Im porting mod from 1.7.10 to 1.12.2

I made the following build.gradle:

plugins {
    id 'net.minecraftforge.gradle' version '5.1.+'
}

apply plugin: 'java-library'

group = 'net.fuix'
version = '1.0-SNAPSHOT'

java {
    archivesBaseName = 'UnifiedLibraryParts'
    toolchain.languageVersion = JavaLanguageVersion.of(8)
}

minecraft {
    // The mappings can be changed at any time and must be in the following format.
    // Channel:   Version:
    // official   MCVersion             Official field/method names from Mojang mapping files
    // parchment  YYYY.MM.DD-MCVersion  Open community-sourced parameter names and javadocs layered on top of official
    //
    // You must be aware of the Mojang license when using the 'official' or 'parchment' mappings.
    // See more information here: https://github.com/MinecraftForge/MCPConfig/blob/master/Mojang.md
    //
    // Parchment is an unofficial project maintained by ParchmentMC, separate from MinecraftForge
    // Additional setup is needed to use their mappings: https://github.com/ParchmentMC/Parchment/wiki/Getting-Started
    //
    // Use non-default mappings at your own risk. They may not always work.
    // Simply re-run your setup task after changing the mappings to update your workspace.
    mappings channel: 'stable', version: '39-1.12'

    // accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')

    // Default run configurations.
    // These can be tweaked, removed, or duplicated as needed.
    runs {
        client {
            workingDirectory project.file('run')

            // Recommended logging data for a userdev environment
            // The markers can be added/remove as needed separated by commas.
            // "SCAN": For mods scan.
            // "REGISTRIES": For firing of registry events.
            // "REGISTRYDUMP": For getting the contents of all registries.
            property 'forge.logging.markers', 'REGISTRIES'


            // Recommended logging level for the console
            // You can set various levels here.
            // Please read: https://stackoverflow.com/questions/2031163/when-to-use-the-different-log-levels
            property 'forge.logging.console.level', 'debug'

           
            mods {
                unifiedlibraryparts {
                    source sourceSets.main
                }
            }
        }

        server {
            workingDirectory project.file('run')

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

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

           
            mods {
                unifiedlibraryparts {
                    source sourceSets.main
                }
            }
        }
    }
}

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

repositories {
    maven {
        url = 'https://hub.spigotmc.org/nexus/content/repositories/snapshots/'
        content {
            includeGroup 'org.bukkit'
            includeGroup 'org.spigotmc'
        }
    }
   
    maven { url = 'https://oss.sonatype.org/content/repositories/snapshots' }
    maven { url = 'https://oss.sonatype.org/content/repositories/central' }
}

configurations.implementation.setCanBeResolved(true)

dependencies {
    // Specify the version of Minecraft to use. If this is any group other than 'net.minecraft' it is assumed
    // that the dep is a ForgeGradle 'patcher' dependency, and its patches will be applied.
    // The userdev artifact is a special name and will get all sorts of transformations applied to it.
    minecraft 'net.minecraftforge:forge:1.12.2-14.23.5.2860'

    implementation 'mysql:mysql-connector-java:5.1.47'
    implementation 'com.zaxxer:HikariCP:4.0.3'
    implementation 'org.json:json:20220924'
   
    compileOnly 'org.spigotmc:spigot-api:1.19.3-R0.1-SNAPSHOT' // The Spigot API with no shadowing. Requires the OSS repo// .
   
    compileOnly 'org.projectlombok:lombok:1.18.24'
    annotationProcessor 'org.projectlombok:lombok:1.18.24'
    testCompileOnly 'org.projectlombok:lombok:1.18.24'
    testAnnotationProcessor 'org.projectlombok:lombok:1.18.24'

    // Real mod deobf dependency examples - these get remapped to your current mappings
    // compileOnly fg.deobf("mezz.jei:jei-${mc_version}:${jei_version}:api") // Adds JEI API as a compile dependency
    // runtimeOnly fg.deobf("mezz.jei:jei-${mc_version}:${jei_version}") // Adds the full JEI mod as a runtime dependency
    // implementation fg.deobf("com.tterrag.registrate:Registrate:MC${mc_version}-${registrate_version}") // Adds registrate as a dependency

    // Examples using mod jars from ./libs
    // implementation fg.deobf("blank:coolmod-${mc_version}:${coolmod_version}")

    // For more info...
    // http://www.gradle.org/docs/current/userguide/artifact_dependencies_tutorial.html
    // http://www.gradle.org/docs/current/userguide/dependency_management.html
   
}

// Example for how to get properties into the manifest for reading at runtime.
jar {
    manifest {
        attributes([
                'Main-Class': 'net.fuix.library.MainDummy',
                "Specification-Title": "unifiedlibraryparts",
                //"Specification-Vendor": "unifiedlibraryparts authors",
                "Specification-Version": "1", // We are version 1 of ourselves
                "Implementation-Title": project.name,
                "Implementation-Version": project.jar.archiveVersion,
                //"Implementation-Vendor": "unifiedlibraryparts authors",
                "Implementation-Timestamp": new Date().format("yyyy-MM-dd'T'HH:mm:ssZ")
        ])
    }

    from {
        duplicatesStrategy = DuplicatesStrategy.INCLUDE
        configurations.implementation.collect { it.isDirectory() ? it : zipTree(it) }
    }
   
    destinationDirectory.set(file("$buildDir/target"))
}

jar.finalizedBy('reobfJar')

tasks.withType(JavaCompile).configureEach {
    options.encoding = 'UTF-8' // Use the UTF-8 charset for Java compilation
}

After building it, I get a jar weighing 90 mb. By analyzing the contents, it turns out that Gradle put a forge with minecraft in it. Spigot and lombok, that also are dependencies, are not there.

How can I fix this?

The version you are using is no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.

Currently supported versions are 1.19.3 (Latest), 1.19.2, and 1.18.2 (LTS).