How to Resolve Unsupported Java Version Error in Flutter with Android Build

What steps can I take to fix the Unsupported Java version error in Flutter's Android build?

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

When developing Flutter apps for Android, you may encounter an error indicating that your build is configured to use an unsupported version of Java. Specifically, if you're using Java 17.0.2, you might see an error message related to compatibility with Gradle 7.0.2. This error often arises because certain versions of Gradle do not fully support the latest Java versions. The following steps will help you configure and resolve this issue effectively.

# Example of gradle-wrapper.properties modification:
distributionUrl=https://services.gradle.org/distributions/gradle-6.7.1-bin.zip

Causes

• Using an incompatible version of Java with your Gradle setup.
• Gradle version is not configured correctly to support the installed Java version.

Solutions

• Open your project's Gradle wrapper settings by navigating to the `gradle/wrapper/gradle-wrapper.properties` file.
• Modify the `distributionUrl` property to use a compatible Gradle version. For example: `distributionUrl=https://services.gradle.org/distributions/gradle-6.7.1-bin.zip` which supports Java 17.
• Ensure that your `JAVA_HOME` environment variable is set to the Java version you intend to use, compatible with Gradle.
• Run `flutter clean` followed by `flutter pub get` to clean the build and re-fetch the dependencies after making changes.

Mistake: Forgetting to check the compatibility between the Java and Gradle versions.

Solution: Always verify the official compatibility matrix for Gradle and Java versions before making changes.

Mistake: Not updating the `JAVA_HOME` variable after changing Java versions.

Solution: Ensure your `JAVA_HOME` points to the correct Java installation path.

Mistake: Ignoring cached build files which may retain previous configurations.

Solution: Run `flutter clean` to clear any cached configurations before rebuilding.