Incorrect JAVA_HOME setting when selecting system JDK on macOS

[michelemadonna]

Description:

When selecting the system JDK on macOS using asdf-java, the JAVA_HOME environment variable is incorrectly set to /usr/bin/java. However, on macOS, the correct value for JAVA_HOME should be /usr/libexec/java_home.

This issue can be easily resolved by introducing a simple logic update in the set-java-home.* files to correctly handle the system JDK case.

Steps to Reproduce:

Install asdf-java and ensure it is correctly configured.

Set the system JDK using asdf set -u java system (for global) or asdf set java system for (local).

Check the JAVA_HOME environment variable (echo $JAVA_HOME).

Notice that it is set to /usr/bin/java instead of /usr/libexec/java_home.

Expected Behavior:

When selecting the system JDK on macOS, JAVA_HOME should be set to /usr/libexec/java_home to ensure proper Java environment configuration.

Proposed Solution:

Modify the set-java-home.* scripts to check for macOS and correctly set JAVA_HOME to /usr/libexec/java_home when the system JDK is selected.

asdf_update_java_home() {
  local java_path
  java_path="$(asdf which java)"
  if [[ -n "${java_path}" ]]; then
    export JAVA_HOME
    if [[ "$OSTYPE" == "darwin"* && "${java_path}" == "/usr/bin/java" ]]; then
    	JAVA_HOME="$(/usr/libexec/java_home)"
    else	
    	JAVA_HOME="$(dirname "$(dirname "${java_path:A}")")"
    fi
    export JDK_HOME=${JAVA_HOME}
  fi
}

autoload -U add-zsh-hook
add-zsh-hook precmd asdf_update_java_home

Environment:

OS: macOS 15.3.2
asd version 0.16.7
asdf-java version: latest
Java version: system (Oracle JDK 21 installed using brew)