"NoSuchMethodError: net.minecraft.client.Minecraft.getInstance()Lnet/minecraft/client/Minecraft" Using Shadow plugin

[Tatuck]

Hello. I am trying to use an external library in my mod, so I thought I had to create a fatjar so I used Shadow Plugin. But now I think it is not compiling Minecraft library. 
This is my build.gradle:

buildscript {
    repositories {
        maven { url = 'https://files.minecraftforge.net/maven' }
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath group: 'net.minecraftforge.gradle', name: 'ForgeGradle', version: '4.1.+', changing: true
    }
}

plugins {
    id 'com.github.johnrengelman.shadow' version '6.1.0'
}

apply plugin: 'net.minecraftforge.gradle'
// Only edit below this line, the above code adds and enables the necessary things for Forge to be setup.
apply plugin: 'eclipse'
apply plugin: 'maven-publish'

version = '1.0'
group = 'com.tatuck.coordinateslocator' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
archivesBaseName = 'tatuckcoordslocator'

java.toolchain.languageVersion = JavaLanguageVersion.of(8) // Mojang ships Java 8 to end users, so your mod should target Java 8.

println('Java: ' + System.getProperty('java.version') + ' JVM: ' + System.getProperty('java.vm.version') + '(' + System.getProperty('java.vendor') + ') Arch: ' + System.getProperty('os.arch'))
minecraft {

    mappings channel: 'official', version: '1.16.5'

    runs {
        client {
            workingDirectory project.file('run')

            property 'forge.logging.markers', 'REGISTRIES'

            property 'forge.logging.console.level', 'debug'

            mods {
                examplemod {
                    source sourceSets.main
                }
            }
        }

        server {
            workingDirectory project.file('run/server')

            property 'forge.logging.markers', 'REGISTRIES'

            property 'forge.logging.console.level', 'debug'

            mods {
                examplemod {
                    source sourceSets.main
                }
            }
            setForceExit(false)
        }


        data {
            workingDirectory project.file('run')

            property 'forge.logging.markers', 'REGISTRIES'

            property 'forge.logging.console.level', 'debug'

            args '--mod', 'examplemod', '--all', '--output', file('src/generated/resources/'), '--existing', file('src/main/resources/')

            mods {
                examplemod {
                    source sourceSets.main
                }
            }
        }
    }
}

// Include resources generated by data generators.
sourceSets.main.resources { srcDir 'src/generated/resources' }



dependencies {
    minecraft 'net.minecraftforge:forge:1.16.5-36.1.0'
    compile 'org.mongodb:mongodb-driver-sync:4.2.3'
    shadow 'org.mongodb:mongodb-driver-sync:4.2.3'
    shadow 'org.mongodb:bson:4.2.3'


    // http://www.gradle.org/docs/current/userguide/artifact_dependencies_tutorial.html
    // http://www.gradle.org/docs/current/userguide/dependency_management.html

}

jar {
    manifest {
        attributes([
                "Specification-Title": "examplemod",
                "Specification-Vendor": "examplemodsareus",
                "Specification-Version": "1", // We are version 1 of ourselves
                "Implementation-Title": project.name,
                "Implementation-Version": "${version}",
                "Implementation-Vendor" :"examplemodsareus",
                "Implementation-Timestamp": new Date().format("yyyy-MM-dd'T'HH:mm:ssZ")
        ])
    }
}


jar.finalizedBy('reobfJar')

publishing {
    publications {
        mavenJava(MavenPublication) {
            artifact jar
        }
    }
    repositories {
        maven {
            url "file:///${project.projectDir}/mcmodsrepo"
        }
    }
}

shadowJar {
    configurations = [project.configurations.shadow]
}
reobf {
    shadowJar {}
}

And if I open the final .jar using WinRar I can see "com/mongodb/...", "com/tatuck/...", "META-INF/...", "org/bson/..." and "pack.mcmeta"
What is the problem? Thanks

 

UPDATE:

I don't mind using Shadow. I just want to know how can I import an external library in the same .jar.

Edited April 11, 2021 by Tatuck
Adding info

[Tatuck]

Update ^