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java.lang.NoSuchFieldError, with any static field in init.Biomes with shadowJar


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Hello Minecraft Forge Forums,


I kind of have a little bit of an issue with trying to run my mod.


I created a Gradle-based mod and I am using an external dependency. I wanted to embed the dependency into my mod's jar file. I used the Shadow plugin for Gradle, it compiles fine, but when I try to run the mod, I get java.lang.NoSuchFieldError when trying to use any static field in net.minecraft.init.Biomes. 


Here is my build.gradle file:

buildscript {
    repositories {
        maven { url = "https://files.minecraftforge.net/maven" }
    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:2.3-SNAPSHOT'
		classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.3'
apply plugin: 'net.minecraftforge.gradle.forge'
//Only edit below this line, the above code adds and enables the necessary things for Forge to be setup.
apply plugin: 'com.github.johnrengelman.shadow'

version = "0.1"
group = "io.github.mymod" // http://maven.apache.org/guides/mini/guide-naming-conventions.html
archivesBaseName = "mymod"

shadowJar {
	classifier = null

	relocate "org.apache.commons.imaging", "killme.org.apache.commons.imaging"

	dependencies {

sourceCompatibility = targetCompatibility = '1.8' // Need this here so eclipse task generates correctly.
compileJava {
	println "icij"
    sourceCompatibility = targetCompatibility = '1.8'

minecraft {
	println "icimc"
    version = "1.12.2-"
    runDir = "run"
    // the mappings can be changed at any time, and must be in the following format.
    // snapshot_YYYYMMDD   snapshot are built nightly.
    // stable_#            stables are built at the discretion of the MCP team.
    // 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 = "snapshot_20171003"
    // makeObfSourceJar = false // an Srg named sources jar is made by default. uncomment this to disable.

dependencies {
	println "icidp"
    // you may put jars on which you depend on in ./libs
    // or you may define them like so..
    //compile "some.group:artifact:version:classifier"
    //compile "some.group:artifact:version"
    // real examples
    //compile 'com.mod-buildcraft:buildcraft:6.0.8:dev'  // adds buildcraft to the dev env
    //compile 'com.googlecode.efficient-java-matrix-library:ejml:0.24' // adds ejml to the dev env

    // the 'provided' configuration is for optional dependencies that exist at compile-time but might not at runtime.
    //provided 'com.mod-buildcraft:buildcraft:6.0.8:dev'

    // the deobf configurations:  'deobfCompile' and 'deobfProvided' are the same as the normal compile and provided,
    // except that these dependencies get remapped to your current MCP mappings
    //deobfCompile 'com.mod-buildcraft:buildcraft:6.0.8:dev'
    //deobfProvided 'com.mod-buildcraft:buildcraft:6.0.8:dev'
	provided files("lib/CubicChunks-1.12.2-0.0.970.0-SNAPSHOT-all.jar")
	provided files("lib/CubicWorldGen-1.12.2-")
	compile files("lib/commons-imaging-1.0-alpha1.jar")

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


processResources {
	println "icipr"
    // this will ensure that this task is redone when the versions change.
    inputs.property "version", project.version
    inputs.property "mcversion", project.minecraft.version

    // replace stuff in mcmod.info, nothing else
    from(sourceSets.main.resources.srcDirs) {
        include 'mcmod.info'
        // replace version and mcversion
        expand 'version':project.version, 'mcversion':project.minecraft.version
    // copy everything else except the mcmod.info
    from(sourceSets.main.resources.srcDirs) {
        exclude 'mcmod.info'


It seems to be caused by the "classifier = null" line, assigning classifier to anything causes the above error, however, if I remove that line, the dependency does not appear in my jar file. 


(The dependency is Apache's Commons-imaging [org.apache.commons.imaging])


All help and answers are appreciated, if you need any more information, let me know.


Edited by shejan0
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