Download Eclipse Java On Mac



In CS106A, we'll be using Stanford's customized version of Eclipse to build our programs. Eclipse is an enormously popular industrial-strength Java environment with many features. Fortunately, Eclipse is also open source -- anyone is free to change Eclipse to work the way they want. We have taken advantage of that freedom to install special Stanford features into Eclipse, tailoring it specifically for CS106A. This document gives instructions on how to get started using Stanford Eclipse. Please pay close attention to these instructions and do not skip steps!

Contents

A download of eclipse-java-helios-SR2-macosx-cocoa.tar.gz will start. If you first get a window like this just click 'OK' so that the downloaded file opens with Archive Utility. The download will go to your Downloads folder. Try some of the suggestions here: my eclipse stopped working today especially using terminal to run./eclipse -clean. Other potential solutions are these: When downloading all the Eclipse/Java parts, be sure to save and unpack to an HFS+ partition. Install Eclipse IDE for Mac / Macintosh / Java Commands: cd = change directory (cd Documents/Downloads/) ls = list files in that directory tar -xvf NAMEOFFILE = untar/unzip the file.

  1. So, I go to the Oracle website and download the latest version of java. The warning keeps on appearing when I try to re download the Eclipse IDE. When I check java -version on Terminal, the version is still shown as 1.6 (the old java version). I am using a MacBook version 10.12.13 and using macOS Sierra. I am trying to download Eclipse Neon.
  2. Download Eclipse IDE for Java EE Developers for Mac & read reviews. Create Java web applications easily.
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Installing Eclipse on a Mac

Stanford Eclipse will only work on Mac OS X version 10.6 or higher. If you don't have that version of the operating system, you'll need to either upgrade or do your class work in a public cluster.

  1. Download and install the Java SDK installer for Mac
  2. Download the Mac version of Eclipse
  3. Double-click on the file eclipse-mac.dmg to open the Eclipse disk image(You can delete eclipse-mac.dmg afterwards).
  4. Drag the Eclipse app into the Applications folder on your Mac.
  5. Drag the Eclipse icon from your Applications folder to your Dock to create a shortcut.
  6. Click on the icon in the dock to open Eclipse. If you see an error that says Eclipse 'can't be opened because it is from an unidentified developer,' right-click on the Eclipse icon and select 'open' instead. You will be able to open Eclipse without right-clicking from now on.
  7. Skip to the instructions below to configure Eclipse for CS106A.

Installing Eclipse in Windows

Our version of Eclipse will run on Windows 7 (2009) or higher. In the very unlikely event you have an older version of Windows on your computer, you will need to either upgrade or do your class work in one of the public computer clusters. You can check your version of Windows using these instructions.

  1. Uninstall previous versions of the Java Runtime Environment (JRE). Before installing a new version of the JRE, we recommend that you remove any older copies that may be installed on your system.
    • If you have Windows 7 or 8, do the following: Click on Start, then click on Control Panel, then select Programs and Features.

      If you have Windows 10, do the following: Click on Start (the Windows icon in the lower left-hand corner), then click on Settings (the gear-shaped icon), then select Apps & Features.

    • From the list of programs you see, uninstall any occurrences of Java/J2SE Runtime Environment, Java SDK, Java SE Development Kit or Java Update. Note that the exact program name may be slightly different or include a version number, but you generally want to remove anything that includes the text: Java/J2SE Runtime Environment, Java SDK, Java SE Development Kit or Java Update. To remove a program, click on the program name to highlight it and click the the Uninstall button.
  2. Download Eclipse.
    Save the downloaded file to somewhere on your hard drive. This may take a little while as the file is rather large.
  3. Unzip/extract the contents of the file by right-clicking on the folder you just downloaded, selecting the Extract All... option and typing C:Program Files as the location to extract the files to. Then continue following the steps in the extraction process.
  4. Create a shortcut to Eclipse on your Desktop for easy access — Open the C:Program Fileseclipse directory, and right-click and drag the eclipse.exe file (the Eclipse application) to your desktop and then select the option Create shortcut here.

    5. Note: If you installed the 64 bit versions of the software, and find that you have issues running Eclipse, we recommend that you uninstall Eclipse by deleting the C:Program Fileseclipse directory and install the 32 bit versions of both: the JRE 32 bit version for Windows and Eclipse 32 bit version for Windows, in that order.

  5. Continue to the instructions below to configure Eclipse for CS106A.

Configuring Eclipse for CS106A (both Mac and Windows)

Once you have Eclipse installed on your computer, there are a few CS106A-specific changes you need to make so that you can access some special Stanford features, like submitting assignments. The following instructions apply to all operating systems, although the screenshots are from a Mac.

