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Type:
Bug
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Resolution: Fixed
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Priority:
Minor
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None
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Affects Version/s: None
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4438-Spigot-d421948-ade46cc
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Yes
Using a mod called [Inventory Essentials|https://modrinth.com/mod/inventory-essentials] (in my test cases fabric version 21.4.3 [at the time of writing the latest]), which provides "a few inventory control enhancements that have initially been introduced in mods like Inventory Tweaks and Mouse Tweaks" can halt the server when a PlayerDropItemEvent is cancelled when using the Control+Shift+Drop enhancement.
According to this issue] all the mod does is "emulate Vanilla slot clicks".
The server appears to get caught in an infinite loop which I cannot replicate on other server software, only on Spigot.
Reproduction steps:
1. Install Fabric or (Neo)Forge and install the Inventory Essentials Mod.
2. Create a (or use the provided) plugin which simply denies the ability to drop items without the player sneaking.
public class TestPlugin extends JavaPlugin implements Listener { @Override public void onEnable() { getServer().getPluginManager().registerEvents(this, this); } @EventHandler public void onItemDrop(final PlayerDropItemEvent event) { if (!event.getPlayer().isSneaking()) { event.setCancelled(true); } } }
3. Launch a server with the plugin installed.
4. Obtain any item and attempt to drop it using Control + Shift + <Your Drop Key>
5. The server should hang before eventually exiting for running too far behind.
[SPIGOT-8010] 'Control+Drop' When Denied Halts Server
Quick update to this:
This may be caused by attempting to drop a full stack of items instead of what I originally thought of as the mod attempting to drop an item multiple times.
In the provided video I am playing on a Vanilla client on a Spigot 4439 server with the same plugin as provided above. Strangely enough this only occurs while dropping the items from the inventory and while in survival.
ItsSchatten
added a comment - Quick update to this:
This may be caused by attempting to drop a full stack of items instead of what I originally thought of as the mod attempting to drop an item multiple times.
In the provided video I am playing on a Vanilla client on a Spigot 4439 server with the same plugin as provided above. Strangely enough this only occurs while dropping the items from the inventory and while in survival.
https://www.youtube.com/watch?v=OFDouOR9agE All comments
Quick update to this:
This may be caused by attempting to drop a full stack of items instead of what I originally thought of as the mod attempting to drop an item multiple times.
In the provided video I am playing on a Vanilla client on a Spigot 4439 server with the same plugin as provided above. Strangely enough this only occurs while dropping the items from the inventory and while in survival.
ItsSchatten
added a comment - Quick update to this:
This may be caused by attempting to drop a full stack of items instead of what I originally thought of as the mod attempting to drop an item multiple times.
In the provided video I am playing on a Vanilla client on a Spigot 4439 server with the same plugin as provided above. Strangely enough this only occurs while dropping the items from the inventory and while in survival.
https://www.youtube.com/watch?v=OFDouOR9agE 
Resolved in 4440