Unsupported class file major version 61 error

Question

I am trying to run a flutter app, and this error appeared while trying to, what I did was that I wanted to run flutter apps without android studio, so I download android SDK and JDK 17, after I ran flutter doctor and it gave me that everything is good, I tried to run and it gave me this error:

FAILURE: Build failed with an exception.

* Where:
Build file 'E:\Flutter Apps\first_app\android\build.gradle'

* What went wrong:
Could not compile build file 'E:\Flutter Apps\first_app\android\build.gradle'.
> startup failed:
  General error during semantic analysis: Unsupported class file major version 61
.............

So I tried an older version of JDK, it gave me another error, so I saw a third solution to run with JDK 17, which is to downgrade the gradle in gradle.properties, but it just gave me a fourth error, so does anyone know a final solution for this error ??

Your java and/or javac at level 1.17 are not activated. Somehow it's picking up an earlier version. Check PATH. You can do this at a command line with `javac -version` — g00se, Oct 03 '21 at 14:55
I really think that it has something between the compatability of JDK version and gradle — DeveloperOmar100, Oct 03 '21 at 14:58
I think that this is the problem [compatability](https://docs.gradle.org/current/userguide/compatibility.html) — DeveloperOmar100, Oct 03 '21 at 15:10
a. make sure that version is the one being used by your IDE. Also the same with `java` — g00se, Oct 03 '21 at 15:16
so I downloaded JDK 16 and updated gradle to 7.0 -according to the compatablity table, so it ran at first but then gave me this error — DeveloperOmar100, Oct 03 '21 at 15:50
Execution failed for task ':app:processDebugMainManifest'. > Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not "opens java.io" to unnamed module @ac71d33 — DeveloperOmar100, Oct 03 '21 at 15:50
@DeveloperOmar100 I am facing the same problem did you find the solution? — Mahi, Oct 21 '21 at 16:40

score 27 · Answer 1 · edited Jan 25 '22 at 17:58

27

Based on the answer of DeveloperOmar 100 I found the following solution:

switch your Java version to a compatible version, in my case to Java version 16.0.2

To switch it you have to set your PATH. (e.g for Mac, you can use the java_home command).
check your Gradle version and update that one too, so it is compatible (see the Gradle wrapper docs) so in my case I had to change the distributionUrl property in android/gradle/wrapper/gradle-wrapper.properties:
```
distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip
```

edited Jan 25 '22 at 17:58

David Moles

48,006
27
136
235

answered Nov 08 '21 at 10:06

paddy-p

271
2
4

Using the gradle distribution distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip worked for me with Java 16.0.2 as of Dec 2021 – Vilmir Dec 12 '21 at 14:09
5

Note that as of version 7.3, Gradle supports Java 17, so setting the `distributionUrl` version to the latest 7.3.x (e.g. 7.3.3 at this writing) should take care of the problem. – David Moles Jan 25 '22 at 18:00
I found that I had to switch back to a compatible version of Java before I could follow the Gradle upgrade procedure at https://docs.gradle.org/7.4/userguide/upgrading_version_6.html. Also, my GRADLE_HOME environment variable may have been part of my problem. – cowang Mar 04 '22 at 13:27
Same error, I'm on MacOs, and JDK is: openjdk 17.0.2 2022-01-18 – thecr0w Oct 11 '22 at 03:21

score 6 · Answer 2 · answered Feb 03 '23 at 05:14

6

For me, upgrading Gradle fixed the issue. I just had to do change this line in the gradle-wrapper.properties file:

distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip

answered Feb 03 '23 at 05:14

Valentin

5,379
7
36
50

This solution works for me. I have updated my Gradle from 6.7 to 7.4. – Hoa Nguyen Apr 23 '23 at 02:03
Worked for me, thansk! – Khan Sharukh Aug 25 '23 at 17:01

score 2 · Answer 3 · answered Apr 24 '23 at 03:29

2

SOLUTION

1, Edit gradle path: 6.7 => 7.3

2, Update classpath: 4.1.0 => 7.0.0

answered Apr 24 '23 at 03:29

hgiahuyy

180
1
5

score 1 · Answer 4 · answered Feb 26 '22 at 12:43

I ran into the same problem when I tried out Kotlin/Compose on my windows computer. I followed the instructions at https://github.com/JetBrains/compose-jb/tree/master/tutorials/Getting_Started

I struggled with this for a few hours before I finally was able to solve all the problems I encountered.

