How can I fix "unsupported class file major version 60" in IntelliJ IDEA?

Question

I have a Gradle project in Ubuntu. It's written in Java 14. I have the Java 14 JDK installed. When I build it from the command line, everything works, but no one wants to use a command line! When I open it in IntelliJ IDEA, it throws an error:

* Where:
Initialization script '/tmp/ijmapper.gradle`

* What went wrong:
Could not compile initialization script '/tmp/ijmapper.gradle`.
> Startup failed:
General error during semantic analysis: Unsupported class file major version 60.

followed by a long, unhelpful stack trace that says a lot about Groovy. (The project is not a Groovy project; it's a Java project.)

Major version 60 refers to Java 16, which this project is not using. I've already gone into Project Structure and made sure that it's set to use JDK version 14. But the name "ijmapper" suggests that this has something to do with IntelliJ specifically, and this is likely an IDE problem rather than a project problem.

The mapper file simply says:

if(!ext.has('mapPath')) ext.mapPath = { path -> path}

A simple polyfill, in other words.

What's going on here and how can I fix it?

How are you running it in Intellij? Doesn't intellij print the exact command at the top of the terminal panel? It usually does. Take that and compare it to what you were running manually — Michael, Apr 13 '21 at 17:06
@CrazyCoder I was today years old when I learned that Gradle has its own JDK setting rather than respecting the one you set for the project. Thanks, I'd have never thought to look that up! — Mason Wheeler, Apr 13 '21 at 17:22
And you will be tomorrow years old, when you learn, that IntelliJ will sometimes just forget about this setting and switches from PROJECT_JDK to something, that is around. — cfrick, Apr 13 '21 at 17:25
check your system java, despite my settings in AS my JAVA_HOME wasnt being set and i had to explicitly set it to the version used in the environment-setup https://stackoverflow.com/questions/21964709/how-to-set-or-change-the-default-java-jdk-version-on-macos — raddrick, Jul 07 '21 at 06:06
For anyone in the future thinking "This couldn't be my issue, I just created the project and gradle supports my version of java!" just like I thought, think again. [Check your gradle version](https://stackoverflow.com/questions/30054911/how-to-determine-the-version-of-gradle). As of November 2021, the libjdx project creator uses gradle 6.0, and I'm guessing it's not the only framework which does this. — import huh, Nov 28 '21 at 20:27

score 93 · Answer 1 · edited Apr 22 '22 at 12:21

93

TL;DR; You need to have the Java version which is compatible with your Gradle version, and configure Gradle to use exactly that version (not older Java, and not even newer version).

I fixed this problem by changing the Gradle JVM settings in IntelliJ settings:

In the Settings/Preferences dialog, go to Build, Execution, Deployment → Build Tools → Gradle.
Under the Gradle section, change the Gradle JVM option. Select a Gradle JVM which works for you.

See Resolve the Gradle JVM version for the existing project

edited Apr 22 '22 at 12:21

Top-Master

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answered Apr 15 '21 at 03:25

Yu Jinyan

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Mentioning what setting worked for you and hat you had previously would help. – phant0m Apr 30 '21 at 19:39
4

just got the issue on a kotlin tutorial https://github.com/kotlin-hands-on/intro-coroutines . Changing the Gradle JVM to 1.8 solved the issue – vincent May 27 '21 at 18:51
1

I downgraded from JDK 16 to JDK 15 to successfully build my app. – Ben Butterworth Jul 12 '21 at 08:19
2

Didn't work for me - a couple of builds went OK, then it barfed with the same message. Annoying thing is that the project wizard offered to install 16 for me, but it can't use it... – Tullochgorum Jul 17 '21 at 18:55
This approach really saved my day! Yesterday, I switched to OJDK17 and worked very well. Don't know why today it says all errors and I have to set back to JDK15 and all good things back. – Tiny Sonhh Oct 14 '21 at 09:31
I thinks Java has lots of changes after 1.8.x (Java 8). – Johnny Jan 18 '22 at 02:38

score 53 · Answer 2 · edited Jan 03 '22 at 23:46

53

For me, it was fixed by upgrading the Gradle version.

In the file under the directory gradle/wrapper/gradle-wrapper.properties, just change the version number of Gradle. For example, if your Gradle version is 6.3, change this:

distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip

to:

distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-bin.zip

It is not available in File → Project Structure → Project for the project I was working with.

edited Jan 03 '22 at 23:46

Peter Mortensen

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answered Jun 13 '21 at 07:18

John Lehmann

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You saved my day – Idan Aug 24 '21 at 14:56
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Gradle (version> 7.3.2) now supports running on and building with Java 17. – MohamedHarmoush Dec 19 '21 at 10:58
thank you for this answer! very helpful. – Rohinibabu Dec 21 '21 at 19:32
You saved my day ! – yousoumar Jan 26 '22 at 07:10

score 17 · Answer 3 · edited Jan 03 '22 at 23:21

17

Upgrading Gradle version 6.8.3 to 7.0 solved my problem. You can upgrade it:

Menu File → Project Structure → Project (on the left panel)
Change to Gradle version 7.0

It works with the Android Gradle plugin version 4.2.0.

edited Jan 03 '22 at 23:21

Peter Mortensen

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answered May 10 '21 at 07:01

Emirhan Soylu

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Thanks. It works after updating Gradle Version to 7.0.2 and Android Gradle Plugin version from 4.1.0 to 7.0.1. In file android/build.grandle classpath changed to 'com.android.tools.build:gradle:7.0.1'. On my machine java 16.0.1, Flutter 2.2.3, Dart 2.13.4 – wondertalik Aug 24 '21 at 09:51
1

