How can I build my Gradle project using a Windows JDK from Ubuntu on Windows?

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My Windows 10 machine recently forcibly upgraded me to the new "Creators Update" version of windows, the "About your PC" widget now reports my OS version as "1703".

I thought I would have a crack at using the Windows Subsystem for Linux / Ubuntu on Windows to compile my Gradle projects.

I have a Windows JDK installed at c:\jvm\jdk1.8.0_102.

In my MinGW terminal window ("git bash"), I can setup a JAVA_HOME and execute the gradle wrapper script from my source directory and it will just work:

export JAVA_HOME=/c/jvm/jdk1.8.0_102
./gradlew tasks

But I can't figure out how to do an equivalent thing with WSL. Opening up the "Bash on Ubuntu on Windows" terminal, changing to my source directory and invoking the following:

export JAVA_HOME=/mnt/c/jvm/jdk1.8.0_102
./gradlew tasks

Results in the following:

ERROR: JAVA_HOME is set to an invalid directory: /mnt/c/jvm/jdk1.8.0_102

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.

Note that the Windows JDK runs fine from within the bash terminal. Executing $JAVA_HOME/bin/java.exe -version in the Ubuntu terminal will work fine.

The question is:

Is there any way to run my gradlew script from a "Bash on Ubuntu on Windows" terminal using the Windows JDK I've previously installed.

Please note:

I'm specifically asking if it's possible to get my Gradle script running using the Windows JDK, not an Ubuntu/Linux JDK installed with WSL. I understand I can likely run my gradle wrapper script by installing a Linux JDK within the Windows Sunbsystem for Linux, but I'm trying to figure out if it's possible to run my builds using the Windows JDK.

windows-subsystem-for-linux gradle windows bash java
3 Answers

Just to make sure I didn't miss anything obvious, I downloaded Android Studio (which contains JDK, or rather, minimal set of Java tools to build Android projects) for Windows and Linux and installed them to 2 different directories: Windows version in C:\Program Files\Android\Android Studio and Linux version in ~/android-studio.

Inside WSL, I first set JAVA_HOME to C:\Program Files\Android\Android Studio\jre and ran gradlew. It gave me invalid directory error message.

Next, I set JAVA_HOME to ~/android-studio/jre. Everything worked as expected.

And then I copied Android Studio for Windows to ~/android-studio-windows and set JAVA_HOME to ~/android-studio-windows/jre. It gave me the same invalid directory error message, so I think WSL isn't able to use Windows tools as they are (well, at least not for the moment).

So, if your goal is to use gradle in WSL, I think you need to install OpenJDK for Linux (or something similar) inside WSL.

user_49579150

If you are using WSL and you want to run gradlew from WSL terminal then you can do it as follow:

cmd.exe /c gradlew --version
cmd.exe /c gradlew :help
cmd.exe /c gradlew app:dependencies
cmd.exe /c gradlew app:dependencies | grep -i "com.android.support"

I'm using windows version:

rdey@surface-book:/mnt/c/Users/rdey/git/ici$ cmd.exe /c "systeminfo" | grep "^OS Version"
OS Version:                10.0.17763 N/A Build 17763
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