Offline Mode crashing instances on bad/slow connection

[Squaredude]

System Information

MultiMC version: 0.6.1-1177

Operating System: Windows 7 64 bit

Summary of the issue or suggestion:

In versions previous to 0.6.x, launching Offline Mode did not require to be offline. Now, launching this mode with a slow (<10kB/s) connection causes the instance to crash.

What should happen:

Offline Mode should not allow Minecraft to connect to the Internet, even if there is a connection available.

Steps to reproduce the issue (Add more if needed):

1. Connect to the Internet using a bad connection (I have a mobile connection due to lack of proper ISP)

2. Launch Minecraft on Offline Mode

3. Watch the log on MultiMC: there are calls which cripple the instance because they timeout.

Suspected cause:

Maybe the new way of handling the libraries is somehow interfering, or maybe there is no proper implementation of this change in Offline Mode. No idea. All I know is that this did not happen with 0.5.x versions of MultiMC, and as soon as I updated it, I could no longer use this feature.

Logs/Screenshots:

Additional Info:

[peterix]

Is it MultiMC timing out and failing, or is it the game itself?

Can you show me the logs?

[Squaredude]

The time outs were not consistent at one particular point. Probably because my connection is a limited mobile one, and sometimes the service is overwhelmed. Sometimes it happens as the game is initializing. Sometimes it happens before the game is opened. Sometimes it happens as it's loading Forge mods. Sometimes it crashes back to MultiMC on its own, sometimes I have to kill the process through MultiMC. But it always happens right after I launch the game in Offline Mode.

MultiMC never freezes or crashes, though.

I had to downgrade to MultiMC 0.5.x, because I'm on limited data and can't keep wasting what I have left for the rest of the month. As I said before, this version does not time out when launching Minecraft in Offline Mode, nor does it ask to download libraries again.

From what I can remember from the logs, sometimes I'd see the timeout as a Java exception (Http, but I can't remember the complete namespace). Some of the more fatal crashes involved trying to connect to servers to download libraries as soon as I clicked on "Launch Offline" and after confirming the nickname (red text on black background). This is why I think the new version has some issue with Offline Mode and the new way of handling libraries that was announced on the changelog.

[peterix]

Hmmm... I really can't replicate such a problem here. In offline mode, it doesn't show any network activity in the log.

I need logs, or at least something that demostrates the problem and can be replicated on my end.

EDIT:
Also, what happens inside the game is entirely out of my control.

[Squaredude]

The problem is during the loading of the game by MultiMC, not during the game. And since it's something that happens in 0.6.x and not 0.5.x, it's clearly a problem in MultiMC.

Since I downgraded, I cannot give you logs. I'll just keep using this version, then.

[peterix]

Well then, that's a great way to make sure it will never be fixed!

[peterix]

Regardless, this needs further investigation anyway.

[Arzte]

First launch on an instance that has never downloaded files for a new instance. https://paste.ee/p/KFhzS, at the very least it can be made more clear why it's crashing. I don't think this is the reason that the original poster was having issues, its worth noting that I discovered this in my initial looking into this problem. Going completly offline after the inital downloading of files also works as intended. I'm unsure as to how I can reproduce a slow and crappy network, as my closest guess on how to do that is generally ok these days (tor).

[thePalindrome]

The paste.ee log is gone, but I figured I should pop in with the same (I think) report, except this time, it's with no internet at all!

In previous versions, the download of the meta files from multimc.org would fail instantly, but now I have to wait for the TCP timeout, but only for the first pack I launch through multimc.