How to uninstall Java JDK installed without management tools on Mac

1. DeleteJDK

• View local Java JDKinstallation location

  $ /usr/libexec/java_home -V
  

  Matching Java Virtual Machines (1):
  
      21.0.1 (arm64) "Oracle Corporation" - "Java SE 21.0.1" /Library/Java/JavaVirtualMachines/jdk-21.jdk/Contents/Home
  
  /Library/Java/JavaVirtualMachines/jdk-21.jdk/Contents/Home
  

  The location is just that /Library/Java/JavaVirtualMachines/jdk-21.jdk, the subsequent paths are not needed.

• then delete

  $ sudo rm -rf /Library/Java/JavaVirtualMachines/jdk-21.jdk
  

• Plug-in deletion status

  $ java --version
  

  It says Javathe environment cannot be found

  

2. Manually delete other related files

• In addition to uninstalling JDKitself, you can also clean the entire system by manually deleting other related files. These files include JRE、Java 插件, Java Web启动器, Java Web Start, Java Preferencesand Java Cacheetc. Here are some useful commands and scripts to help delete these files manually.

• deleteJRE

  If you want to remove the JRE, follow these steps, first close all applications that are using the JRE. Then enter the following command:

  sudo rm -rf /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
  sudo rm -rf /Library/LaunchAgents/com.oracle.java.Java-Updater.plist
  sudo rm -rf /Library/PrivilegedHelperTools/com.oracle.java.JavaUpdateHelper
  sudo rm -rf /Library/LaunchDaemons/com.oracle.java.JavaUpdateHelper.plist
  sudo rm -rf /Library/PreferencesPanes/JavaControlPanel.prefPane
  sudo rm -rf ~/Library/Application\ Support/Oracle/Java
  

  After executing this command, the JRE will be completely deleted.

• deleteJava 插件

  If you want to delete Java 插件, please follow the steps below, first close all Java插件the applications you are using. Then enter the following command:

  sudo rm -rf /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
  sudo rm -rf /Library/PreferencePanes/JavaControlPanel.prefPane
  

  After executing this command, Java 插件it will be completely deleted.