Gradle (version> 7.3.2) now supports running on and building with Java 17. – MohamedHarmoush Dec 19 '21 at 10:59

score 8 · Answer 4 · edited Jan 03 '22 at 23:29

I fixed it too, the hard way:

Java

Installed the latest Java JDK
Fixed the Java path in the system environment variables by adding the JAVA_HOME variable (main Java folder without bin) and added %JAVA_HOME%\bin to the PATH environment variable
java -version shows the correct version now

Gradle

Installed Gradle from scratch using https://gradle.org/install/
Fixed the Gradle path in the system environment variables by adding the GRADLE_HOME variable (main Gradle folder without bin) and added %GRADLE_HOME%\bin to the PATH environment variable
gradle -version shows the correct version now incl. the correct JVM

IntelliJ IDEA settings

Go to Settings → Build, Execution, Deployment → Build Tools → Gradle
Edit Gradle user home (C:/Gradle/gradle-7.0.2)
Use Gradle from: C:/Gradle/gradle-7.0.2
Gradle JVM: JAVA_HOME version 16.0.1

Now it builds without error: Unsupported class file major version 60

This worked for me but i skipped GRADLE step – Amit Goswami Aug 20 '21 at 10:07 — Amit Goswami, Aug 20 '21 at 10:07

MendelG · Answer 5 · 2021-06-28T19:02:32.030

For me, (in Flutter) the problem was that I was using Java JDK version 16, but version 16 is not supported for some packages.

So, I downgraded to JDK version 15.

On Windows, I did the following:

Close your current IDE / Terminal (do not skip this step).
Uninstall the current Java JDK and restart your computer.
Download and install Java JDK version 15 from here (you are required to create an account in order to download).
Update the JAVA_HOME Environment Variable.

score 7 · Answer 6 · edited Jan 03 '22 at 23:45

In my case (Manjaro Linux), the issue was that there is a known bug with OpenJDK 16 and Gradle. (See: * "Unsupported class file major version 60" Using toolchain with Java 16 #16766*)

The solution was to point Java to openJdk-11 with the following command:

sudo archlinux-java set java-11-openjdk

Make sure that this JDK is installed. On Arch Linux and Manjaro you can check it with:

archlinux-java status

After switching to OpenJDK 11 everything works again like expected.

score 6 · Answer 7 · edited Jan 03 '22 at 23:54

I faced the same issue, but with Android Studio. It seems like JDK 17 is not compatible with Gradle 7.0.2 as the others mentioned that.

I fixed this problem by changing the Gradle JDK settings in Android Studio settings:

In menu File → Settings → Build, Execution, Deployment → Build Tools → Gradle.

In the Gradle section, change the Gradle JVM option to another JDK (example: JDK11).

Later Gradle versions (version higher than 7.3.2) support running on and building with Java 17.

score 4 · Answer 8 · edited Jan 03 '22 at 23:48

4

I ran into the same issue. It seems like JDK 17 is not compatible with Gradle 7.0.2.

Download JDK 16, drop it _somewhere_ (close to other JDK's folders or whatever)

Next, update: Project Structure → SDK Location → Gradle Settings → Gradle JDK to match that _somewhere_

At the end, don't forget to Sync Project with Gradle files.

edited Jan 03 '22 at 23:48

Peter Mortensen

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answered Sep 25 '21 at 15:50

Al Po

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score 1 · Answer 9 · edited Jan 03 '22 at 23:51

1

At the moment, it won't work with JDK 17, so it is suggested to use embedded Java provided from IDE in Settings/Gradle.

edited Jan 03 '22 at 23:51

Peter Mortensen

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answered Oct 04 '21 at 12:23

zakiblacki

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score 1 · Answer 10 · answered Jan 28 '22 at 18:19

Changing, as people mentioned above, the url with the correct compatibility: https://docs.gradle.org/current/userguide/compatibility.html In my case 7.3 because I was using JDK 17 and Java 8 worked for me!

distributionUrl=https\://services.gradle.org/distributions/gradle-7.3-bin.zip ```

score 0 · Answer 11 · edited Jan 03 '22 at 23:33

My project is using Java 16 and Maven to build a Spring Boot application. I got the same error and was able to resolve it with these steps:

Navigate to IntelliJ IDEA → Preferences... → Build, Execution, Deployment → Compiler → *Java Compiler
Select your module under "Per-module bytecode version:"
Click the red "-" button to delete the custom setting
Click Apply

I think this bytecode setting (16) was conflicting with the one configured in my project (11). Removing the override cleared it up.

score 0 · Answer 12 · edited Jan 04 '22 at 00:01

0

In Spring Tool Suite (STS)/Eclipse even after changing the build path, compiler, default JRE from 16 to 11.0 it did not fix. Finally in the STS.ini file, I had to change the -vm argument from

-vm plugins/org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_16.0.2.v20210721-1149/jre/bin

to

-vm C:\Program Files\Java\jdk-11.0.12\bin

edited Jan 04 '22 at 00:01

Peter Mortensen

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answered Oct 24 '21 at 03:20

Prashant S

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score 0 · Answer 13 · edited Jan 16 '22 at 00:50

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I fixed it by installing chocolatey package manager (https://chocolatey.org/install) and running:

choco install -y nodejs.install openjdk8

in powershell admin.

edited Jan 16 '22 at 00:50

Giancarlo Romeo

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answered Jan 14 '22 at 22:31

Joel V98

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How can I fix "unsupported class file major version 60" in IntelliJ IDEA?

13 Answers13

Java

Gradle

IntelliJ IDEA settings

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