BungeeCord | Efficiently proxies | Plugin library

Right now I have

I'm making a minecraft plugin for my minecraft server but I have an error that I can't found the solution. The context: I want to store the data of a player like level/xp/rank etc... Can you help me to do this part of the plugin, I'm a beginner in Java.

This is my code :

I'm trying to get user with uuid but an error pops up and says this:

non-static method getUserManager() cannot be referenced from a static context

I tried to place it in a different method and call that method but didn't worked, whatever I do that error still pops up. It could be because I wrote LuckPerms instead of luckPerms but I don't think so.

And here is the code (I deleted some useless stuff) I tried searching but couldn't find anything, also I've read API like 5 times and it was useless

I had database connection issues on my Java project because of mysql's replacement with mariadb on Debian 10. I am using HikariCP to connect, I updated the code so that it works with mariadb :

I was working on a bungeecord plugin, when i ran into a issue. I was working with this API , when i ran into an issue. To obtain the PlayerParty object i need to use this method

A few days ago i started with Maven. I have to put only a few of my dependencies in my generated jar file. This is needed because my code is only a plugin (Minecraft Plugin) executed by an api (Minecraft Server Software Spigot). Now the Problem is, that my Plugin depends on an other api (json-simple-1.1).

The last days i tried to edit the maven shade plugin to get the wished result. I failed, and now i did it in this way:

• maven include the json-simple-1.1 api, i needing for my plugin
• eclipse include the spigot api (Minecraft server software), which will executing my plugin

pom.xml:

I would like to edit a yaml in java , ( I'm editing BungeeCord config file to create a system that launches instance of bungeecord with a defined by user port ) but in a precise way , i need to write exactly this in the yaml file :

The bungeeCord worked perfectly last week, but in the last 2 days I'm receiving some errors. While I'm switching between 2 different internal servers, In one of them it writes the correct UUID while in the other one it randomizes it, I checked on Name MC and UUID MC to check if the UUID is registered, but only one of them is.

The problem starts when all my data goes through my database that's based on MySQL. MySQL differentiates between players using their UUID, and brings them their correct data using their UUID. But while the same player has 2 different UUID's in 2 different servers. And when he logs in to the other server, it doesn't save the data properly.

namemc-1:enter image description here

namemc-2:enter image description here

Mysql:enter image description here

So I am currently working on a multi-module project. I have worked on this project for almost a year and everything has been working fine up until recently. Everything has been able to compile except for the important piece, which is my libraries module called "Bookstore". Bookstore was compiling about a couple of days ago until IntelliJ had some updates and I went to update. Now when I go to compile my plugin I get a fat "Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project Bookstore: Compilation failure An unknown compilation problem occurred". Please help. I have tried everything. I have reinstalled java 8 and 9 JDK, added more memory, even added in the typical maven-plugin dependency to make it work. Nothing works this is how my pom looks: