A big thank you for all your help, after configuring the shadow plug in and running ./gradlew shadowJar, the issue was resolved. Added these to the build.gradle

plugins {
    id 'java'
    id 'com.github.johnrengelman.shadow' version '8.1.1'
}
shadowJar {
    archiveClassifier.set('')
    manifest {
        attributes('Main-Class': 'org.example.Main')
    }
}