Some homebrew packages require extra steps and they are easy to miss.
Java/JDK
Issue
On MacOS, when using brew to install certain packages, like openapi-generator, will pull in java as dependency.
However when executing java from command line, error pop up:
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$ java -version
The operation couldn’t be completed. Unable to locate a Java Runtime.
Please visit http://www.java.com for information on installing Java.
$ java -version
openjdk version "18.0.1.1" 2022-04-22
OpenJDK Runtime Environment Homebrew (build 18.0.1.1+0)
OpenJDK 64-Bit Server VM Homebrew (build 18.0.1.1+0, mixed mode, sharing)
Where is that information
Most brew packages display extra steps during installation, if required. However, they are easy to miss when installing multiple packages. The information will be buried inside all the output.
To show that information, we can use brew info <package>. Example:
openjdk: stable 18.0.1 (bottled) [keg-only]
Development kit for the Java programming language
https://openjdk.java.net/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/openjdk.rb
License: GPL-2.0-only with Classpath-exception-2.0
==> Dependencies
Build: autoconf ✘
==> Requirements
Build: Xcode ✔
Required: macOS >= 10.15 ✔
==> Caveats
For the system Java wrappers to find this JDK, symlink it with
sudo ln -sfn /usr/local/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk
openjdk is keg-only, which means it was not symlinked into /usr/local,
because macOS provides similar software and installing this software in
parallel can cause all kinds of trouble.
==> Analytics
install: 184,767 (30 days), 621,114 (90 days), 2,377,395 (365 days)
install-on-request: 48,734 (30 days), 172,952 (90 days), 673,642 (365 days)
build-error: 379 (30 days)
The information is at line 14.
So next time when a package from brew doesn’t work, give brew info a try.
