How To Download Java On Mac

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Feb 20, 2019  How to Download and Install Java JDK on Mac OS X – 2019 Do you want to know how to install the Java JDK 11 (Java SE Development Kit) on your Mac? Well, you're in the right place! The best approach to install Java on the Mac is to get the latest version of Java JRE directly from Oracle. This is fairly straight forward and you can either initiate the process from the terminal application in macOS or by going directly to the Java download page on Oracles website. Open the Terminal app and type the following: java.

Download and open Minecraft.msi to run the game installer. Then just follow the instructions in the installer. You'll need an internet connection the first time you launch the game, but after that you can play offline without any issues.

An error “you need to install the legacy Java SE 6 runtime”, is encountered when you open any Adobe application.

With Mac OS 10.7 (Lion) and later, the Java runtime is no longer installed automatically as part of the OS installation. Follow any of the methods below to install Java runtime.

You can download and install the latest Java runtime from the Java website - Download Free Java Software.

In this tutorial, we will learn how to install eclipse IDE on Mac OS X. Eclipse IDE (Integrated development environment) is written in Java and mostly used for developing Java applications. In Eclipse IDE, you can write, compile and run your Java code. Download and install Eclipse. Java SE 6 for Mac Free Download Full Version in a single fast link. It is an offline installer of complete Java SE 6 for Mac OSX. Java is so pervasive it’s right around a fundamental piece of processing life. More than three billion gadgets use it, including obviously PCs.

Note:

On Mac OS 10.10 (Yosemite), when you launch any Adobe product, you might receive a warning 'The Application has been moved and its path has been changed..'.

Click Repair Now or Update button to update the location and resolve the issue. When prompted for password, enter your system password to complete.

If Java runtime is not installed, you are prompted to install when you first launch any Adobe product. Follow the onscreen instructions in the Java required notification dialog box to install.

Use the following method to initiate the Java runtime installation or confirm if it is installed.

  1. Go to Applications > Utilities > Java Preferences.

  2. If Java is not installed, you receive the following message: “To open “Java Preferences,' you need a Java runtime. Would you like to install one now?”

  3. Click Install and accept the license agreement. The Java runtime is downloaded and installed.

Many Adobe applications depend on the Oracle Java Runtime Environment (JRE) for some features to work. Apple recently changed the way it includes Java in Mac OS, and with Lion, Java is no longer preinstalled. It is now an optional install that you must select.

Since current Adobe installers and applications were built before these changes by Apple, Adobe software anticipates that Java is installed. Adobe and Apple have worked together to ensure that you can install Java at OS install time. Or it can be installed later before you install Adobe applications. At runtime, when you launch an Adobe application, you are prompted to install Java if it is not already installed. If you do not install Java before running an Adobe application, there can be missing or improperly behaving features. If you encounter any issues, install Java to correct the problems. Adobe recommends that corporate IT organizations pre install Java (or make sure that Java can be installed through their firewalls/security) to avoid conflicts with Adobe applications.

If the Java runtime is not installed, some issues that are known to occur include -

How To Download Java On Mac Os X

  • Failure to launch.
  • Install Java runtime prompts when you attempt to use the applications.
  • Applications hang or quit.

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In the past two articles you have seen how to customize your Java application so that it looks and feels more like a native Macintosh application when running on Mac OS X without changing the end user experience on other platforms. A combination of runtime properties and coding changes that targeted Mac OS X specific APIs made a big difference to that audience.

Recall that Mac OS X is a melding of two worlds. Hard core UNIX programmers can pop open a Terminal window and write their Java code using vi and compile and run it from the command line. There is, however, the more traditional Mac audience that interacts with their computer through a friendly UI that follows Apple Human Interface guidelines.

In this article, we look at deploying your Java application. The technical geek audience might be happy with running a class with a main() method from the command line but the wider audience expects a double-clickable icon that looks and acts like every other native application. In this article, we travel from one end of the spectrum to the other to broaden your potential user base.

