I'm having some difficulties getting mixin to work. I feel like I'm following the correct steps and doing the same as other mods. Probably just being stupid and missing something.

After running the command "gradlew genEclipseRuns" I get the following output:
 

FAILURE: Build failed with an exception.

* Where:
1.19.x/build.gradle' line: 5

* What went wrong:
Plugin [id: 'org.spongepowered.mixin', version: '0.7.+'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'org.spongepowered.mixin:org.spongepowered.mixin.gradle.plugin:0.7.+')
  Searched in the following repositories:
    Gradle Central Plugin Repository
    maven(https://maven.minecraftforge.net/)

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 7s

This is my build.gradle:

plugins {
    id 'eclipse'
    id 'maven-publish'
    id 'net.minecraftforge.gradle' version '5.1.+'
    id "org.spongepowered.mixin" version "0.7.+"
}

version = "1.19.2-$modVersion"
group = 'com.brassamber.modid'
archivesBaseName = 'modid'

java.toolchain.languageVersion = JavaLanguageVersion.of(17)

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: '1.19.2'

    // accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg') // Currently, this location cannot be changed from the default.

    runs {
        client {
            workingDirectory project.file('run/client')
            arg "-mixin.config=modid.mixins.json"

            property 'forge.logging.markers', 'REGISTRIES'
            property 'forge.logging.console.level', 'debug'
            property 'forge.enabledGameTestNamespaces', 'modid'

            mods {
                modid {
                    source sourceSets.main
                }
            }
        }

        server {
            workingDirectory project.file('run/server')
            arg "-mixin.config=modid.mixins.json"

            property 'forge.logging.markers', 'REGISTRIES'
            property 'forge.logging.console.level', 'debug'
            property 'forge.enabledGameTestNamespaces', 'modid'

            mods {
                modid {
                    source sourceSets.main
                }
            }
        }

        gameTestServer {
            workingDirectory project.file('run/gameTestServer')
            property 'forge.logging.markers', 'REGISTRIES'
            property 'forge.logging.console.level', 'debug'
            property 'forge.enabledGameTestNamespaces', 'modid'

            mods {
                modid {
                    source sourceSets.main
                }
            }
        }

        data {
            workingDirectory project.file('run/data')
            property 'forge.logging.markers', 'REGISTRIES'
            property 'forge.logging.console.level', 'debug'

            // Specify the modid for data generation, where to output the resulting resource, and where to look for existing resources.
            args '--mod', 'modid', '--all', '--output', file('src/generated/resources/'), '--existing', file('src/main/resources/')

            mods {
                modid {
                    source sourceSets.main
                }
            }
        }
    }
}

sourceSets.main.resources { srcDir 'src/generated/resources' }

repositories {
    // Geckolib installation
    maven { url 'https://dl.cloudsmith.io/public/geckolib3/geckolib/maven/' }
}

mixin {
    add sourceSets.main, "modid.refmap.json"
}

dependencies {
    minecraft 'net.minecraftforge:forge:1.19.2-43.0.8'
    // Geckolib installation
    implementation fg.deobf('software.bernie.geckolib:geckolib-forge-1.19:3.1.16')

    // Apply Mixin AP
    annotationProcessor 'org.spongepowered:mixin:0.8.5-SNAPSHOT:processor'
}

jar {
    manifest {
        attributes([
                "Specification-Title"     : "modid",
                "Specification-Vendor"    : "BrassAmber",
                "Specification-Version"   : "$modVersion",
                "Implementation-Title"    : "modid",
                "Implementation-Version"  : "$modVersion",
                "Implementation-Vendor"   : "BrassAmber",
                "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"
        }
    }
}

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

This is my modid.mixins.json: (Located in the resources folder)

{
  "required": true,
  "minVersion": "0.8.5",
  "package": "com.brassamber.modid.mixin",
  "refmap": "modid.refmap.json",
  "compatibilityLevel": "JAVA_17",
  "mixins": [
  ],
  "client": [
  ]
}

 

Edited August 28, 20223 yr by Xrated_junior
Typo

This is like walking into a shoe repair shop and asking if they can fix your glasses. 🙂

These are the forge support forums, not mixin.

 

Anyway, you appear to be missing the sponge/mixin maven from your repository configuration:

- Plugin Repositories (could not resolve plugin artifact 'org.spongepowered.mixin:org.spongepowered.mixin.gradle.plugin:0.7.+')
  Searched in the following repositories:
    Gradle Central Plugin Repository
    maven(https://maven.minecraftforge.net/)

e.g. https://github.com/VazkiiMods/Botania/blob/eae067be2c5df0cf89c4e978c3fa2c693580a120/Forge/build.gradle#L5

To correct @warjort Mixin is offically not supported on this Forums.

If you had issues with Mixin ask on the Forge Discord Server in the #non-api-modding Channel.

That's what I said.

I answered it because the problem is really a gradle (repository config) issue rather anything mixin specific.

Thanks for the quick replies! Sorry for asking this in the wrong place though.
Luckily I did finally get it to work today!