React Native error: “Could not determine java vers

Question

I'm working on MacOS and just starting with react-native.

One of the first steps to get started is to run: react-native run-android or react-native run-ios. But I'm getting this error:

react-native run-android

Result:

Scanning folders for symlinks in /Users/ric/myprojs/albums/node_modules (6ms)
Starting JS server...
Building and installing the app on the device (cd android && ./gradlew installDebug)...

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine java version from '9.0.1'.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html

This is what I get when I run java --version:

java --version

Result:

java 9.0.1
Java(TM) SE Runtime Environment (build 9.0.1+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)
mbp:albums ric$ java --version
java 9.0.1
Java(TM) SE Runtime Environment (build 9.0.1+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)

Edit

My javac version:

javac --version

Result:

javac 9.0.1

Any idea on how to fix this?

Answer 1

In your PROJECT_PATH/android/gradle/wrapper/gradle-wrapper.properties file, update your distributionUrl to the following:

distributionUrl=https\://services.gradle.org/distributions/gradle-5.0-all.zip

See related gradle distributions documentation

Answer 2

vi ~/.bash_profile

Then add the following lines:

export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools
export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)

Now source the file to make the above changes effective in the current shell:

source ~/.bash_profile 

Answer 3

I was getting this error, but for a more recent version of Java - 10.0.2.

To fix my error, I followed the steps mentioned by @Blacktoviche in this Github issue: https://github.com/facebook/react-native/issues/17688

When I opened the android folder inside my project via Android Studio, I was prompted with Android Gradle plugin update recommended. At the time, I was following a slightly outdated tutorial that told me to click Don't remind me again for this project.

However, as @Blacktoviche recommended in the github issue linked above, sometimes it's necessary to update the Gradle plugin. After updating, I also had to click Install Build Tools 27... and sync project (I don't remember the exact version).

After I followed these steps, I was able to successfully run my react native app on the Android Studio emulator.

Hope this helps someone!

Answer 4

I usually get this error when I forget to build the project using Android Studio. A simple sync and upgrading Gradle will do the work.

Answer 5

React Native does not work with Java versions higher than 8, so you need to uninstall your 9.0.1 version. To do so, execute the following commands:

cd /Library/Java/JavaVirtualMachines/
ls -l

Identify the folder containing your Java Version, then remove it

sudo rm -rf jdk.x.x_xxx.jdk

After that you can download and install java 8 from oracle again. Refer to jdk8 download page

Answer 6

Make sure that you have JDK8 installed and then set JAVA_HOME into JDK8

for example:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home

or use .bash_* files to set this variable