Gradle build failed

Questions & Answers
1

CommandInvokationFailure: Gradle build failed.
C:/Program Files/Java/jdk-9.0.1\bin\java.exe -classpath “C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.0.1.jar” org.gradle.launcher.GradleMain “-Dorg.gradle.jvmargs=-Xmx2048m” “assembleRelease”

stderr[

FAILURE: Build failed with an exception.

  • What went wrong:
    Could not determine java version from ‘9.0.1’.

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
    ]
    stdout[

]
exit code: 1
UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action1 progress, System.String error) UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, System.Action1 progress)
Rethrow as GradleInvokationException: Gradle build failed
UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, System.Action`1 progress)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

3

There’s currently an incompatibility between Unity and JDK 9.0.1.

Downgrade to JDK 8.

2

There’s currently an incompatibility between Unity and JDK 9.0.1.

Downgrade to JDK 8.

4

Try to use gradle 2.3.0 instead of 2.1.0 or 4.0.1
You need to edit file mainTemplate.gradle in project folder \Assets\Plugins\Android\

     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.0'
     }

https://forum.unity.com/threads/gradle-build-error-gradle-version-2-10-is-required-current-version-is-4-0-1.499520/