Android build error: invalid source release: 17

[jacobdedman]

If you are looking for help, please confirm the following...

• I confirm I have searched the Docs, Codemagic Sample Projects, and GitHub Discussions.
• I confirm the software versions on my local computer match the ones in CI environment (e.g. Xcode version, Gradle version). See here
• I confirm I am able to do a fresh clone of the repository and build the project on my local computer.

Which mobile framework are you using?

Flutter (Dart)

Steps to reproduce

1. Build for android
2. error

Expected results

I expect the app to build

Actual results

App build failed for android with error:

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':add_2_calendar:compileReleaseJavaWithJavac'.

error: invalid source release: 17

This only started happening after I tried to do a build to support Android 14. But I get the same error when I try to build my main branch that has successfully built in the past.

gradlew and graddle-wrapper files are in the repo I am building from

Build id (optional)

65380254d594314bb3fb964c

[dominikIncibit]

same problem here! Is there any solution available?

[Ttkrommendijk]

same here. I use flutterflow and deploy to app store which is all fine, but when deploying directly to playstore I get the same message.

[jacobdedman]

@fleckdalm @Ttkrommendijk I think I found the solution:
For Android 14 you'll need these versions (or more recent ones)

Flutter: 3.7.12
Gradle: 8
Android Gradle Plugin: 7.3.0 - this is in android/build.gradle in the buildscript/dependencies block - "classpath 'com.android.tools.build:gradle:7.3.0'"
Kotlin Gradle Plugin: 1.6.10 - this is also in android/build.gradle - ext.kotlin_version = '1.6.10' - and the classpath - "classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version""

I am still having local build issues with other dependencies from pubspec.yaml needing upgrades but I think the above is the general fix for this

[jacobdedman]

This was an issue with the add_2_calendar package

A recent update (2.2.5) the the add_2_calendar package added support for iOS 17 and I'm assuming the error log was in reference to that. Downgrading to add_2_calendar: 2.2.4 solved this issue

[Ttkrommendijk]

Check, will try it out here! Thanks for the reply!

[Ttkrommendijk]

I'm working with flutterflow. By any chance you would know how to downgrade here?
I've changed the pubspec dependencies to ^2.2.4, I thought that would be sufficient.

Unfortunately still getting a built error for android( IOS is fine)

[jacobdedman]

You need to remove the ^. In pubspec a package defined as package-name: ^2.x.y allows any version >=2.x.y and <3.0.0. So defining it as ^2.2.4 still allows it to get any version >=2.2.4 and <3.0.0, so it grabs the highest version under 3.0.0 which is 2.2.5.

Fix:

add_2_calendar: 2.2.4

[jacobdedman]

You can check your pubspec.lock to see what versions of all your packages you are actually getting. If you check your add_2_calendar version in pubspec.lock with ^2.2.4 still in pubspec.yaml you will see that it is using 2.2.5. After changing it to 2.2.4 without ^ you should see it go down to 2.2.4 in pubspec.lock