Solution

In gradle settings changed Gradle JVM: 11 (version 11.0.12)
In build.gradle.kts I deleted

tasks.withType { kotlinOptions.jvmTarget = "16" }

What caused the problems

I started by installing

latest JDK (version 17)
IntelliJ IDEA 2021.3.2 (Community Edition)

Then I created a 'hello world' example with following settings:

Project template: Compose Desktop Application uses Kotlin 1.5.31
Build system: Gradle Kotlin
Project JDK: 17 Oracle OpenJDK version 17.0.2
Template: Compose Desktop Module
Target JVM version: 16
Test framework: JUnit 5

When the project was created I updated build.gradle.kts

plugins {
  kotlin("jvm") version "1.6.10"
  id("org.jetbrains.compose") version "1.0.1"
}

First error at build

BUG! exception in phase 'semantic analysis' in source unit 'BuildScript' Unsupported class file major version 61

I fixed this by changing gradle settings

Gradle JVM: 11 (version 11.0.12)

Now the build was ok but run would fail

Second error at run

Execution failed for task ':run'. Process 'command 'C:\Program Files\Microsoft\jdk-11.0.12.7-hotspot\bin\java.exe'' finished with non-zero exit value 1

This was solved by deleting

tasks.withType<KotlinCompile> {
  kotlinOptions.jvmTarget = "16"
}

in build.gradle.kts

b-bence · Answer 5 · 2022-11-21T08:31:17.963

I had the same issue and after trying all the jdk based solutions, it turned out that my installed Gradle was outdated - 7.0.2 was installed, which doesn't support JDK 17.

You can check your Gradle version with: gradle -version

Check which Gradle you need for a specific version of Java here: https://docs.gradle.org/current/userguide/compatibility.html

After updating it to the latest version the issue went away: https://gradle.org/install/

score 0 · Answer 6 · answered Mar 28 '23 at 17:48

I have java 17 and tried to execute Junit version 4 and this is where I faced this exact error.

However I have downgraded my java version to 11, re-ran the code and viola, this error is gone.

Alternatively I could have upgraded the Junit version to 5 without disturbing the java version 17, choice is yours as per your requirements.

Anuar · Answer 7 · 2021-10-30T06:40:31.487

-8

Simply remove java 17 from the system. Thats helped me

edited Oct 30 '21 at 06:40

answered Oct 28 '21 at 11:36

Anuar

35
2

Based on how this answer is written, it's unclear that removing Java17 is the root cause of the problem or simply just a good idea. – Lance Kind Oct 28 '21 at 12:35
only removing java17 helped me – Anuar Oct 28 '21 at 17:02
OK. May I suggest that you edit your answer to: Simply remove Java17 from the system. – Lance Kind Oct 28 '21 at 23:35
1

Adding the "helps" makes it sound like an "aid" rather than a solution. But your meaning is that it is a solution. :-) – Lance Kind Oct 28 '21 at 23:35
Ok, tnx, im not a native speaker – Anuar Oct 30 '21 at 06:39
No problem Anuar. Keep contributing! I'm not a native speaker in other languages and I still post on social media there. So keep at it. – Lance Kind Nov 08 '21 at 02:26
remove if you have more than one jdk version on your device – Michael Yang Apr 14 '22 at 11:04

Unsupported class file major version 61 error

7 Answers7

Solution

What caused the problems

First error at build

Second error at run

Linked

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