Installing OpenJDK 11 on MacOS
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Join For FreeIf you download the .tar.gz for OpenJDK 11 directly from http://jdk.java.net/11/, there’s no obvious installation instructions (at least that I could find) on the OpenJDK website or in the .gz file. If you’ve done any fiddling with different JDK versions on MacOS before, you’ve probably come across the ‘/usr/libexec/java_home’ utility, which composes a number of useful things relating to the JDK that you’re currently using in your PATH. Click here for my previous article about this utility and answers to this StackOverflow post, which includes one of the most extensive and useful guides to running different JDK versions on MacOS that I’ve seen.
/usr/libexec/java_home: This will show you where the current JDK home is, for example:
/Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home/usr/libexec/java_home -V: This lists all installed JDKs, which is shown below:
$ /usr/libexec/java_home -V
Matching Java Virtual Machines (2):
10, x86_64: "Java SE 10" /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home
1.8.0_151, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/HomeTo switch between JDKs, use /usr/libexec/java_home -v version (e.g. 10):
$ /usr/libexec/java_home -v 1.8.0_151
/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/HomeKnowing that your available JDKs are installed to /Library/Java/JavaVirtualMachines/ by default, moving the contents of the downloaded OpenJDK 11 dir from inside the .gz file to the same location would make sense.
Once you’ve moved it there, java_home -V now shows the new JDK in place:
$ /usr/libexec/java_home -V
Matching Java Virtual Machines (3):
11, x86_64: "OpenJDK 11" /Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home
10, x86_64: "Java SE 10" /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home
1.8.0_151, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/HomeUpdating my aliases to quickly switch versions in my .bash_profile, I now have:
alias j11="export JAVA_HOME=/usr/libexec/java_home -v 11; java -version"
alias j10="export JAVA_HOME=/usr/libexec/java_home -v 10; java -version"
alias j8="export JAVA_HOME=/usr/libexec/java_home -v 1.8; java -version"Sourcing the .bash_profile (source .bash_profile) and then running each alias, now I’ve got OpenJDK 11 set up and ready to go!
$ j11
openjdk version "11" 2018-09-25
OpenJDK Runtime Environment 18.9 (build 11+28)
OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)Published at DZone with permission of Kevin Hooke, DZone MVB. See the original article here.
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