  1. Open Eclipse if you haven't already. When you run Eclipse for the first time, you may get a screen that looks like this:
    A workspace is just a directory that Eclipse will use to place new projects in. In 106A you won't have to make any new projects from scratch. We will always give you skeleton projects for your assignments, so you don't need to worry about where the workspace is. The suggested location is fine. Click the Use this as the default and do not ask again checkbox, and then click OK.
  2. Once Eclipse has started, you can close the 'Welcome' tab using the 'X' in the top left.
  3. Click Help -> Install New Software.
  4. In the 'Work with' text box, type https://web.stanford.edu/dept/cs_edu/eclipse/plugin and press Enter.
  5. Click 'Select All,' then click Next.
  6. Click Next again.
  7. Click 'I accept the terms of the license agreement,' then click Finish.
  8. Click OK when you see the warning about installing unsigned content.
  9. Click Yes when asked to restart Eclipse.
  10. After restarting, you should see a 'Stanford Menu' in the top bar, as well as several new icons in your top toolbar area.
  11. Go to Eclipse -> Preferences to open the Preferences window. In the dropdowns on the left, expand Run/Debug, and click Perspectives. Set 'Open the associated perspective when an application suspends' to Never, as shown below, and click Apply and Close.
  12. Now that you have Eclipse loaded and configured, your next step is to add a project to your workspace by importing a skeletal framework that we provide with each assignment called a starter project. Using starter projects makes your life much easier by allowing you to ignore the many details involved in creating a project from scratch. Every assignment will include a starter project for each problem, and your first task for each assignment will be to download the starter project from the class website and then import it into your workspace. The details for doing so are described in the handout 'Using Karel with Eclipse'.

Having trouble with your installation?

Check out this doc for common Eclipse errors and issues / Troubleshooting, email the Head TA or stop by their Office Hours, or stop by the LaIR. During the first week, you can also stop by the Eclipse Setup Session on Wednesday 4/4/18 7-9 PM in the LaIR (first floor of Tresidder).

Troubleshooting

  • Q: Eclipse is showing an error in the Console 'Could not save C++ lib configuration file.' Do I need to worry about this?
    A: No. This error should not affect the running of your programs, and you can ignore it.

  • Q: Help! I don't see the 'running person', submit, import, etc. icons or the 'Stanford Menu' in my Eclipse.
    A: This means the Stanford Plugin is not installed; please repeat the steps under 'Installing the CS106A plugin' above.

  • Q: My Eclipse window doesn't look like the ones in the screenshots or in lecture. I'm missing some of the panels (e.g. the sidebar showing all my projects). Help!
    A: Click the 'Reset' button in the Stanford Menu to reset to the default view. You may also be in Debugger mode instead of Editor mode; use the Stanford Menu to go back to Editor mode.

  • Q: Eclipse is not letting me import a project. It gives me a warning at the top of the import window that 'Some projects cannot be imported'.
    A: This is because a project with that name is already imported into Eclipse. If you would like to import this project, you must first delete the existing project by right-clicking the project in the sidebar and selecting 'Delete'. You can then choose whether to delete the project from your computer as well, or just delete the project from Eclipse.

  • Q: When I run a Karel program, it immediately crashes with an 'Unsupported Version Error'.
    A: This means Eclipse is using Java 9, which is not compatible with running your programs. See the solution to the following question about being unable to run programs.
  • Q: When I click the running person icon to run programs, Eclipse gives me an error that it 'could not find any programs to run', even though I have a project imported with programs.
    A: This means Eclipse is using Java 9, which is not compatible with running your programs. To change Eclipse to use Java 8 instead, follow these steps:
    1. Open Eclipse Preferences: On Mac: in the top toolbar, go to Eclipse -> Preferences. On Windows: in the top toolbar, go to Window -> Preferences.
    2. Change JRE version to 8: In the sidebar of the preferences window, expand the 'Java' section. Click on 'Installed JREs'. If the checked option is a version of Java SE 9, instead check the box next to Java SE 8 [1.8.0_152]. Click 'Apply' in the bottom right.
    3. Change Compiler version to 1.8: In the sidebar of the preferences window, click on 'Compiler'. If the 'Compiler compliance level' is 9, change it to 1.8. Click 'Apply' in the bottom right.
    4. Close the preferences window. You should be good to go!


This DrJava-based Java programming environment is no longer being supported(because DrJava in no longer being actively developed and DrJava is incompatible with Java 11).It has been replaced by the following IntelliJ-based programming environment forMac OS X.

This document instructs you on how to set up our Java programming environment for your Mac OS X computer. It also provides a step-by-step guide for creating, compiling, and executing a Java program using either DrJava or the Terminal.All of the software used is freely available.

You will need an Intel-based Mac runningMac OS X 10.8 (Mountain Lion) to Mac OS X 10.13 (High Sierra).