Although you should 'test everywhere', your build machine may not be a Mac. Fortunately, as you will see, a double-clickable Macintosh application is just a directory with some special contents and a name that ends with .app. Even on a Windows machine you should be able to modify your build script to package up a Mac-specific version of your application.

Primitive Distributions

Because Mac OS X ships with J2SE 1.4.1 and J2SE 1.3.1, you can distribute your application as class files or jar files and - in theory - your customer could run your application from the Terminal application. We start with these models and quickly move to double-clickable jar files and shell scripts.

For this article, use the Java Sound Demo as the running example. Download and unzip the zip file. Inside the JavaSoundDemo directory you will find the source files inside of the src subdirectory, a jar file, audio files, and html files that we will not use.

Raw Class Files

As a developer, you don't think twice about compiling the source files and running the application using the command line. Compiling the eight files in the src directory generates fifty class files. You can then run the sample application from the command line like this.

java JavaSound

The Java Sound Demo starts up. We haven't customized the application in any way so the menu appears at the top of the JFrame and not where Macintosh users expect. The application looks like this out of the box.

You have done this compile and run step so many times that you hardly think twice about it. Think of the least technical person you know and ask whether they would be likely to follow these steps to run your application if a competing application were easier to install and run.

This example demonstrates two separate areas of usability. Once we got the application up and running it looked good and ran fine. You would not, however, want to distribute an application to an end user this way. You would have to somehow bundle up the fifty class files for easy download and installation. You would then have to provide instructions for running the application using, in the case of Mac OS X, the Terminal application.

Jar Files

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If you are going to have to package up the class files for distribution anyways, you may as well produce a jar file. Gluta dmg for horses. And, if you are going to produce a jar file, it ought to be executable. In the case of the Java Sound Demo, the file JavaSoundDemo.jar is executable. Because Mac OS X ships with the Jar Launcher application, the end user needs only double click on the jar file and the application will launch.

To make the jar file executable, the manifest must include the name of the Main class file. Unjar JavaSoundDemo.jar with the command jar xvj JavaSoundDemo.jar. Here's the file META-INF/MANIFEST.MF.

Shell Scripts and Helper Applications

For larger or more complicated applications you are likely to have more than one jar file along with resource files. A common strategy for targeting multiple platforms is to include a batch file and a shell script. Choose the non-platform specific download from the NetBeans homepage. Inside of the bin subdirectory you will find applications for running NetBeans on a variety of platforms.

The shell script runide.sh can be run from the command line like this.

sh runide.sh -jdkhome /Library/Java/Home

The NetBeans IDE starts up with this decidedly non-Mac OS X look and feel.

You could, of course, modify the shell script to modify this look and feel, but the NetBeans developers decided on a different approach. Even though the typical NetBeans audience member is technically competent, there should be a friendlier way to start the IDE. They have created a native Mac OS X application called NetBeansLauncher.

The version of NetBeansLauncher that is included in the generic NetBeans download is a good next step. You will see how the team took it farther in the next section. On a Mac OS X computer you can double click on the macosx_launcher.dmg file inside of the bin directory. This is a disk image. Drag the NetBeansLauncher from the expanded disk image back into the bin directory. Now double click on the NetBeansLauncher. The ReadMe file that was also in the disk image provides the following information about usage.

When launched for the first time, NetBeansLauncher needs to find NetBeans root directory. First it looks into NetBeansLauncher.app itself. If it does not find NetBeans root directory there user must specify NetBeans root directory manually.

For this download, the first time the user starts up the NetBeansLauncher, they need to navigate to the netbeans directory. After that, double clicking on the NetBeansLauncher starts up the NetBeans IDE as if it were any other native Mac OS X application.

First Class Mac OS X Applications

If you download the Mac OS X disk image from the NetBeans distribution and mount it you may be surprised at the simplicity of what you find. Unlike the complex structure visible in the other distributions, you will see five files with documentation and a single application. To install, you can move this NetBeansLauncher application anywhere on your hard drive. Double click on it and the NetBeans IDE starts right up.

