Where Is Java_Home on MACos Mojave (10.14) to Lion (10.7)

Where is JAVA_HOME on macOS Mojave (10.14) to Lion (10.7)?

With the Java optional package or Oracle JDK installed,
adding one of the following lines to your ~/.bash_profile file will set the environment variable accordingly.

export JAVA_HOME="$(/usr/libexec/java_home -v 1.6)"
or
export JAVA_HOME="$(/usr/libexec/java_home -v 1.7)"
or
export JAVA_HOME="$(/usr/libexec/java_home -v 1.8)"
or simply
export JAVA_HOME="$(/usr/libexec/java_home)"

Note: If you installed openjdk on mac using brew, run sudo ln -sfn /usr/local/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk for the above to work

Update: added -v flag based on Jilles van Gurp response.

What should I set JAVA_HOME environment variable on macOS X 10.6?

I just set JAVA_HOME to the output of that command, which should give you the Java path specified in your Java preferences. Here's a snippet from my .bashrc file, which sets this variable:

export JAVA_HOME=$(/usr/libexec/java_home)

I haven't experienced any problems with that technique.

Occasionally I do have to change the value of JAVA_HOME to an earlier version of Java. For example, one program I'm maintaining requires 32-bit Java 5 on OS X, so when using that program, I set JAVA_HOME by running:

export JAVA_HOME=$(/usr/libexec/java_home -v 1.5)

For those of you who don't have java_home in your path add it like this.

sudo ln -s /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java_home /usr/libexec/java_home

References:

• Oracle explains the java_home command

• An article for configuring the JDK in Spring Tool Suite (Eclipse
  2019) on MacOS

How to set JAVA_HOME environment variable on macOS?

in .bash_profile:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.xx/Contents/Home

Default directory of Java 7 on Mountain Lion

Should be:
/Library/Java/JavaVirtualMachines

And don't forget, you may not be seeing it because the LIB folder is hidden.... with every update of OSX So use:

chflags nohidden ~/Library/

to unhide.

Permission Error When Exporting to $JAVA_HOME on MacOS Big Sur

The $(foo) bit means, loosely, "run foo as a program, then insert its output here and go on as if I had typed it", which is not what you want here. Just do

export JAVA_HOME=/Library/Java/...

The $() bit is useful when you use the Mac's Java selection mechanism, and run e.g.

export JAVA_HOME=$(/usr/libexec/java_home -v16)

In that case, you're running a program, and setting JAVA_HOME to the output of that program.

java_home issue on macbook 12.3.1 Monterey (M1)

Unfortunately, java_home only looks for runtimes in 2 locations:

• $HOME/Library/Java/JavaVirtualMachines
• /Library/Java/JavaVirtualMachines

A symlink works but will need to be kept up-to-date as homebrew upgrades:

$ ln -sf /opt/homebrew/Cellar/openjdk@11/11.0.15/libexec/openjdk.jdk ~/Library/Java/JavaVirtualMachines/openjdk11

It then appears in the list in its original location:

$ /usr/libexec/java_home -V
Matching Java Virtual Machines (3):
    18.0.1.1 (arm64) "Homebrew" - "OpenJDK 18.0.1.1" /opt/homebrew/Cellar/openjdk/18.0.1.1/libexec/openjdk.jdk/Contents/Home
    11.0.15 (arm64) "Homebrew" - "OpenJDK 11.0.15" /opt/homebrew/Cellar/openjdk@11/11.0.15/libexec/openjdk.jdk/Contents/Home
    1.8.0_332 (arm64) "Azul Systems, Inc." - "Zulu 8.62.0.19" /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home
/opt/homebrew/Cellar/openjdk/18.0.1.1/libexec/openjdk.jdk/Contents/Home

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