NetBeans Maven Project jar file not executing - netbeans

Question

For some reason when I clean and build my maven project in NetBeans, the resulting jar file does not execute when clicked. I've tried altering the pom file several times, here is what it looks like now:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>mainWindow.java</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<distributionManagement>
<repository>
<uniqueVersion>false</uniqueVersion>
<id>corp1</id>
<name>Corporate Repository</name>
<url>file:///EGR-1L11QD2/CLS_lab/fitbir_access_project</url>
<layout>default</layout>
</repository>
</distributionManagement>
<modelVersion>4.0.0</modelVersion>
<groupId>cls.lab</groupId>
<artifactId>fitbir_access</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.24</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.200</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
</project>
My application is connected to a MySQL database, I'm not sure if that has something to do with it.
Edit: Tried to run the following line in both Administrator: Windows PowerShell and Command Prompt, both with the same error "Could not find or load main class: mainWindow.java":
java -jar fitbir_access-1.0-SNAPSHOT-jar-with-dependencies.jar
Here is MANIFEST.MF Properties:
And here is what I get when I try to open MANIFEST.MF:
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: audra
Build-Jdk: 16.0.1
Main-Class: mainWindow.java
Edit 2: Here is the file location for mainWindow.java: C:\Users\audra\OneDrive\Documents\NetBeansProjects\FITBIR\src\main\java\cls_lab\mainWindow.java
Compile classpath: C:\Users\audra.m2\repository\mysql\mysql-connector-java\8.0.24\mysql-connector-java-8.0.24.jar;C:\Users\audra.m2\repository\com\google\protobuf\protobuf-java\3.11.4\protobuf-java-3.11.4.jar;C:\Users\audra.m2\repository\com\h2database\h2\1.4.200\h2-1.4.200.jar;C:\Users\audra\OneDrive\Documents\NetBeansProjects\fitbir\target\classes
Runtime classpath: C:\Users\audra\OneDrive\Documents\NetBeansProjects\fitbir\target\classes;C:\Users\audra.m2\repository\mysql\mysql-connector-java\8.0.24\mysql-connector-java-8.0.24.jar;C:\Users\audra.m2\repository\com\google\protobuf\protobuf-java\3.11.4\protobuf-java-3.11.4.jar;C:\Users\audra.m2\repository\com\h2database\h2\1.4.200\h2-1.4.200.jar
And the boot classpath is like a page long so I won't post it unless it's necessary.
Edit 3: I changed the file locations so everything is under NetBeansProjects\fitbir (with lowercase letters), but this did not solve anything. I also changed the main class name in the pom file to cls_lab.mainWindow.java so that it is now the fully qualified class name, but I still have the same error when I run it through command prompt: Can not find or load main class.