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[Solved] [1.12] "NoClassDefFoundError" when launching Server

AleMax

By AleMax
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AleMax Tree Puncher

AleMax

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Posted (edited)

Hello everybody,

I recently started making a small Mod for me and a friend which we can use on our server.

So far everything is working out well when I test the Mod in an Single-Player environment, but when i started it as a Server, i got a crash and a NoClassDefFoundError referencing the ICustomModelLoader class.

I know that this class is "Single-Player-only" so im wondering where exactly the Server tries to acces it. I looked through my code but couldnt exactly figure out where, I also googled for similar errors but havent found one close to this and thus didnt find good advice. I also think that i didnt use any !world.isRemote() so far, could it possibly be an error with this? I wanted to implement those later, but to be honest, i dont even exactly know when and when not i have to do this.

The error message im getting is rather long as well, so I dont know wether I only have one error, which is causing all the others, or wether I have multiple ones I have to fix.

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If you want to check my source code you can do this here.

If some code is familiar for you, this is propably because I just plainly copied a bit of tutorials, but like I said, I dont want to make a big mod or something, just for me and a friend.

Any help and advice is welcomed.

Thank you in advance,  AleMax

Edited by AleMax
CAS_ual_TY Stone Miner

CAS_ual_TY

Posted
Posted

- Check your common proxy for that import

- Make sure a common class does not access a method statically of a class which imports client only stuff

 

These are cases that can happen quickly and without intention (through human error or sometimes when IDEs do stuff) and I have seen them a couple of times already.

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https://github.com/CAS-ual-TY/Visibilis

[1.14] How to Villagers, Trades, Professions, Fix Trades

https://minecraft.curseforge.com/projects/gun-customization-infinity / https://github.com/CAS-ual-TY/GunCus

https://minecraft.curseforge.com/projects/ygo-dueling-mod

https://minecraft.curseforge.com/projects/mundus-magicus

https://minecraft.curseforge.com/projects/deuf-duplicate-entity-uuid-fix

AleMax Tree Puncher

AleMax

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  On 8/22/2018 at 4:50 PM, diesieben07 said:

Imports are entirely irrelevant. Imports are a compiler fiction.

 

@AleMax All access to client-only classes must be encapsulated through your client proxy. For example: Your ItemTest class directly references ModelLoader. Since your ItemTest class will also be loaded on the server, this will crash.

 Moreover: Code style, issue 1.

Expand  

Thank you for the help!

I went through my classes and checked for any client-only classes, and then put those in the proxy classes directly (and deleted this nonuse test item lol)

The error log is now basicly reduced to half, but i still got the same error just with the IStateMapper class.

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The only classes which use any client only classes are the model and render classes now, should i remove them from there as well, I think that could get a bit difficult or am I doing something fundamentally wrong?

I already saw the thing with the common proxy befor posting, i will probably change it after i got this error fixed ?

I updated my Source code if you want to take a look at it. 

AleMax Tree Puncher

AleMax

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  On 8/22/2018 at 5:45 PM, diesieben07 said:

You have registered your ClientProxy class with @EventBusSubscriber without specifying a side. This effectively makes your client proxy run on a dedicated server as well. I hope you understand why this is a bad idea.

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Incredible. Thank you! Everything is working now.

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