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This page tells you how to download and install Java 8 and Eclipse on Mac OS X, and how to configure Eclipse.

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Installing Java 8

  1. Go to the Oracle website. You'll see something like this:

  2. Scroll down until you see a heading beginning 'Java SE 8u65/8u66.' On the right, you'll see a Download button under the JDK header. Click it. The next screen will look like this:

    Click the radio button next to 'Accept License Agreement' and then click on jdk-8u65-macosx-x64.dmg. You'll be asked whether to save the file that is going to be downloaded; click on Save File.

  3. Open your Downloads folder, and double-click on jdk-8u65-macosx-x64.dmg. You'll see this window:

  4. Double-click on the package icon, and follow the instructions to install. When the installation has completed, click on Done. At this point, you may close up the window and drag jdk-8u65-macosx-x64.dmg to the Trash.


Installing Eclipse

  1. If you already have Eclipse installed on your Mac, you need to get rid of it. To do so, first quit Eclipse if you're currently running it. Then, go to your workspace folder (probably in Documents/workspace) and save anything there that you want to keep, because you're about to get rid of this folder. Next, drag the workspace folder to the Trash.

    Go to your Applications folder. One way to get there is, from the Finder, type command-shift-A. You'll a folder named eclipse in there; drag the eclipse folder to the Trash. If you have an Eclipse icon in your dock, remove it from the dock.

  2. Now you're ready to download and install the newest version of Eclipse. Go to this website. You'll see a window like this:

    Scroll down until you see 'Eclipse IDE for Java Developers' and click where it says 64 bit under Mac OS X.

  3. You will see this window:

    Click on the yellow download button. If asked, click on 'Open with Archive Utility (default)' and then click OK. The download might take a few minutes. You should not feel compelled to donate.

  4. After the download completes, folders should automatically expand. If they don't, double-click on the .tar file. When that's done, you should see a folder named eclipse in your Downloads folder. When you open your Downloads folder, if you see Applications under the Favorites on the left side of the window, you should drag the eclipse folder into Applications. If you don't see Applications, then open a new window for Applications (from the Finder, command-shift-A), and drag the eclipse folder into Applications.

  5. Open your Applications folder, and then open the eclipse folder. You'll see an item named Eclipse; if you like, drag its icon into the dock so that you'll be able to launch Eclipse easily.

  6. Launch Eclipse. If you're asked whether you want to open it, of course you do; click Open. You'll see a window like this:

    It will have your user name rather than mine (scot). Select where you want your workspace to be; I recommend the default of your Documents folder. Click the checkbox for using this location as the default, and then click OK.

  7. You'll see a window like this:

    Click on the Workbench arrow in the upper right that I've circled. You shouldn't see this screen again, even if you quit Eclipse and relaunch it.

  8. You'll get an empty workbench like this:

    We won't be using the 'Task List' and 'Connect Mylyn' windows. Click the 'x' on each to close it. Press the mouse on the Window menu item, then choose 'Perspective', and finally choose 'Save Perspective as..'. Enter 'cs10' for the name of this perspective and press return. Your workbench will now look like this:

    You have now installed Eclipse!

Configuring Eclipse

You don't have to configure Eclipse the way I do, but you'll probably avoid some confusion if you do. Here's how.

  1. In the Eclipse menu bar, click on the Eclipse menu and then on 'Preferences..'. You'll see a window with two panes. On the left pane is a list of types of things you can configure.

  2. Click on the triangle to the left of General. Then click on the triangle to the left of Appearance. Then click on 'Colors and Fonts.' You should see a window like this:

  3. In the window in the middle, click on the triangle next to Java. Then double-click on 'Java Editor Text Font':

  4. You'll see this window:

    On the right, where you can select the size, click 12. Then close this window by clicking on the window's close button.

  5. Close up the General preferences by clicking on the triangle to the left of General. Click the triangle next to Java and then click the triangle next to 'Code Style.' Then click Formatter. Here's what you should see:

  6. Click the button that says 'New..'. You'll see a window such as this one:

    You can type in any profile name you like. I used 'CS 10':

    Click OK.

  7. You should see a window like this:

    Change the tab size to 2:

    You'll see that the indentation size automatically changes as well.

  8. Click on 'Blank Lines,' and after 'Between import groups' and 'Before declarations of the same kind,' change the values 1 to 0:

  9. Click on 'Control Statements,' and check the first four boxes as I've done here:

    Click OK.

  10. Now click on triangles to close up Java. Click on the triangle next to Run/Debug, and then click on Console:

  11. Click on the green color sample next to 'Standard In text color.' You'll get a color picker:

  12. Slide the slider on the right down, so that you get a dark green. (You're at Dartmouth. What other color could you possibly want?)

