Java Tools For Mac

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This answer is an attempt to address: how to control java version system-wide (not just in currently running shell) when several versions of JDK are installed for development purposes on macOS El Capitan or newer (Sierra, High Sierra, Mojave).As far as I can tell, none of the current answers do that (.). As a developer, I use several JDKs, and I want to switch from one to the other easily. REDWOOD SHORES and CUPERTINO, California—November 12, 2010—Oracle and Apple® today announced the OpenJDK project for Mac OS® X. Apple will contribute most of the key components, tools and technology required for a Java SE 7 implementation on Mac OS X, including a 32-bit and 64-bit HotSpot-based Java virtual machine, class libraries, a. Java developer tools for Mac now available. By Dennis Sellers, MacCentral.com. MacCentral Version 2.5 of SQL4X Manager, the graphical interface for Web and database developers to access any Java. The Version table provides details related to the release that this issue/RFE will be addressed. Unresolved: Release in which this issue/RFE will be addressed. Resolved: Release in which this issue/RFE has been resolved. Fixed: Release in which this issue/RFE has been fixed.The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

This topic includes the following sections:

System Requirements for Installing the JDK on macOS

The following are the system requirements for installing the JDK on macOS:

Java Tools For Mac
  • Any Intel-based computer running macOS.

  • Administrator privileges.

    You cannot install Java for a single user. Installing the JDK on macOS is performed on a systemwide basis for all users. Administrator privileges are required to install the JDK on macOS.

Determining the Default JDK Version on macOS

When starting a Java application through the command line, the system uses the default JDK.

There can be multiple JDKs installed on the macOS system.

You can determine which version of the JDK is the default by entering java -version in a Terminal window. If the installed version is 13 Interim 0, Update 0, and Patch 0, then you see a string that includes the text 13. For example:

To run a different version of Java, either specify the full path, or use the java_home tool. For example:

$ /usr/libexec/java_home -v 13 --exec javac -version

Installing the JDK on macOS

  1. Download the JDK .dmg file, jdk-13.interim.update.patch_osx-x64_bin.dmg.

    Before the file can be downloaded, you must accept the license agreement.

  2. From either the browser Downloads window or from the file browser, double-click the .dmg file to start it.
    A Finder window appears that contains an icon of an open box and the name of the .pkg file.
  3. Double-click the JDK 13.pkg icon to start the installation application.
    The installation application displays the Introduction window.
  4. Click Continue.
  5. Click Install.
    A window appears that displays the message: Installer is trying to install new software. Enter your password to allow this.
  6. Enter the Administrator user name and password and click Install Software.
    The software is installed and a confirmation window is displayed.
After the software is installed, you can delete the .dmg file if you want to save disk space.

Uninstalling the JDK on macOS

You must have Administrator privileges.

Note:

Do not attempt to 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.

  1. Go to /Library/Java/JavaVirtualMachines.
  2. Remove the directory whose name matches the following format by executing the rm command as a root user or by using the sudo tool:
    /Library/Java/JavaVirtualMachines/jdk-13.interim.update.patch.jdk

    For example, to uninstall 13 Interim 0 Update 0 Patch 0:

    $ rm -rf jdk-13.jdk

Installation FAQ on macOS Platform

This topic provides answers for the following frequently asked questions about installing JDK on macOS computers.

1. How do I find out which version of Java is the system default?

When you run a Java application from the command line, it uses the default JDK. If you do not develop Java applications, then you do not need to worry about this. See Determining the Default JDK Version on macOS.

2. How do I uninstall Java?

See Uninstalling the JDK on macOS.

3. After installing Java for macOS 2012-006, can I continue to use Apple's Java 6 alongside the macOS JDK for Java 13?

If you want to continue to develop with Java 6 using command-line, then you can modify the startup script for your favorite command environment. For bash, use this:

$ export JAVA_HOME=`/usr/libexec/java_home -v 13`

Some applications use /usr/bin/java to call Java. After installing Java for macOS 2012-006, /usr/bin/java will find the newest JDK installed, and will use that for all of the Java-related command-line tools in /usr/bin. You may need to modify those applications to find Java 6, or contact the developer for a newer version of the application.

4. What happened to the Java Preferences app in Application Utilities?

The Java Preferences app was part of the Apple Java installation and is not used by Oracle Java. Therefore, macOS releases from Apple that do not include Apple Java will not include Java Preferences.

Introduction

This guide explains how to install OR-Tools for Java on MacOS.

Although these instructions might also work on other MacOS variants, we have only tested them on machines meeting the following requirements:

  • MacOS 10.15.5 (Catalina) 64-bit (x86_64)
Note: OR-Tools only supports the x86_64 (also known as amd64) architecture.

Xcode Command Line Tools

You must install the Xcode Command Line Tools. To do so, open the Terminal, found in /Applications/Utilities/, and enter:

Click “Install” to download and install Xcode Command Line Tools. You don’t need to 'Get Xcode' from the App Store. If you have a slow Internet connection, it may take many minutes.

Verify that you’ve successfully installed Xcode Command Line Tools:

You should see:

Prerequisite: Java JDK

You must install the Java JDK 7.0 or higher. We recommend installing it using the 'missing package manager for macOS' aka Homebrew:

Once you have installed Homebrew, you can install Java JDK using:

Installing OR-Tools

Take the following steps to install the OR-Tools library for Java:

Download and extract the binary distribution for your system:

FlatZinc binary distributions

Java Tools For Mac Versions

FlatZinc is a solver input language understood by a wide range of solvers.
OR-Tools also provides binary distributions with FlatZinc support:

Validate your installation

Download Dr Java For Mac

To test your Java installations, open a terminal window and navigate to the directory where you unpacked the binary distribution. Then enter the following command:

This runs a selection of examples for OR-Tools. If all the examples run successfully, you are ready to get started with OR-Tools.