How to fix "JAVA_HOME environment references a directory" in unity3d

Question

I have a problem showed on this screenshot:

Android Resolver

JAVA_HOME environment references a directory (C:\Program Files\Java\jdk1.8.0_212) that does not contain java which is required to process Android libraries.

The problem has appeared when I imported GoogleMobileAds package to insert AdMob ads to my project. I tried to create 2 local variables "JAVA_HOME" and "PATH" in environment variables using this guide https://null-code.ru/solution/157-reshenie-exception-jar-not-found-windows.html , but it doesn't help me.

Evorlor · Answer 1 · 2022-12-13T16:36:31.410

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It is a Unity bug. To fix:

Edit->Preferences->External Tools
Uncheck Android SDK Tools Installed with Unity (recommended)
Press Browse -> It might update the filepath
Recheck Android SDK Tools Installed with Unity (recommended)

Then:

Assets->Play Services Resolver->Android Resolver->Resolve

This has been tested and works with Unity 2019, Unity 2020, and Unity 2021.

edited Dec 13 '22 at 16:36

answered Aug 05 '19 at 15:00

Evorlor

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Thanks, solved the problem with Unity 2019.2.19 too – PGibouin Jan 31 '20 at 12:07
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.. and 2019.3.0f6 :) – 01F0 Feb 16 '20 at 10:00
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Something like that worked for me on Linux Mint (Ubuntu-based distro). I just had to agree to the suggested JDK version after I unchecked the Installed SDK Tools option, then I checked it again. – Vladius Apr 19 '20 at 12:28
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This generally seems to work, but you may need to do the same process with the JDK path setting instead of the SDK one. – Marconius May 20 '20 at 08:07
muchas gracias senior – bturner1273 Mar 11 '21 at 23:55
In Unity Hub, go to Installs and click the dots to open 'Add Modules' and ensure when expanding the Android Build Support dropdown you have both Android SDK & NDK Tools and OpenJDK selected. – zzzzzz May 10 '21 at 23:13
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I also had to delete "C:\Users\\[USER_NAME]\.gradle" folder. – Alireza Aug 21 '21 at 10:03
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Worked for 2021.1.21f1, thanks! – Yern Oct 02 '21 at 12:12
In 2020.3.16f1 I actually had my Android SDK Tools Installed with Unity (recommended) unchecked by default. Checking it solved my issue. (which is odd because I had built an apk just a few days ago without any issues) – Display name Apr 03 '22 at 02:47
This same bug is popping up againg in Unity 2022, how is this possible? – a.dibacco Sep 26 '22 at 19:20
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worked with unity 2021.3 too – Romain Bitard Dec 13 '22 at 10:35

score 6 · Answer 2 · answered Jun 08 '20 at 05:18

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try Assets-> Play Services Resolver-> Android Resolver-> Delete Resolved Libraries

answered Jun 08 '20 at 05:18

Pranav Mehta

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I had to Delete Resolved Libraries also ! – Indra Kumar S May 31 '21 at 15:49
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Same here. This worked perfectly – De Wet Ellis Dec 17 '21 at 11:03
So far that also seems to have worked for me, too. – WPWPWP Jan 22 '22 at 22:54

score 1 · Answer 3 · answered Jun 23 '19 at 10:13

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check is your Java set true or not: go to cmd and type JAVA -version if this appeared means your JDK is set if not check this link: https://confluence.atlassian.com/doc/setting-the-java_home-variable-in-windows-8895.html

after these, if you have the problem again update your JDK from https://www.oracle.com/technetwork/java/javase/downloads/index.html

answered Jun 23 '19 at 10:13

Ali Amini

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It doesn't help me. Maybe I need download JDK 8 Update 212? If it exists. – JediMan4ik Jun 23 '19 at 11:16

score 0 · Answer 4 · answered Apr 21 '20 at 19:02

i was using admob plugin in my project and this is how i resolved the issue after trying all given solutions.

reimport the admob plugin / plugins you are using in your project. (i just reimport the latest version of admob plugin and issue resolved)

score 0 · Answer 5 · answered Jul 21 '20 at 00:04

For me it was similar to this answer https://stackoverflow.com/a/57361245/2149955 but just a bit different so sharing a separate answer for when you haven't installed the tools through unity hub.