You can defer steps 4–6 until Section 1.5 of the textbook.


0. Install the Programming Environment


Our installer downloads, installs, and configures the Java programming environment you will be using, including DrJava, and the standard libraries from our textbook.

  • Log in to the user account in which you will be programming.Your account must have Administrator privileges (with a non-blank password)and you must be connected to the Internet.
  • Install Oracle's implementation of the Java Platform, Standard Edition Development Kit (JDK 8).Do not install either JDK 9 or JDK 10, as they are currently incompatible with DrJava.
    • Browse toJava SE Development Kit 8u171.In the first table, check Accept License Agreementand the click jdk-8u171-macosx-x64.dmg,which corresponds to the entry for Mac OS X.The exact verison 8u171 is not essential.
    • Double click the downloaded file jdk-8u171-macosx-x64.dmg to begin the installation.Enter your OS X password when prompted.We recommend all of the default options.
    • Delete jdk-8u171-macosx-x64.dmg.
  • To install,
    • Download introcs.zip to the Desktop;double-click it to unzip (if necessary). This creates introcs.app. Security and Privacy -> General -> Allow applications downloaded from: Anywhere.

      To enable this option, you may need to click the lock in the lower left-hand corner(and type your password when prompted).-->

    • Double-click introcs.app to perform the installation.If you receive a warning that introcs.app is an applicationdownloaded from the Internet, click Open.
    • Enter your OS X password when prompted.
  • If the installation succeeds, you will see the following:
    • A Terminal window containing approximately thisexecution log.
    • A Standard Drawing window containing a red bullseye and a textbook graphic.
  • Delete introcs.zip and introcs.app.

1. Create the Program in DrJava


Now you are ready to write your first Java program.You will develop your Java programs in an application called DrJava.DrJava features many specialized programming tools including syntax highlighting,bracket matching, auto indenting, and line numbering.

  • The installer creates a shortcut to DrJava on the desktop.Double-click it to launch DrJava.If you receive a warning about incoming network connections,click Allow.
  • In the main DrJava window, type the Java programHelloWorld.java exactly as it appears below. If you omit even a semicolon, the program won't work. As you type, DrJava does the indenting for you.
  • Finally, click the Save button to save the file, using the name HelloWorld.java.The filename is case sensitive and must exactly match the name of theclass in the Java program.

2. Compile the Program in DrJava


It is now time to convert your Java program into a form more amenable for execution on a computer. To do this, click the Compile button.If all goes well, you should see the following message in the Compiler Outputpane at the bottom:

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If DrJava complains in some way, you mistyped something.Check your program carefully, using the error messages in the Compiler Output paneas a guide.


3. Execute the Program in DrJava


Now it is time to run your program. This is the fun part.

  • Type the following in the Interactions pane at the bottom.By convention, we highlight the text you type in boldface. If all goes well, you should see the following message:
  • You may need to repeat this edit–compile–execute cycle a few times before it works. Ask for help if you can't see the mistake.
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4. Command-Line Interface with the Terminal

Download Eclipse Java On Mac Version


The command-line provides capabilities beyond those available in DrJava,including redirection and piping.You will type commands in an application called the Terminal.

  • The installer creates a shortcut on the desktop to the Terminal.Double-click it to launch the Terminal.You should see something like:The ~ is shorthand for your home directory /Users/<username>.
  • To confirm that the Java compiler is installed,type the command in boldface below and check that the results match:It's important that you see the number 1.8for the Java version number, but the rest is not critical.
  • To confirm that you the Java interpreter is installed, typethe command in boldface below and check that the results match:Again, it's important that you see the number 1.8for the Java version number, but the rest is not critical.

5. Compile the Program from the Terminal


You will use the javac command to convert your Java program into a form more amenable for execution on a computer.

  • From the Terminal, navigate to the directory containing HelloWorld.java,say ~/Desktop/hello,by typing the cd (change directory) commands below:The ~ is shorthand for /Users/<username>.
  • Compile it by typing the javac command below:Assuming the file HelloWorld.java is in the current working directory,you should see no error messages.
  • To make our textbook standard libraries accessible to Java,use the command javac-introcs instead.For example,BouncingBall.javais a program that uses our standard drawing library.After downloading the file to the current directory,you can compile it with the following command:

6. Execute the Program from the Terminal


You will use the java command to execute your program.

  • From the Terminal, type the java command below.You should see the output of the program.
  • To make our textbook standard libraries accessible to Java,use the command java-introcs instead. For example, to executeBouncingBall.java(assuming you downloaded and compiled it in the previous step), type the following command:

Troubleshooting


How long should the installer take?Once downloaded, the Oracle Java installer should take about 10 seconds and the introcs.app installer should take about 20 seconds. If you have virus detection software running (such as McAfee Endpoint), each could take 5–10 minutes (or more).

