How to Change the Default Java JDK Version on macOS?

How to Set or Change the Default Java (JDK) Version on macOS

Introduction:

To configure the default Java Development Kit (JDK) version on macOS, use the command-line utility /usr/libexec/java_home. This tool allows you to specify the desired JDK version, which will be used by the java command when not explicitly provided.

Command to List Available JDK Versions:

/usr/libexec/java_home -V

This command will display a list of installed JDK versions, along with their corresponding paths.

Example Output:

Matching Java Virtual Machines (3):
1.8.0_05, x86_64:   "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home
1.6.0_65-b14-462, x86_64:   "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
1.6.0_65-b14-462, i386: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

Setting the Default JDK Version:

To set the default JDK version, use the JAVA_HOME environment variable. Choose the desired version from the list displayed by /usr/libexec/java_home -V.

Setting a Specific Major Version:

To set the default JDK major version, specify the desired version using the following syntax:

export JAVA_HOME=`/usr/libexec/java_home -v 1.8`

This will set the default to Java 8.

Setting a Specific JDK Version:

To set a specific JDK version, specify the exact version number using the following syntax:

export JAVA_HOME=`/usr/libexec/java_home -v 1.8.0_05`

This will set the default to Java 8, version 1.8.0_05.

Verifying the Change:

To confirm the default JDK version has been set correctly, run the following command:

java -version

This command will display the version of the default JDK being used.

Modifying the Shell's Initialization Script:

To make the new default JDK version permanent, add the JAVA_HOME export line to the appropriate shell initialization script.

• Bash: ~/.bashrc
• Fish: ~/.config/fish/config.fish
• Zsh: ~/.zshrc

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