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How to make data 'visible' to all players


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I am doing something similar to iChun's Hats mod where players can unlock titles by completing achievements. Using a gui they can choose which of their available titles will be displayed in their name tag.

 

The issue I am encountering is that the arraylists that store which players have unlocked which titles is not visible to players who join through LAN (thus I guess also those who join an actual server). I understand the issue I have involves communicating between client and server, but I don't know how to approach it. Any insight would be appreciated, even if it's a mod that provides a simple example.

 

The link to the code is here: https://github.com/Aurilux/Titles. It also uses some classes from my core library which is here: https://github.com/Aurilux/ArdentCore.

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Alright, so I did already look at that tutorial (plus a few others) before I posted this but I decided to take another look at it just in case. As I understand it, packets are only necessary when data changes and not when data needs to be retrieved/accessed. All of my packets function properly. I used println's to verify that they are triggered correctly at all phases, yet it still doesn't work. I imagine my issue now is not marking a function with @SideOnly(Side.CLIENT) or the place were my data is stored for some reason is just not on the server. I've tried moving it to CommonProxy but that didn't have any effect. Could someone explain where variables should be (in specific classes?) so that they can be accessed by each client?

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