Minepacks Update - Crash-Safe Backpack Saving / Anti-Dupe Improvements

This update focuses heavily on backpack data safety, especially in cases where the server runs out of disk space, SQLite fails to write, or the server shuts down while backpacks are open.

A previous issue could allow a backpack item duplication scenario if a player removed an item from their backpack, the database failed to save, and the server later loaded the older backpack state again. This update adds multiple layers of protection to prevent that.

Changes

• Added crash-safe backpack saving
  Backpack saves now report whether they succeeded or failed instead of silently logging errors.
  
• Added storage failure protection
  If the plugin detects a serious database/storage failure, backpacks are automatically locked to prevent further editing until the server storage issue is fixed.
  
• Added anti-dupe rollback protection
  When a player opens an editable backpack, the plugin now snapshots:
  • Backpack contents
  • Player inventory contents
  • Armor contents
  • Offhand item
  • Cursor item
  If saving fails when the backpack closes, the player and backpack are rolled back to the safe pre-edit state.
  
• Improved SQLite save handling
  Backpack saves now use safer transaction handling with rollback support if a database write fails.
  
• Improved disk-full / database-error handling
  The plugin now detects common storage failure cases such as:
  • Database or disk full
  • SQLite full errors
  • Disk I/O errors
  • Readonly database errors
  • No space left on device
• Fixed unsafe dirty-state handling
  Backpacks are no longer marked as saved unless the database save actually succeeds.
  
• Fixed backpack close saving
  Backpack contents are now properly handled when the inventory closes, including custom-title backpack inventories.
  
• Fixed custom-title inventory syncing
  When a backpack is opened with a custom title, changes are now copied back into the real backpack inventory before saving.
  
• Added protection against multiple editable viewers
  Only one player can edit the same backpack at a time, preventing conflicting edits and unsafe save states.
  
• Improved read-only backpack protection
  Read-only viewers are prevented from modifying backpack contents through clicks or drags.
  
• Improved shutdown safety
  Open backpacks are closed before database shutdown so the latest inventory state can be processed before saving.
  
• Improved cache unloading safety
  Backpacks are no longer unloaded from memory if their save fails.
  
• Improved corrupted-data safety
  Backpack deserialization failures no longer silently create an empty backpack, preventing accidental data loss.
  
• Improved inventory detection
  Backpack inventories are now detected more safely using the inventory holder, reducing issues with unregistering inventories while multiple viewers are involved.
  
• Improved backpack resizing safety
  Backpack resizing now clones existing contents and only replaces the cached backpack after the resized backpack has been saved successfully.

Why this update matters

This update is mainly designed to protect servers from item duplication caused by failed database writes.

If the server storage becomes full or SQLite cannot save backpack data, the plugin now fails safely instead of allowing players to continue editing backpacks with unsaved changes.

Recommended after updating

• Make sure your server has enough free disk space.
• Check your console for any SQLite or storage-related errors.
• Restart the server after installing the update.
• If backpacks are locked, fix the storage/database issue and restart the server.

Summary

This is a stability and safety update focused on preventing backpack-related item duplication during database, disk space, or shutdown failures.

Please consider leaving a good review for the plugin.
Discord Support

Read the description please!

If you don't care about transferring databases then only use the MinepacksStable.jar and delete the rest.

[Reupload, I forgot the two jars needed for the convert]

1.1 version update.
- Made sure the backpack works correctly for bedrock players.
- Added the backpack.use permission to be enabled by default.

Please consider leaving a good review for the plugin.
Discord Support

Read the description please!

If you don't care about transferring databases then only use the MinepacksStable.jar and delete the rest.

1.1 version update.

- Made sure the backpack works correctly for bedrock players.
- Added the backpack.use permission to be enabled by default.

Please consider leaving a good review for the plugin.
Discord Support

Read the description please!

If you don't care about transferring databases then only use the MinepacksStable.jar and delete the rest.

Please consider leaving a good review for the plugin.
Discord Support