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:
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?
Windows 10:
Android Studio -> File -> Other Settings -> Default Project Structure... -> JDK location:
copy string is shown, such as:
C:\Program Files\Android\Android Studio\jre
In the 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 the OK buttons to close out.
Some installations may also require JRE_HOME to be set in 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 supports spaces in the filename paths for system variables very well and does not need ~tilde eliding.
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=<Your Android Studio path here>/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 && ./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)
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
I'm using Ubuntu 20 on my machine, I have got the same problem the thing that worked for me was:
sudo apt-get install default-jre
you can verify that if the installation was successful or not by:
java --version
you are gonna see something like this in your terminal
openjdk 11.0.12 2021-07-20
OpenJDK Runtime Environment (build 11.0.12+7-Ubuntu-0ubuntu3)
OpenJDK 64-Bit Server VM (build 11.0.12+7-Ubuntu-0ubuntu3, mixed mode, sharing)
It is located on the Android Studio folder itself, on where you installed it.
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.
I fixed this issue by installing jre, I have jdk already installed but jre was not installed.
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
For ubuntu 16.0+
You can find the jre folder in android studio on this path /snap/android-studio/current/android-studio/jre
add the following line in your .bashrc or .bash_profile
export JAVA_HOME=/snap/android-studio/current/android-studio/jre
type
sudo nano $HOME/.bashrc
or
sudo nano $HOME/.bash_profile
after this execute the following line to in your terminal where you are executing the npx react-native run-android to reload the terminal with the new changes
source $HOME/.bashrc
or
source $HOME/.bash_profile
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 .
apparently the system variables were not in sync with the user
variables
run as admin on command prompt and set the variable
i also saw some tips to close the node window and the vscode terminal for
the variable to take effect
tip from this site
https://confluence.atlassian.com/doc/setting-the-java_home-variable-in-windows-8895.html
setx -m JAVA_HOME "C:\Progra~1\Java\jdk1.8.0_XX"
and then
echo %JAVA_HOME%
For fish users:
Open ~/.config/fish/config.fish;
Include line set JAVA_HOME /home/ronald/Documents/android-studio/jre and set PATH $PATH $JAVA_HOME;
Re-open fish terminal.
Welcome :)
After adding the environmental variable , please restart the editor. It may save your ton of time.
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
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.
what I did to solve this on windows was to go to the environment variables and set the variable name to JAVA_HOME and then set the variable value to C:\Program Files\OpenJDK\openjdk-8u312-b07
then I set the path to C:\Program Files\OpenJDK\openjdk-8u312-b07\bin
From Android Studio, go to File, Settings, "Build, Execution, Deployment", Build Tools, Gradle. You should see the path to your JDK there, as visible in the screenshot (tested on Android Studio version 2020.3.1). Set an environment variable called JAVA_HOME containing that path (just google "set an environment variable" and followed by your Operating System name).
for those who are new to react native development
please set JAVA_HOME like this
instead of
C:\Program Files\Java\jdk1.8.0_301\bin
just remove "\bin" from path
C:\Program Files\Java\jdk1.8.0_301 after removing \bin
Guys after fight a lot to find the solution, including pass for many of that articles. I just realized that when you extract the Android SDK it doesn't come inside the folder cmdline-tools/latest and doesn't matter the place that I put the folder, opt/Androd_SDK, $HOME/Android_SDK the sequence of the error were the same. Until I got this error running:
➜ bin ./sdkmanager -version
Error: Could not determine SDK root.
Error: Either specify it explicitly with --sdk_root= or move this package into its expected location: /cmdline-tools/latest/
So, basic the solution was add the content of the SDK zip inside of the folders cmdline-tools/latest.
Once you do this, SDK and all the commands will work normally. Just don't forget to finish the configuration, like create the environment of the Android SDK, JAVA and so on.
An awesome article is that one:
https://medium.com/#khairold/setting-up-react-native-on-linux-without-android-studio-a65f3e011bbb
;)
if someone still facing similar issue and looking for an answer for the same? I would like to share the solution which worked for me. And by the way I haven't installed JAVA JDK/SDK in order to resolve the issue.
I am using Visual Studio code to develop react-native apps (using nox player for android app testing), I ran into the similar issue:
Issue:
$
› Building app...
$
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.
C:\Users...\android\gradlew.bat exited with non-zero code: 1
Resolution: In package.json file I have changed "main": "index.js" to "main": "node_modules/expo/AppEntry.js" it worked for me.
It would be great if this solution helps anyone, let me know for any additional information.
Make sure you have installed the following:
Java
JDK
JRE
If you use Ubuntu, maybe its helpful this tutorial. You have solution for how to solve error ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH..