The installer didn't work on my machine. What should I do?Check out the following three Q+As. If these don't resolve the issue,please contact a staff member to identify what went wrong.

When I run the installer, the terminal window just waits after asking for a password.But, I don't even have a password-enabled account.You must have a non-blank password. Here are instructions forresetting a user's password.

When I run the installer, I get the error message'bash: /Volumes/Macintosh: No such file or directory'.Your user account and OS must be on the same volume.

When I run the installer, I get an error like bash: /private/var/folders/70/n8stth1d1x33hrw8n07kf1280000gn/T/AppTranslocation/45FC25B7-17E3-46DF-AC27-9A7EF56DDFD3/d/algs4.app/Contents/Resources/launcher.sh: No such file or directory.What should I do? This is likely due to OS X Sierra path randomization.Use the Finder to move introcs.app to some other folder and try again.

What does the installer do?In short, it downloads, installs, and configures Checkstyle, Findbugs, and DrJava, and the textbook standard libraries.Here is a more detailed list:

  1. Checks that Java is installed.
  2. Downloads the textbook standard libraries fromstdlib.jar.
  3. Downloads the Java wrapper scriptsjavac-introcs andjava-introcs.
  4. Downloads and installsFindbugs 3.0.1from findbugs.zip.Downloads our findbugs configuration file findbugs.xml and wrapper script findbugs-introcs.
  5. Downloads and installsPMD 5.8.1from pmd.zip.Downloads our PMD configuration file pmd.xmland wrapper script pmd-introcs.
  6. Downloads and installsCheckstyle 8.2from checkstyle.zip.Downloads our checkstyle configuration file checkstyle-introcs.xml and wrapper script checkstyle-introcs.
  7. Downloads and installs the latest stable version ofDrJava,from DrJava.zip.Creates a shortcut to DrJava on the Desktop.Downloads and installs the DrJava configuration file fromdrjava-config.txtto /Users/<username>/.drjava.Note that this will overwrite any existing .drjava configuration file.
  8. Tests that the installation succeeded by compiling and executing TestIntroCS.java.

Why does the installer need my password?The installer copies files into /usr/local/bin and/usr/local/introcs,which require superuser privileges.

How do I completely uninstall introcs.app?

  • Delete the directory /usr/local/introcs.
  • To uninstall DrJava, delete the following two files:
    • /Applications/DrJava.app.
    • /Users/<username>/.drjava.
  • To uninstall the Java, Checkstyle, and Findbugs wrapper scripts,delete the following files:
    • /usr/local/bin/javac-introcs
    • /usr/local/bin/java-introcs
    • /usr/local/bin/findbugs-introcs
    • /usr/local/bin/pmd-introcs
    • /usr/local/bin/checkstyle-introcs
  • Delete the shortcut to DrJava and Terminal on the Desktop.

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What happens if I re-run the installer?It will re-download, install, and configure Checkstyle, Findbugs, DrJava, and our textbook libraries.

Can I use a different version of Java?Any version of Java 8 (either Oracle or OpenJDK) should work fine.Note that DrJava does not currently work with Java 9.

I have both Java 8 and Java 9 installed, but the default version is Java 9. How doI change the default version back to Java 8?To disable Java 9, type the following commands in the Terminal:

You should still be able to use Java 9 by specifying the full path tojavac and java, e.g.,/Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk/Contents/Home/bin/javac.

Why I try to run DrJava, I get the following error message. How should I proceed?

Are you sure that you are using the version of DrJava that was installedby our auto-installer (and not downloaded from the DrJava website)?We suggest deleting any older versions of DrJava and using the one that the auto-installer copied to the /Applications directory.

Can I use a different IDE? Yes you can use another IDE (such as Eclipse) butyou will have to configure the IDE properties yourself (such as the classpath). Reset Interactions.From the Terminal, type Ctrl-c.

When using standard input, how do I signify that there is no more data?If you are typing input in the Terminal or DrJava, type Ctrl-d on its own line.

I successfully compiled HelloWorld.java with javac, but, when I execute,I get the error message'Exception in thread 'main' java.lang.NoClassDefFoundError: HelloWorld'.What am I doing wrong?First, verify that the file HelloWorld.class is in the current directory.Be sure to type java HelloWorld without a trailing .classor .java.-->

When I compile or execute a program in Terminal that uses thetextbook standard library, I get an error that it cannot find the library. How can I fix this?Use the wrapper scripts javac-introcs and java-introcs,which add stdlib.jar to the Java classpath.

Which shell should I use in the Terminal?Bash is the default shell in Mac OS X, but feel free to usewhichever one you prefer.

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Where can I learn more about the command line?Here is a short tutorial on thecommand line.

Last modified on August 14, 2019.
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