Kord Extensions•3mo ago

ConcurrentModificationException errors

So today I finally released by bot to production, which was scary because it meant going from 3 servers to 16k servers... so of course I expected errors. This error is popping up on various places on my bot when accessing stuff from Discord. I'm using: defaultStrategy = EntitySupplyStrategy.cacheWithCachingRestFallback. This is happening in various functions that interact with Discord data in some way, in the particular stacktrace I attached, it refers to this call:

private suspend fun EventContext<MemberLeaveEvent>.onMemberLeft() {
        val world = nabBot.serverWorldMapping[event.guild.longId]
        val botMember = event.guild.selfMember()  // <-- this line
        webhookManager.sendLogMessage(event.guild) {
            // More code
        }
}

private suspend fun EventContext<MemberLeaveEvent>.onMemberLeft() {
        val world = nabBot.serverWorldMapping[event.guild.longId]
        val botMember = event.guild.selfMember()  // <-- this line
        webhookManager.sendLogMessage(event.guild) {
            // More code
        }
}

event { action { onMemberLeft() } }

event { action { onMemberLeft() } }

This is happening in many different places, with stuff that interacts with the entity supplier or with Flows.

stacktrace.txt

Solution:

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48 Replies

gdude•3mo ago

That looks like a problem with Kord, so I'll have to defer to @Kord Team Members While you wait, make sure you're using the latest KordEx snapshot and not providing your own Kord version

Unknown User•3mo ago

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SchlaubiBus•3mo ago

We should as I published 0.5.1 a few days ago

Unknown User•3mo ago

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SchlaubiBus•3mo ago

yeah I think this was largely resolved by changing it in kord, however cache doesn't change it for now

Unknown User•3mo ago

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Galarzaa•3mo ago

I will give this a try I'm actually in the 1.8.0 SNAPSHOT, tried 1.8.1, but I was getting these issues: https://canary.discord.com/channels/1121419906995458098/1252310860551028767

Unknown User•3mo ago

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gdude•3mo ago

you got that while matching the kordex build environment? is 0.5.1 not part of 0.14.0-SNAPSHOT?

Unknown User•3mo ago

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gdude•3mo ago

was there a new cycle that I missed?

Unknown User•3mo ago

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gdude•3mo ago

Oh huh, was the new cycle announced? Maybe I forgot about it

Unknown User•3mo ago

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gdude•3mo ago

That's not explicit enough imo haha But yeah, fair

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ConcurrentModificationException errors