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  amp  amp    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    How could I find the internal Java inside the Android Studio folder so that I could point JAVA HOME to it  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

User · Answer

Please add the JAVA HOME in the System variable no in the user variable   Create the Variable name as JAVA HOME Please use these format in the value box --  C  Program Files Java jdk version  what you have or downloaded

User · Answer

All I did is go to my project directory from the cmd  command prompt  I typed java -version it told me what version it was looking for  so I Installed that version and I changed the path to were the jdk of that version was located

User · Answer

Make sure you have java installed your path is wrong    do this       export   grep JAVA   THE RESULT  what java home is set to  JAVA HOME  Library Java JavaVirtualMachines jdk1 8 0 202 jdk Contents Home    follow the path to see if the directories are correct    i did this in my terminal   open  Library   then i went to  Java JavaVirturalMachines turns out I had the wrong  jdk1 8 0 202 jdk  folder  there was another number     4  you can use this command to set java home  export JAVA HOME  Library Java JavaVirtualMachines jdk1 8 0 202 jdk Contents Home

User · Answer

For those still not able to set JAVA HOME from Android Studio installation  for me the path was actually not in C      Android Studio jre but rather in the     Android Studio jre jre  Don t ask me why though  Environment variables jre location snippet

User · Answer

It is located on the Android Studio folder itself  on where you installed it

User · Answer

I think the right way to find the internal Java used by the Android Studio is to   Open Android Studio Go to File- Other Settings- Default Project Structure JDK Location   and copy what ever string is specified there   This will not require memorising the folder or searching for java and also these steps wil take of any future changes to the java location by the Android Studio team changes I suppose

User · Answer

I ran this in the command prompt have windows 7 os   JAVA HOME C  Program Files Android Android Studio jre  where what its   to is the path to that jre folder  so anyone s can be different

User · Answer

I ll answer my own questions and sponfeed my fellow linux users   1- To point JAVA HOME to the JRE included with Android Studio first locate the Android Studio installation folder  then find the  jre directory  That directory s full path is what you need to set JAVA PATH to  thanks to  TentenPonce for his answer   On linux  you can set JAVA HOME by adding this line to your  bashrc or  bash profile files   export JAVA HOME  lt Your Android Studio path here gt  jre   This file  one or the other  is the same as the one you added ANDROID HOME to if you were following the React Native Getting Started for Linux  Both are hidden by default and can be found in your home directory  After adding the line you need to reload the terminal so that it can pick up the new environment variable  So type   source  HOME  bash profile   or  source  HOME  bashrc   and now you can run react-native run-android in that same terminal  Another option is to restart the OS  Other terminals might work differently   NOTE  for the project to actually run  you need to start an Android emulator in advance  or have a real device connected  The easiest way is to open an already existing Android Studio project and launch the emulator from there  then close Android Studio   2- Since what react-native run-android appears to do is just this   cd android  amp  amp    gradlew installDebug   You can actually open the nested android project with Android Studio and run it manually  JS changes can be reloaded if you enable live reload in the emulator  Type CTRL   M  CMD   M on MacOS  and select the  Enable live reload  option in the menu that appears  Kudos to  BKO for his answer

User · Answer

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

User · Answer

I fixed this issue by installing jre  I have jdk already installed but jre was not installed

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

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