Event Exception (and server stops responding) when throwing ender pearls

[Amunak]

Trying out the plugin with disabled ender pearl damage I encountered this error on CraftBukkit version git-Spigot-.7.9-R0.2-207-g03373bb (MC: 1.7.10) (Implementing API version 1.7.10-R0.1-SNAPSHOT) with UHPlugin build #62 (latest as of now):

    [22:10:37 ERROR]: Could not pass event PlayerTeleportEvent to UHPlugin v1.1.2 ▒cdev▒r
    org.bukkit.event.EventException
            at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.craftbukkit.v1_7_R4.entity.CraftPlayer.teleport(CraftPlayer.java:485) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at me.azenet.UHPlugin.listeners.UHGameplayListener.onPlayerTeleport(UHGameplayListener.java:137) ~[?:?]
            at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source) ~[?:?]
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
            at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
            at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.craftbukkit.v1_7_R4.entity.CraftPlayer.teleport(CraftPlayer.java:485) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at me.azenet.UHPlugin.listeners.UHGameplayListener.onPlayerTeleport(UHGameplayListener.java:137) ~[?:?]
            at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source) ~[?:?]
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
            at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
            at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.craftbukkit.v1_7_R4.entity.CraftPlayer.teleport(CraftPlayer.java:485) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at me.azenet.UHPlugin.listeners.UHGameplayListener.onPlayerTeleport(UHGameplayListener.java:137) ~[?:?]
            at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source) ~[?:?]
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
            at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
            at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at org.bukkit.craftbukkit.v1_7_R4.entity.CraftPlayer.teleport(CraftPlayer.java:485) ~[spigot-patched.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
            at me.azenet.UHPlugin.listeners.UHGameplayListener.onPlayerTeleport(UHGameplayListener.java:137) ~[?:?]
            at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source) ~[?:?]
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_67]
            at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]

To reproduce just throw some ender pearls while playing and wait a while, you should get console full of messages like that.

[AmauryCarrade]

Ok, on my side (Spigot 1.7.10) the server stops responding when I throw an ender pearl with damages disabled, without exception.

Log here.

CraftBukkit version git-Spigot-1551 (MC: 1.7.10) (Implementing API version 1.7.10-R0.1-SNAPSHOT).
Plugins (5): WorldBorder, PTweaks, ProtocolLib, SpectatorPlus (latest dev version), UHPlugin (latest dev version).

I'll investigate soon (I cannot work on the plugin today, I will be able to soon). Thanks for your report.

[Amunak]

oh, interesting. I tried looking into the code what could be causing it but didn't find anything suspicious. I also asked the guys over on Quakenet at #spigot just to make sure it's the plugin and not spigot causing it, and apparently it must be the plugin.

My plugins are (9): WorldBorder, WorldEdit, ProtocolLib, PermissionsEx, NoCheatPlus, TelePlusPlus, SpectatorPlus, TagAPI, UHPlugin; the majority would be latest dev builds.

Oh, did I say it's awesome? Your UHC plugin is awesome.

[AmauryCarrade]

I tried looking into the code what could be causing it but didn't find anything suspicious.

I tried that too, without any obvious cause found.

I also asked the guys over on Quakenet at #spigot just to make sure it's the plugin and not spigot causing it, and apparently it must be the plugin.

Thanks for that.

Oh, did I say it's awesome? Your UHC plugin is awesome.

Thanks! :)

[AmauryCarrade]

FOUND.

    /**
    * Used to disable enderpearl damages (if needed).
    *
    * @param ev
    */
    @EventHandler(ignoreCancelled = true)
    public void onPlayerTeleport(final PlayerTeleportEvent ev) {
        if(p.getConfig().getBoolean("gameplay-changes.disableEnderpearlsDamages")) {
            if(ev.getCause() == TeleportCause.ENDER_PEARL) {
                ev.setCancelled(true);
                ev.getPlayer().teleport(ev.getTo(), TeleportCause.ENDER_PEARL);
            }
        }
    }

If I teleport a player with the tag TeleportCause.ENDER_PEARL, it will fire a PlayerTeleportEvent event with the cause TeleportCause.ENDER_PEARL. This event will be caught by my event. Re-firing a PlayerTeleportEvent with the cause TeleportCause.ENDER_PEARL. And... Infinite loop.

---

Introduced by e2bf107 (18 August).