CreateProcess error=206 when building

Hello everyone , I am trying to use dl4j in my java project .

Unfortunatly when i try to add it to my gradle as shown in this link

My Build won’t work with this error:

A problem occurred starting process 'command 'C:\Program Files\Java\jdk-17\bin\java.exe''
> Could not start 'C:\Program Files\Java\jdk-17\bin\java.exe'
  > Cannot run program "C:\Program Files\Java\jdk-17\bin\java.exe" (in directory "E:\minecraft_mod\build\reobfJar"): CreateProcess error=206,The filename or extension is too long
    > CreateProcess error=206, The filename or extension is too long

I litteraly just spent 4 hours searching for solutions but none of them would work.

The command size limitation made by windows is creating this error , there is a workaround in intelliJ , name “Shorten command lines” but it is only for application lauching.

I found this solution for gradle but it also doesn’t work.

Most of the solution that i found were used for spring application using gradle so i am afraid it need more configuration for forge or it just won’t work.

Here is my build.gradle

import org.gradle.nativeplatform.platform.internal.DefaultNativePlatform

plugins {
    id 'eclipse'
    id 'idea'
    id 'maven-publish'
    id 'net.minecraftforge.gradle' version '[6.0,6.2)'
    id 'org.parchmentmc.librarian.forgegradle' version '1.+'
    id "com.github.ManifestClasspath" version "0.1.0-RELEASE"
version = mod_version
group = mod_group_id

base {
    archivesName = mod_id

// Mojang ships Java 17 to end users in 1.18+, so your mod should target Java 17.
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 {
    // 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:
    // Parchment is an unofficial project maintained by ParchmentMC, separate from MinecraftForge
    // Additional setup is needed to use their mappings:
    // 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: 'parchment', version: '2023.09.03-1.20.1'

    // When true, this property will have all Eclipse/IntelliJ IDEA run configurations run the "prepareX" task for the given run configuration before launching the game.
    // In most cases, it is not necessary to enable.
    // enableEclipsePrepareRuns = true
    // enableIdeaPrepareRuns = true

    // This property allows configuring Gradle's ProcessResources task(s) to run on IDE output locations before launching the game.
    // It is REQUIRED to be set to true for this template to function.
    // See
    copyIdeResources = true

    // When true, this property will add the folder name of all declared run configurations to generated IDE run configurations.
    // The folder name can be set on a run configuration using the "folderName" property.
    // By default, the folder name of a run configuration is the name of the Gradle project containing it.
    // generateRunFolders = true

    // This property enables access transformers for use in development.
    // They will be applied to the Minecraft artifact.
    // The access transformer file can be anywhere in the project.
    // However, it must be at "META-INF/accesstransformer.cfg" in the final mod jar to be loaded by Forge.
    // This default location is a best practice to automatically put the file in the right place in the final jar.
    // See for more information.
    // accessTransformer = file('src/main/resources/META-INF/accesstransformer.cfg')

    // Default run configurations.
    // These can be tweaked, removed, or duplicated as needed.
    runs {
        // applies to all the run configs below
        configureEach {
            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:
            property 'forge.logging.console.level', 'debug'

            mods {
                "${mod_id}" {
                    source sourceSets.main

        client {
            // Comma-separated list of namespaces to load gametests from. Empty = all namespaces.
            property 'forge.enabledGameTestNamespaces', mod_id

        server {
            property 'forge.enabledGameTestNamespaces', mod_id
            args '--nogui'

        // This run config launches GameTestServer and runs all registered gametests, then exits.
        // By default, the server will crash when no gametests are provided.
        // The gametest system is also enabled by default for other run configs under the /test command.
        gameTestServer {
            property 'forge.enabledGameTestNamespaces', mod_id

        data {
            // example of overriding the workingDirectory set in configureEach above
            workingDirectory project.file('run-data')

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

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

repositories {
    // Put repositories for dependencies here
    // ForgeGradle automatically adds the Forge maven and Maven Central for you

    // If you have mod jar dependencies in ./libs, you can declare them as a repository like so.
    // See
    // flatDir {
    //     dir 'libs'
    // }

dependencies {
    // Specify the version of Minecraft to use.
    // Any artifact can be supplied so long as it has a "userdev" classifier artifact and is a compatible patcher artifact.
    // The "userdev" classifier will be requested and setup by ForgeGradle.
    // If the group id is "net.minecraft" and the artifact id is one of ["client", "server", "joined"],
    // then special handling is done to allow a setup of a vanilla dependency without the use of an external repository.
    minecraft "net.minecraftforge:forge:${minecraft_version}-${forge_version}"
    implementation "org.deeplearning4j:deeplearning4j-core:1.0.0-beta6"

    // Example mod dependency with JEI - using fg.deobf() ensures the dependency is remapped to your development mappings
    // The JEI API is declared for compile time use, while the full JEI artifact is used at runtime
    // compileOnly fg.deobf("mezz.jei:jei-${mc_version}-common-api:${jei_version}")
    // compileOnly fg.deobf("mezz.jei:jei-${mc_version}-forge-api:${jei_version}")
    // runtimeOnly fg.deobf("mezz.jei:jei-${mc_version}-forge:${jei_version}")

    // Example mod dependency using a mod jar from ./libs with a flat dir repository
    // This maps to ./libs/coolmod-${mc_version}-${coolmod_version}.jar
    // The group id is ignored when searching -- in this case, it is "blank"
    // implementation fg.deobf("blank:coolmod-${mc_version}:${coolmod_version}")

    // For more info:

// This block of code expands all declared replace properties in the specified resource targets.
// A missing property will result in an error. Properties are expanded using ${} Groovy notation.
// When "copyIdeResources" is enabled, this will also run before the game launches in IDE environments.
// See
tasks.named('processResources', ProcessResources).configure {
    var replaceProperties = [
            minecraft_version: minecraft_version, minecraft_version_range: minecraft_version_range,
            forge_version: forge_version, forge_version_range: forge_version_range,
            loader_version_range: loader_version_range,
            mod_id: mod_id, mod_name: mod_name, mod_license: mod_license, mod_version: mod_version,
            mod_authors: mod_authors, mod_description: mod_description,
    ] replaceProperties

    filesMatching(['META-INF/mods.toml', 'pack.mcmeta']) {
        expand replaceProperties + [project: project]

// Example for how to get properties into the manifest for reading at runtime.
tasks.named('jar', Jar).configure {
    manifest {
                'Specification-Title'     : mod_id,
                'Specification-Vendor'    : mod_authors,
                'Specification-Version'   : '1', // We are version 1 of ourselves
                'Implementation-Title'    :,
                'Implementation-Version'  : project.jar.archiveVersion,
                'Implementation-Vendor'   : mod_authors,
                'Implementation-Timestamp': new Date().format("yyyy-MM-dd'T'HH:mm:ssZ")

    // This is the preferred method to reobfuscate your jar file
    finalizedBy 'reobfJar'

// However if you are in a multi-project build, dev time needs unobfed jar files, so you can delay the obfuscation until publishing by doing:
// tasks.named('publish').configure {
//     dependsOn 'reobfJar'
// }

// Example configuration to allow publishing using the maven-publish plugin
publishing {
    publications {
        register('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

What is the full --stacktrace? Can you share a build --scan?

here he is the scan build: Build Scan® | Develocity

@Vampire Did you watch it a didn’t see anything releveant ?

I cannot look in detail as I don’t have a computer around the next two weeks. But it seems to be when trying to execute the reobfJar task. So maybe you can do something specific to that task to mitigate the problem. Besides that, it might make sense to ask the MinecraftForge maintainers, I think the task should be coming from them.