When creating a new Flutter app, you might encounter compatibility issues between the Java Development Kit (JDK) version and the Gradle version used in your project. Here’s how to address this and ensure a smooth setup
Issue Overview
You may encounter the following message:
The configured version of Java detected may conflict with the Gradle version in your new Flutter app.
This occurs because the default Android Gradle Plugin (AGP) version requires a specific Java version to work correctly. For example, Gradle version 8.3 requires Java versions in the range:
Java 17 <= compatible Java version < Java 21
If your system is using an incompatible Java version, you need to either:
- Configure Flutter to use a compatible Java version, or
- Update the Gradle version in your project to match your current Java version.
Solution 1: Configure Flutter to Use a Compatible Java Version
To resolve this issue, you can specify a compatible JDK version for Flutter. Follow these steps:
Step 1: Check Installed Java Versions
Run the following command to list all installed Java versions on your system:
/usr/libexec/java_home -V
Example output:
Matching Java Virtual Machines (3):
17.0.8 (arm64) “Oracle Corporation” - “/Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home”
20.0.2 (arm64) “Oracle Corporation” - “/Library/Java/JavaVirtualMachines/jdk-20.jdk/Contents/Home”
11.0.19 (arm64) “Oracle Corporation” - “/Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home”
Step 2: Choose a Compatible Java Version
Select a Java version compatible with Gradle 8.3. For instance, Java 17 is a good choice. Note its path, e.g.:
/Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home
Step 3: Configure Flutter to Use the Chosen Java Version
Run this command to configure Flutter:
flutter config --jdk-dir=/Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home
Step 4: Verify Configuration
To ensure Flutter is using the specified JDK, run:
flutter doctor
Look for the following line in the output:
[!] Android toolchain - develop for Android devices (Android SDK version X.X.X)
JDK location: /Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home
If it matches the path you set, the configuration is successful.
Solution 2: Update Gradle Version
If you prefer to use your currently configured Java version, you’ll need to update the Gradle version in your Flutter project.
Step 1: Modify gradle-wrapper.properties
Navigate to the gradle-wrapper.properties file in your project directory:
/Users/javeedishaq/devwork/demoapp327/android/gradle/wrapper/gradle-wrapper.properties
Update the Gradle version to one that is compatible with your Java version (e.g., Gradle 8.4 to 8.7).
Example:
distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
Step 2: Update Gradle Wrapper
Alternatively, you can use the Gradle Wrapper command to update the version:
./gradlew wrapper --gradle-version=8.7
Step 3: Verify the Update
Run the project again to confirm that the Gradle and Java versions are compatible:
flutter run
Additional Resources
By following these steps, you can resolve Java and Gradle compatibility issues effectively and continue developing your Flutter app without interruptions.
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