-hopper: false`, `filtered_hopper_locations` is not queried or maintained. ## Installation 1. Build or download the jar. 2. Place the jar in the server `plugins/` folder. 3. Start the server (or run `/hf reload`). 4. Configure permissions and, optionally, the database and upgrade costs. **Optional**: install [Vault](https://www.spigotmc.org/resources/vault.34315/) and an economy plugin (e.g. EssentialsX) to enable upgrade costs. JAR variants: - **Default jar** (`HopperFilter-x.y.z.jar`): embeds HikariCP; Paper downloads the remaining runtime libraries declared in `plugin.yml`. - **`*-thin.jar`**: no embedded deps; Paper downloads everything. - **`*-all.jar`**: fully shaded; no internet required at startup. ## Build & Dev Requirements: - JDK 21 - Gradle (this repo does not include a Gradle wrapper) Useful tasks: | Task | Description | |---|---| | `gradle shadowJar` | Build the default jar (embeds HikariCP) | | `gradle shadowAllJar` | Build the fully shaded jar | | `gradle build` | Build all variants | | `gradle runServer` | Start a local Paper server with the plugin loaded | Output goes to `build/libs/`. ## Troubleshooting - **"DB error …"**: check `storage.type` and connection parameters. For MySQL, verify that the database exists and credentials are correct. - **Filter doesn't persist**: make sure the server has write access to `plugins/HopperFilter/`. - **Can't open the GUI**: you need `hopperfilter.opengui`, an empty main hand, and must be sneaking. - **Can open but can't interact**: you need `hopperfilter.use`. - **Upgrade button missing**: upgrades require `filtered-hopper.require-special-hopper: true` and `upgrades.enabled: true` in `config.yml`. - **Economy not charging**: check that Vault and an economy plugin are installed and that `upgrades.vault-required: true`. - **`maxupgrade` reports 0 hoppers**: hoppers placed before v3.0.0 have no owner data. Use `/hf upgraderadius` to upgrade by proximity instead. - **Special hopper stops working after breaking**: make sure you are running the correct jar version; special hoppers should drop as special items (with lore/PDC) when broken. --- Website/author: `italiarevenge.com` / Anomalyforlife --- ## Special Thanks Special thanks to the users:

bmlzootown (Issue #1)

DJRikyu Collaboration

Published on	May 7, 2026
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hopperfilter

Release 3.3.2

Anomalyforlife released hopperfilter version 3.3.2 on May 7, 2026

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3.3.2