In Unity:

Edit->Preferences->External Tools
See error messages "You are missing the recommended <TOOL>. Install the recommended version using Unity Hub"

In Unity Hub:

Installs -> My Unity Version -> ... -> Add Modules, Twirl open Android Build Support -> Check Android SDK & NDK Tools (I also checked OpenJDK)
Press Next -> Accept Terms
Wait for install to finish

After that finishes, back in Unity:

If you look in external tools again, the error messages will be gone
Assets->Play Services Resolver->Android Resolver->Resolve

score 0 · Answer 6 · answered Sep 14 '20 at 05:53

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Update to Unity 2019.4.10f fixed it

answered Sep 14 '20 at 05:53

Roy

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score 0 · Answer 7 · answered Jun 11 '21 at 02:25

When I wanted to make an app for Android, I got this and many more as errors. Nothing worked, including the solutions here. I tried both Unity versions 2020.3.5f1 and 2019.4.22f1, it didn't work.

I figured out that the problem was due to "Android Built Support" not being fully installed. I did the following and the problem was gone:

Unity Hub (my version 2.4.3) -> from the left menu, go Installs
Click the 3 dots in the upper right corner of the Unity version you want (I used 2019.4.22f1) -> Add Modules
From Platforms, find "Android Built Support"
Its check box was checked because I installed it before, but if you don't have it, first install it
Display its submodules with the arrow to its left; "Android SDK & NDK Tools" and "OpenJDK"
Check their check boxes, next and install
Restart Unity
When you open the project, it resolves
It gave me another warning after the resolve, so I made sure that the problem was gone by doing "Assets->External Dependency Maneger->Android Resolver->Force Resolve" in the project again.

Onat Korucu · Answer 8 · 2021-10-31T20:55:52.940

I faced this error when I wanted to build for Android. The reason I have faced this is that I had 2 Unity versions (2019.4.9f1 and 2020.3.3f1), and my JAVA_HOME was configured to use the java folder inside 2019.4.9f1. I then uninstalled and removed 2019.4.9f1, and after that, I got this error when trying to build in 2020.3.3f1.

I changed my JAVA_HOME variable permanently, following the link below: How to set JAVA_HOME in Mac permanently?
Restarted my Macbook.
Went to Unity -> Preferences -> External tools, unchecked NDK, JDK, etc., clicked the Browse button that appeared, and selected the folder under 2020.3.3f1 manually for JDK.

(In the end, no folder should change when you uncheck and check again)

score 0 · Answer 9 · edited Dec 03 '21 at 23:00

Simple fix. I got this message about Missing the JDK. If you have one that is similar or pointing to the wrong JDK you can try this fix.

Here is the Error I was getting:

I solved this by:

In Unity goto "Edit->Preferences->External Tools"
Unchecked the box "JDK Installed with Unity (recommended)", and noticed that the Path was pointing to an Old version of Unity I had uninstalled.
Changed the Path to the current version of Unity I am usings, OpenJDK directory.
Re-checked the box "JDK Installed with Unity (recommended)"

Then was able to build my game, and build to my android phone just fine. Note: If your having problems with the SDK or NDK you could try this solution, by unchecking, and re-checking their respective boxes.

score 0 · Answer 10 · answered Jan 29 '22 at 09:38

This Worked For me: If u had rectified JAVA_HOME, JDK SDK files & every possible way and solution does not show up try

preference -> in android untick the JDK installed.., if you see a change in directory then just re tick, copy path of JDK and uncheck, finally paste the path close(x) preference TRY BUILD & RUN Next time you open Unity Editor then try to check & uncheck JDK we have to see the same directory both ways

score 0 · Answer 11 · answered Sep 13 '22 at 06:42

there is no sdk if you install unity editor without hub. it seems unity want to use the versions they want. so it's very poor support for previous historty version. there is a workaround. you can install a version offically recommanded. and then copy the sdk, ndk, openjdk folder from the offical version folder to the folder you are using. for windows, these folder is like this: from: C:\Program Files\Unity\Hub\Editor\2021.3.21f1c1\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK to: C:\Program Files\Unity\Hub\Editor[your_version]\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK

score 0 · Answer 12 · answered Jul 26 '23 at 18:59

This error appears when you have any google sdk present in your project.

Fix:

In your unity Preferences (Edit -> Preferences) there is a JDK path, copy it.
Open Environment variables in windows. Look under "System variables" for a variable name "JAVA_HOME" then Click Edit. (If not present Click Create).
write variable name as "JAVA_HOME" and in variable value paste the JDK path you copied. and press OK.
Restart unity.

And it should work Fine!

How to fix "JAVA_HOME environment references a directory" in unity3d

12 Answers12