Failed to find 'JAVA_HOME' environment variable. Try setting it manually

问题

I'm trying to run a sample app on my android device with the following command :

sudo ionic cordova run android --device

I'm getting this error :

Failed to find 'JAVA_HOME' environment variable. Try setting it manually.
[ERROR] An error occurred while running subprocess cordova.

        cordova build android --device exited with exit code 1.

        Re-running this command with the --verbose flag may provide more information.

I already set the JAVA_HOME environment variable but that doesn't work .

~/Ionic/helloWorld$ echo $JAVA_HOME 
/usr/lib/jvm/java-12-openjdk-amd64

Any recommendations ?

回答1:

Your $JAVAHOME is pointing to the correct location. But the path should have $JAVAHOME/bin directory and not $JAVAHOME itself.

JAVA_HOME="/opt/jdk1.12.0"
export JAVA_HOME
PATH="$PATH:$JAVA_HOME/bin"

You should consider using the Oracle Java PPA instead. It usually does more than what a manual installation would do. You don't have to worry about setting up the environment variables either. That's what most people use.

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

Try running java -version and javac -version to verify that the path is set.

Hope it helps.

回答2:

You have installed java OpenJDK you should install the Java SE. You can find your system-specific JDK here.

Your JAVA_HOME should look like following

/usr/lib/jvm/java-8-oracle (I have java 8 , you can have any version)

回答3:

I have debian 10 and i solve this problem installing openjdk 1.8. And then you have to run:

sudo update-alternatives --config java

sudo update-alternatives --config javac

You don't need to set JAVA_HOME because with update-alternatives java and javac are linked to bin.

来源：https://stackoverflow.com/questions/58356094/failed-to-find-java-home-environment-variable-try-setting-it-manually