What to do if build from command line fails in Android development environment

Premise

Events and causes

A project created in Android Studio can be fully built by executing the following command at the top of the directory.

gradlew.bat assemble

However, depending on the environment, the following error may be displayed.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugKotlin'.
> Kotlin could not find the required JDK tools in the Java installation 'C:\Program Files\Java\jre1.8.0_181' used by Gra
dle. Make sure Gradle is running on a JDK, not JRE.

...(Omission)...

BUILD FAILED in 3s
13 actionable tasks: 13 executed

This is because, as shown in the error message, the ** JDK ** required for the build is not in the path, but the ** JRE ** is in the path.

--JDK = Java Development Kit: Library for developing applications in Java --JRE = Java Runtime Environment: Library for running Java applications

solution

Search for "path" from the Start menu to launch "Edit System Variables" and click "Environment Variables" システムプロパティ.png

Click "New" in "System Variables" at the bottom of the screen 環境変数.png

Set the path of the JDK installed with the variable name JAVA_HOME to the variable value and click OK 環境変数追加.png

Reboot the command line and hit the same command again to see if you can build

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