React Native: JAVA_HOME is not set and no 'java' command could be found in your PATH

Question

I've followed step by step the official Getting Started. I started from a clean linux install and installed everything required as per the "Building Projects with Native Code" tab. I have also read the troubleshooting section. I've already created the project using the terminal.

This is the error when I run react-native run-android:

    Starting JS server...     Building and installing the app on the device (cd android && ./gradlew installDebug)...      ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.      Please set the JAVA_HOME variable in your environment to match the     location of your Java installation.      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 

It does not find JAVA_HOME because the latest versions of Android Studio don't require Java to be installed in the system. Instead an internal JRE is used.

Duplicate disclaimer: I've already read this question. This is not what I want. I know how to set the Java home. I just want to run the react project WITHOUT having to install a separate Java.

Questions:

1. How could I find the internal Java inside the Android Studio folder so that I could point JAVA_HOME to it?
2. If not possible, could I open and run the project inside the android folder with Android Studio? How would I refresh this project after modifying the React JavaScript code in the parent folder?

Answer 1

Windows 10:

Android Studio -> File -> Other Settings -> Default Project Structure... -> JDK location:

copy string shown, such as:

C:\Program Files\Android\Android Studio\jre 

In file locator directory window, right-click on "This PC" ->

Properties -> Advanced System Settings -> Environment Variables... -> System Variables

click on the New... button under System Variables, then type and paste respectively:

.......Variable name: JAVA_HOME

.......Variable value: C:\Program Files\Android\Android Studio\jre

and hit OK buttons to close out.

Some installations may require JRE_HOME to be set as well, the same way.

To check, open a NEW black console window, then type echo %JAVA_HOME% . You should get back the full path you typed into the system variable. Windows 10 seems to support spaces in the filename paths for system variables very well, and does not seem to need ~tilde eliding.