This is the experience that is expected on Mac OS X. The package structure and complexity is hidden from the user and they can't accidentally move a file that renders the IDE unusable. In this section we'll look more closely at the package structure and how to create a Mac OS X application whether or not our build machine is a Mac.

Packages in Mac OS X

Consider again the sentence from the NetBeansLauncher instructions that says in order to locate the NetBeans root directory, 'First it looks into NetBeansLauncher.app itself.' This implies that NetBeansLauncher is a directory with the name 'NetBeansLauncher.app'. In the mounted disk image, either right click or Ctrl-click on the NetBeansLauncher icon and choose to 'Show Package Contents'.

The structure is the same for all Mac OS X applications. There is a Contents directory with an XML file named info.plist, a text file named PkgInfo, a MacOS directory, and a Resources directory. If you don't have a creator code registered with Apple the PkgInfo text file should contain only the following.

If you have a creator code, use it in place of the question marks. Ordinarily the MacOS folder contains a small stub file that launches the Java VM. In this case the NetBeans team has written their own application. We will look more closely at a property list file in the next section. For now, take a look at the contents of the Resources directory.

You can see the contents of the same netbeans package inside of the Resources subdirectory. This is your key to deploying on Mac OS X. Add in the necessary pieces and then just bundle up your ordinary distribution in the appropriate location. If you have a more flexible build process you should also strip out those pieces that aren't needed for the Mac OS X application such as the Windows executables.

If you are interested in digging deeper into the structure of a Mac OS X application, you will find more information in the Apple publication Anatomy of a Bundle.

Creating 'Native' Java Applications on Mac OS X

If you develop on Mac OS X you can use the Jar Bundler application to turn jar files into Mac OS X applications. Jar Bundler is distributed with the other developer tools and is located in Developer/Applications/. Start it, select the 'Classpath and Files' tab and add the file JavaSoundDemo.jar.

Select the 'Build Information' tab. For 'Main Class', navigate to the JavaSoundDemo.jar file again and select JavaSound from the drop down list. This list is populated by any classes in the jar file containing a main() method. Accept all of the default settings for the options. You can use the default Java application icon or you can create your own. The icon you see below started as a screen shot of the running Java Sound Demo and was transformed into an icon using the IconComposer application that is also distributed as part of the developer tools.

Press 'Create Application' and enter the name 'JavaSoundDemo'. A Mac OS X application is created for you. You can show the package contents of the generated application as before. You can view the property list with Apple's Property List Editor or with any text editor. It is just an XML file with properties stored as name - value pairs.

The Java properties indicate the location of the jar file, the name of the Main class, and the version of the JRE to be used. The other properties include a pointer to the icon file and to the Java application stub file that is the native executable.

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Creating Mac OS X Java Applications on Other Platforms

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Take a look at the contents of the package that was generated by Jar Bundler on Mac OS X.

On another platform you need to duplicate this structure. To create an application named 'JavaSoundDemo' on, say, a Windows machine, start by creating a directory and naming it JavaSoundDemo.app. Next, create a subdirectory named Contents. Inside of Contents you will need a MacOS directory with the JavaAPplicationStub. You can create the PkgInfo text file and your Info.plist can also be generated by hand and should contain the following XML.

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You will need a Resources directory with a Java subdirectory into which you put the JavaSoundDemo.jar file. In other words, with the exception of the JavaApplicationStub and the music.icns file, everything else can be created on another platform.

If you use Ant you can easily add a target that takes your jar files, images, and other resources and bundles it up as a Mac OS X application bundle that includes the plist file and Java application stub in the appropriate locations. Every time you create a new build you will automatically have your Mac OS X version. You can also find a growing number of Ant tasks that automate some of the steps outlined in this article.

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Summary

When it comes time to deploy your Java application, consider the ease of use of your target audience. Even developers appreciate the double clickable version of the NetBeans IDE. Creating a Java application that looks and feels like a native application does not require a lot of extra work and can easily be integrated into your build process even if your build machine runs a different operating system.

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