    Close the color picker window by clicking its close button, and click OK again to close the Preferences window.

  13. And you're done!

In this article, see how to manage multiple JDKs on Mac OS, Linux and Windows WSL2.

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If you, like me, have to deal with multiple projects at different stages, like one being legacy, another one being the latest, and another one being a library or tool consumed by users also using different versions of Java, then you have a small Multiple JDK problem, assuming you only care for one vendor of JDK; otherwise, you have a Matrix JDK problem.

Installing, managing, and switching between JDKs in your computer is no easy task these days where the majority of developers are still on Java 8, while a good chunk is now moving to Java 11. And there are many ways to do that.

This article is to help you through that process.

The Manual Way

You can go after your JDK vendor-of-choice website and download binaries, and install them all manually (or even better just extract them to some folder like $user/jdks and be done with it. But then you have to always verify and update JAVA_HOME to point to the one you really want for this and for that project.

Solutions for this would include using bash scripts, bash functions, and so on. The main problem? You may simply forget to call the script/function, and be hit with some UnsupportedClassVersionError to then only realize what's wrong.

I'll leave this to you to dig the internet for solutions, if you prefer the manual way. For advanced users, it may be the best choice. But I prefer some tooling for this. So, let's dive in:

The Better Way

In my opinion, the ideal way is by combining two open source tools that exist already for quite some time and you may already know at least one of them. What you don't know is that you can combine them.

Let's see how we get them to play ball together…

Install Multiple JDKs

Once you have SDKMAN! installed and configured, you will type:

Once you find the vendor and version you want to install, you will type:


Let’s add four JDKs, two recent versions of Oracle OpenJDK and two LTS versions by AdoptOpenJDK.

Whenever asked by SDKMAN!, do not set any of them as the default.

  1. AdoptOpenJDK build of OpenJDK 8u252 — LTS
  2. AdoptOpenJDK build of OpenJDK 11.0.7 — LTS
  3. Oracle OpenJDK 14 — Latest GA
  4. Oracle OpenJDK 15 — Early Access Builds of next release

These four versions should cover you well for legacy projects still stick to Java 8, but also put you in a nice place for modern projects with Java 11 as well as the possibility to experiment new features and enhancements on Java 14 and Java 15.

Alright, you’ve got 4 JDKs installed locally with SDKMAN! —I think this tool is really great for this use case, and I hope you enjoyed it too.

All JDKs installed can be found inside the following directory:

Now, if you do want to just use one JDK at all times and not have to switch back and forth, you can use SDKMAN! to set your JDK of choice:

You can stop here and just use SDKMAN! but you will eventually forget to switch back based on the project you are working on, just like by using some manual shell script. And because of this, I prefer to auto-switch.

Manage Multiple JDKs With jEnv

While SDKMAN! can install and manage JDKs, the tool doesn't do a great job at auto-switching between versions for you automatically as you move from project A to project B.

For that, you will want jEnv.

Once you have it installed and configured, and multiple JDKs, whether with SDKMAN! or some other way, you will need to add those JDKs to jEnv. Here’s how:

Repeat the command jenv add for all other 3 versions.

jEnv has excellent features especially for those constantly using terminals. It will allow you to:

  1. Set a Java version for your overall system.
  2. Set a Java version for the current directory/project you are in.
  3. Set a Java version for the current shell.

jEnv uses shim binaries and also manipulates the JAVA_HOME environment variable for you automatically. So, once you have these settings, jEnv will switch to whatever version makes most sense, based on the priority above and based on where you are. Neat! It has other nice features, so check the website for more documentation.

Auto-Switch Between Multiple JDKs

Now you have Java 8, 11, 14 and 15-EA available. So how do you switch back and forth? Let's set versions and switch back and forth.

First you set a Java version to be global default. I like to use an Early Access as my system default. Whenever I hit a new project, I will automatically attempt to work with an upcoming release, and this could help me identify potential problems I can then report back to the OpenJDK project. But you do you…

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With this setting, whenever you hit any folder on your terminal and you type java -version you will get OpenJDK 15 EA.

If you do have a project that must use Java 8, then you navigate to that project folder, and you type:

This will create a file called .java-version with the following content:

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This file is what tells jEnv which JDK to use for when the terminal is on this folder.

Finally, if you are on some location and you want to temporarily switch to a specific JDK version, then you use jenv shell.

Here's a demonstration that can explain better all these concepts and how the Auto-Switch works.

I hope you enjoyed the read, and if you have questions, just reach out to me on Twitter.

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