There are many solutions found for Windows or Mac OS on internet to resolve this error. I'm using Ubuntu 22.10 kinetic
Solution:
Go to your Android Studio folder, find folder named jbr, copy all content folder, and if you don't have, create a folder named jre and copy in jre folder, all contents from jbr folder. Case close. Error solved.
java is not set
Video
Trying to use Phonegap in Eclipse on windows 8. I've created a project at C:\Development\HelloWorld. In the command line, when I type:
phonegap local build android
I get the following error:
An error occurred during creation of android sub-project. ERROR : executing command 'ant', make sure you have ant installed and added to your path.
My PATH:
C:\Program Files\nodejs\;C:\Development\adt-bundle\sdk\platform-tools;C:\Development\adt-bundle\sdk\tools;%JAVA_HOME%\bin;%ANT_HOME%\bin;
Whats going wrong? I have downloaded Ant into my Development folder and all other necessary downloads are downloaded as well. Any help would be appreciated.
I was following Phonegap's platform guide for Android and I kept getting the above error. The directions on the guide were a little confusing. I went back to check what I had installed and found some configuration errors.
Under Environment Variables, I created new ANDROID_HOME, ANT_HOME, and JAVA_HOME system variables with the respective physical file paths as the value. This part may be overkill, but I was trying to cover my bases and I have noticed no significant issues with it so far.
Example:
Variable: ANDROID_HOME Value: C:\Development\adt-bundle\sdk
Variable: ANT_HOME Value: C:\Development\apache-ant-1.9.2
Variable: JAVA_HOME Value: C:\Program Files\Java\jdk1.6.0_45
Next I added the following values to the Path system variable in Environment Variables:
%JAVA_HOME%\bin;%ANT_HOME%\bin;%ANDROID_HOME%\platform-tools;%ANDROID_HOME%\tools;
After making these changes and continuing to follow the guide, everything worked like it should. It boiled down to not having my system variables set to the correct physical file path.
Check android in cmd, if it says: 'xcopy' was not recognized.
then add to your path:
%SystemRoot%\system32; %SystemRoot%; %SystemRoot%\System32\Wbem;
Just as a extra note to Rex_C's answer: Be sure to reference the Java Development Kit (JDK) and not the Java Runtime Environment (JRE) in the JAVA_HOME variable. This will prevent the
Command failed to execute : ant jar
error when running phonegap->android.
When I started to develop android project in Android Studio, I noticed that there is no
Clean project
section.
So I tried to gradlew clean command in the terminal embedded to Android Studio.
But I got this error: JAVA_HOME is set to an invalid directory
I don't understand, should I also set a gradle path to clean it?
I changed the path and remove the double slash but I still get the same error
As shown in the picture your JAVA_HOME variable is pointing to the bin directory. Please remove the bin it should point the root directory of your jdk
it should look like
C:\Program Files\Java\jdk1.7.0_25
You have to set the JAVA_HOME enviroment variable.
Either fix your JAVA_HOME environment or update to the latest version of Android Studio. I believe that they already removed the hassle of setting complicated things like that.
Simple tutorial on how to set the JAVA_HOME variable.
I am building an Android project with Eclipse and maven plugins. When I build it I get the error as following
27/1/12 2:34:02 PM IST: Build errors for ProjectName;
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to
execute goal
com.jayway.maven.plugins.android.generation2:maven-android-plugin:2.2.1:generate-sources
(default-generate-sources) on project ProjectName: Execution
default-generate-sources of goal
com.jayway.maven.plugins.android.generation2:maven-android-plugin:2.2.1:generate-sources
failed: Please provide a proper Android SDK directory path as
configuration parameter <sdk><path>...</path></sdk> in the plugin
<configuration/>.
As an alternative, you may add the parameter to commandline:
-Dandroid.sdk.path=... or by setting environment variable ANDROID_HOME
Even if I have set the ANDROID_HOME and path in <sdk><path>...</path></sdk>
Besides ANDROID_HOME environment variable, you also need add $ANDROID_HOME/tools and $ANDROID_HOME/platform-tools to your PATH environment variable:
Maven 3.0.3+ installed, see http://maven.apache.org/download.html
Set environment variable ANDROID_HOME to the path of your installed Android SDK and add $ANDROID_HOME/tools as well as $ANDROID_HOME/platform-tools to your $PATH. (or on Windows %ANDROID_HOME%\tools and %ANDROID_HOME%\platform-tools).
MacOS users: Note that for the path to work on the commandline and in IDE's started by launchd you have to set it in /etc/launchd.conf and NOT in .bashrc or something else
Check out the Getting Started page on android maven plugin website here.
Hope this help.
You also need to set the path location of the Android SDK in Eclispe as well, otherwise the m2e-android build will fail:
Go to Window -> Preferences and select Android. Click on the Browse... button next to the SDK Location text box and select the location of you locally installed Android SDK. Click Apply and then OK and your build should now work.