Mac OS Oracle/MSSQL/MySQL

How to install Java Runtime Environment on Mac OS

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Java Runtime Environment is often referred to as the Java Runtime, Runtime Environment, Runtime, JRE, Java Virtual Machine, Virtual Machine, Java VM, JVM, VM, Java plug-in, Java plugin, Java add-on, or Java download. JRE allows some applications written in the Java programming language to launch via some browsers. It is vital to the intranet applications and other e-business solutions that are the foundation of corporate computing. This means, that if you must run a Java program you need JRE. Kindly refer to these related guides: How to install Apache Tomcat on Ubuntu, How to Install Jenkins Automation Server on Ubuntu 20.04 LTS, and How to Setup SonarLint in VS Code for your App Project.

Starting with Mac OS 10.7 (Lion), the Java runtime is no longer automatically installed as part of the operating system installation. 
- Mac OS X 10.6 and below: Apple's Java comes pre-installed with your Mac OS. You will find a lot of information in this link.

There are times you may find yourself installing Java (JRE) regardless of the version on your device because it is a prerequisite to have another application (IBM SPSS)installed. In my case, I needed to download and have SPSS installed. At the time of writing this piece, Java 6, version 8 is the latest release.

What can happen if Java Runtime isn’t installed

If Java Runtime is not installed, the following problems may occur as already discussed in the first block above.
– Launch failure.
– Prompts to install the Java runtime if you wish to use the applications.
– Applications are blocked or terminated as the case may be!

This software can be downloaded from the following link. You may also want to take a look at the Java License Update to determine if you are allowed to run it free of charge. Upon clicking on the download link, the following page below will be displayed. Click on Agree and start free download as shown below.

Note: Before the file can be downloaded, you must accept the license agreement.
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This will download the JRE .dmg file as shown below. To launch it, double-click on the file.

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The window below shows the app is from an unidentified developer. This means this app isn’t registered by Apple and does not mean something is wrong with the App. Because I trust it, I will click on open.

If you wish to override your security settings and open the app anyway follow these steps
- In the Finder on your Mac, locate the app you want to open
- Control-click the app icon, then choose Open from the shortcut menu
- Click Open

Hence, the app will be saved as an exception to your security settings, and you can open it in the future by double-clicking it just as you can any registered app
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In the following window below, click on Install to have Java JRE installed on your device. As you can see from the license terms, only personal usage is permitted.

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Your permission is required to have Java installed. Enter your password and click on OK as shown below.

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As you can see, Java JRE is currently being installed.

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We have successfully installed Java on our device. You can click on close to terminate the window.

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After the Java installation is complete, you may need to reload (Command+R) or exit (Command+Q) your browser to enable Java in your browser.
– Now the software is installed, you can delete the .dmg file if you want to save disk space

Determining the JRE Version Installed on macOS

The JRE version installed on the system can be determined in one of two ways. First, I will be showing you how this can be achieved via the Terminal.

% /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version
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You can determine which version of the JRE by entering java -version in a Terminal window

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From System Preferences, and then the Other section, click the Java icon as shown below.

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This will start the Java Control Panel. You then click About to display the version information. You are being told that the control panel will open in a separate window.

The Control Panel allows you to find information about Java version and configure various settings to help you efficiently run Java on your Mac.

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As you can see, on the General tab, you can see other settings.
Network Settings: By default, Java will use the network settings in your web browser. You can set preferences including proxy servers in this setting.
Temporary Internet Files: Files used in Java applications are stored in a special folder, called a cache, for quick execution later. You can view and configure cache files, settings, including file location, as well as delete cache from this setting.

To ensure your systems checks for Java updates automatically, ensure the following button below is checked. On the Java tab, you could view and manage Java Runtime versions and settings for Java applications and applets.

Keep your software up to date. If you need Java, download the latest version of Java for OS X directly from Oracle.

On the Security tab, you can set the security level from within the Java Control Panel so that you are notified before any untrusted Java applications will be run, or the application will automatically be blocked

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On the advanced tab, you have got lots of settings as shown below. Kindly go through them and enable or disable them as your wish.

- Debugging: Allows you to enable tracing, logging and show applet lifecyle exceptions.
- Java console: Allows you to show hide or disable the Java console
Shortcut Creation: Allows you to allow apps or the user to create or disable shortcut creation.
- JNLP File/MIME Associations: Allows, disables or prompts user for file associations.
- Application Installation: You can enable or disable app installations in this setting.
- Security: Allows you to configure various settings related to security such as grant permissions to content, alert users about site certificates, enable trusted publishers and blacklist revocation checks, use specific SSL and TLS versions, as well as configure mixed code security verification settings.
- Miscellaneous: You can configure whether to place a Java icon in the system tray under this setting

Uninstall JRE on macOS

To uninstall the JRE on macOS, you must have Administrator’s privileges. Since I do not wish to uninstall Java JRE at this time, I will just be showing you the steps.

  1. Click on the Finder icon located in your dock
  2. Click on the Utilities folder
  3. Double-click on the Terminal icon
  4. In the Terminal window Copy and Paste the commands below:
sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane
sudo rm -fr ~/Library/Application\ Support/Oracle/Java

Do not uninstall Java by removing the Java tools from /usr/bin. This directory is part of the system software and any changes will be reset by Apple the next time that you perform an update of the OS.

Remove Oracle Java cache on Mac

  1. Click on the Finder icon located in your dock
  2. Click on Go in the Finder menu
  3. Click on Utilities
  4. Double-click on the Terminal icon
  5. In the Terminal window Copy and Paste the commands below:
rm -r ~/"Library/Application Support/Oracle/Java"

I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.

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