问题
I know this question has been asked a lot before but i did read and i will show you what i got.
I will list the commands that i did in my OS X Yosemite 10.10.1
java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
java -fullversion
java full version "1.8.0_45-b14"
which java
/usr/bin/java
Java home variable is not set because when I do this: echo $java_home or echo $JAVA_HOME or echo $Java_Home i got nothing on the terminal.
when doing this: ls -l which java i got this:
8 lrwxr-xr-x 1 root wheel 74 Nov 12 2014 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
javac -version
javac 1.8.0_45
/usr/libexec/java_home
/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home
The solution that I think is correct after reading on internet is
echo "export JAVA_HOME=`/usr/libexec/java_home`" >> ~/.profile
but i am afraid to test it, that is why i am asking you, if that is correct or not and if not what should i do please?
回答1:
I'm not sure why you are afraid to test, you can safely test this:
In your terminal session, input the following:
echo "export JAVA_HOME=`/usr/libexec/java_home`"
This will print the following line:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home
Copy the above and paste it into your terminal window, then press enter key. and execute java -version to see it work correctly. If everything is okay, you can attach the code into your .profile:
But adding this line directly is better idea because you don't have to update .profile when you upgrade JDK.
export JAVA_HOME=`/usr/libexec/java_home`
Please refer to the man page for the java_home tool. In short, it provides the appropriate path for JAVA_HOME for a normal installation on macOS
来源：https://stackoverflow.com/questions/30454505/how-should-i-set-the-java-home-environment-variable-on-macos