Update II - 2019-05-07: It looks like due to the recent licensing changes, the Java 8 JDK that brew used is not directly accessible anymore and likely behind some kind of paywall. The installation method described below will still work as it uses the non-versioned java cask, which installs the latest version of OpenJDK.
_Update: The title of this post isn’t quite correct as using the homebrew cask mentioned in this blog post will install the current major version of the Oracle JDK. If you want to install a specific major version of the JDK (6 or 8 at the time of writing), I describe how to do that in this new blog post.
I’ve had a ‘manual’ install of JDK 8 on my Mac for quite a while, mainly to run Clojure. It was the typical “download from the Oracle website, then manually run the installer” deployment. As I move the management of more development tools from manual management over to homebrew, I decided to use homebrew to manage my Java installation also. It’s just so much easier to get updates and update information all in one place. Oh, and installs the same JDK anyway, just without all the additional pointy clicky work.
Removing the existing installation
Fortunately Oracle has uninstall instructions on their website. It’s a rather manual approach but at least it is documented and the whole procedure consists of three commands. Unfortunately in my case this didn’t end up uninstalling an older version of the JDK. For some reason, I had ended up with both 1.8.0_60 and 1.8.0_131 installed on my machine, and Oracle’s uninstall instructions didn’t touch the 1.8.0_60 install in /System/Library/Frameworks/JavaVM.framework. I suspect this is an older JDK brought over from the Yosemite install and the consensus on the Internet I could find suggest to leave that alone as the system needs those.
Apparently in older versions of OS X it was possible to run /usr/libexec/java_home -uninstall to get rid of a Java install, but that option does not appear to work in OS X Sierra anymore.
Installing Java using Homebrew
The installation via homebrew is about as simple as expected. I have cask installed already, so for me it’s a simple matter of running
my-machine:~ brew cask install java
and it will install the latest Oracle JDK. You can use
my-machine:~ brew cask info java
to verify which version it will install.
If you haven’t got homebrew installed, follow the installation instructions and also make sure that you install cask:
my-machine:~ brew tap caskroom/cask
After re-installing the JDK using homebrew, java_home also finally reports the correct version:
my-machine:~ timo$ /usr/libexec/java_home