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If you download the .tar.gz for OpenJDK 11 directly from http://jdk.java.net/11/, there’s no obvious installation instructions (at least that I could find) on the OpenJDK website or in the .gz file. If you’ve done any fiddling with different JDK versions on MacOS before, you’ve probably come across the ‘/usr/libexec/java_home’ utility, which composes a number of useful things relating to the JDK that you’re currently using in your PATH. Click here for my previous article about this utility and answers to this StackOverflow post, which includes one of the most extensive and useful guides to running different JDK versions on MacOS that I’ve seen.

/usr/libexec/java_home: This will show you where the current JDK home is, for example:

OpenJDK support for Java 7 on Mac OS X; On-time release of Java 7 for Mac OS X; Update - January 10th, 2010. The official Mac OS X OpenJDK7 project has been established! SoyLatte is a functional, X11-based port of the FreeBSD Java 1.6 patchset to Mac OS X Intel machines. SoyLatte is initially focused on supporting Java 6. Java SE 7 Archive Downloads. Go to the Oracle Java Archive page. Thank you for downloading this release of the Java TM Platform, Standard Edition Development Kit (JDK TM).The JDK is a development environment for building applications, applets, and components using the Java programming language. This document instructs you on how to set up a Java programming environment for your Mac OS X computer. It also provides a step-by-step guide for creating and compiling a Java program in IntelliJ and executing it from the command line. You will need a Mac running Mac OS X 10.13 (High Sierra) to Mac OS X 10.15 (Catalina). Tested and verified for MS Windows 7/8/10, Linux and Mac OS X. Windows and MacOS installers include OpenJDK 11 bundle. If you are on Mac OS X and you do NOT use PKG installer then you will need to setup Java. If you need 32-bit version of DBeaver then you can download version 6.0.0 or earlier. Early Access: You may get latest build (EA. In this article, I will be using Homebrew to install OpenJDK versions on the Mac. We use brew install to install JDK versions 8,9,10, and brew cask install for version 11 and above.

/usr/libexec/java_home -V: This lists all installed JDKs, which is shown below:

To switch between JDKs, use /usr/libexec/java_home -v version (e.g. 10):

Knowing that your available JDKs are installed to /Library/Java/JavaVirtualMachines/ by default, moving the contents of the downloaded OpenJDK 11 dir from inside the .gz file to the same location would make sense.

Once you’ve moved it there, java_home -V now shows the new JDK in place:

Updating my aliases to quickly switch versions in my .bash_profile, I now have:

Sourcing the .bash_profile (source .bash_profile) and then running each alias, now I’ve got OpenJDK 11 set up and ready to go!

Published at DZone with permission of Kevin Hooke, DZone MVB. See the original article here.

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NetBeans IDE 7.0 has support for the bleeding edge OpenJDK 7.0 build release. Even if Mac OS X does not have an official binary distribution on the Open JDK site yet, we can still get a DMG bundle of the latest build of Open JDK7 to test on Mac OS X.
Let us go through steps we need to perform to install and test OpenJDK7 on Mac OS X. The OpenJDK7 latest binary is available on the Google Code site http://code.google.com/p/openjdk-osx-build/

The latest build available there today is seen as b144 which is the latest build available on the OpenJDK7 download page also. This bundle is available in 32 as well as 64 bit version.
They have created a nice DMG bundle which shows the Java mascot when we open the DMG.

The installation starts as a usual Mac OS X installer bundle. As seen from the below image this version takes 179.6 MB on disk.
Once we have installed the OpenJDK7 latest binary build. We can start the Java Preferences application from the Spotlight and can see two more JDK instances available in the list of JDK available. One for 32 bit and one for 64 bit.
If we choose we can set the JDK7 version default here. I choose not to set it as default yet as it is not an official version from OpenJDK7 site. We can still use this JDK from NetBeans by registering it as a JDK platform.

For registering the JDK7 as platform on NetBeans IDE 7.0 open up the Java Platform Manager from Tools > Java Platforms menu. The new JDK7 will not be seen yet. We will have to press the Add Platform button.
NetBeans IDE will point you to correct Java Library directory from where you can choose the openjdk-1.7 instance of the java platform.

When we select the openjdk-1.7 folder NetBeans IDE correctly fills all the required information and presents a prefilled dialog boz for Add Java Platform and we just have to click Next.
JDK 1.7 will start appearing in the available Java Platforms list. As we can see NetBeans detects all the required files and documents required for registering the JDK 1.7 platform.

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Now we can start any Java project and set the Java Platform as JDK 1.7. For that we will have to open the Project Customizer by right clicking the project and choosing the Properties menu.
We need to change the Java Platform entry in the Libraries node first.
Once the Java Platform is set as JDK 1.7 in the Libraries Node it becomes available in the Sources Node also in the Source/Binary Format combo box. We will have to set this as JDK 7 also.

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Now this project is set to be compiled and run under Java 7 platform. We can test this by adding some generics statement and NetBeans IDE offers a hint to use diamond operator (Project Coin)
NetBeans IDE will also apply those changes to the code when we select the hint as seen in the image below.

So this is how we can install latest JDK 1.7 on our Mac machines and test the JDK 7 version from NetBeans IDE 7.0 which supports JDK 1.7 features now.

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with regards
Tushar Joshi, Nagpur