Download Drjava Mac

05-10-2021
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Downloading and setting up DrJava

DrJava is a free environment for writing and running Java programs. It is installed on CIT's computers throughout the campus and in the ACCEL lab.

Please note that there are two versions of Java. The older version, Java 1.4.2, and the newer version, Java 1.5. For most of the semester, it will not matter which version you are using. We will not make use of the new features in Java 1.5.

You need a Java virtual machine

You will need the Java software development kit (JDK) from the Sun website. THIS MAY ALREADY BE ON YOUR COMPUTER. Don't attempt to download and install it unless you know you don't have it. If you have a Macintosh running Mac OS X, you almost certainly have it. If you have a PC, this site can check whether you have it:

If you need the Java software development kit (JDK) get it from this website:

See the Popular Downloads link on the right side of that page. Choose J2SE 5.0. Also, choose the J2SE JDK or SDK (not just the JRE and not the 'bundles' that include other programming environments, such as netBeans). Warning: this is a big download!

Can't execute jar files

If you cannot double-click on a jar file to start it running, or if you cannot execute any of the commands java, javac, javadoc, or jar, you probably have not set your path correctly. We explain this for Windows 2000; older windows systems are similar.
Your system contains a variable that lists directories with executable files in them. Type 'path' in a command-line window. The line that is printed contains path names separated by semicolons. For example, one path name may be:

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C:WINNTsystem32

There should be a path that looks like this: C:j2sdk1.4.1_02bin. This is a directory called bin inside the directory where you installed the sdk. It may be different on your computer. If such a path is not there, you have to add it. Bring up the help in your Windows system, open the index, and look for 'path'. There, you will find instructions on appending another directory to variable path. It may be something like this (but read the instructions):
path %path%;C:j2sdk1.4.1_02bin

Downloading DrJava

Can I Get Drjava On Mac

The easiest thing for you to do is to download this version of DrJava drjava-stable-20080106-0744. This version is supposed to work whether you have Java 1.4.2 or Java 1.5, and we advise using it.

If you want, open this web page (by clicking the link) in your browser and choose another version of DrJava to download. Get the latest version. Note that DrJava won't run unless you have a Java 2 v1.3 (or later) virtual machine already installed.

Warning: you may get a dialog saying something about a 'JAR archive security check'. If you do, just right-click on the DrJava download link and select 'Save Link As' (or the equivalent in your browser).

We know that all this setup can be annoying, but you have to do it only once!

A common DrJava problem: finding tools.jar

Question: I downloaded Sun's J2SE SDK and DrJava. When it came to actually running DrJava, the following window kept popping up even though somehow DrJava still managed to run without me finding the file --what should I do?:

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Compiler not found. The file you chose did not appear to contain the compiler. Would you like to pick again? The compiler is generally located in 'tools.jar', in 'lib' subdirectory under your JDK installation director. (If you say 'No', DrJava will be unable to compile programs.)

Answer: First, make sure you installed the Java SDK, not the JRE. (See above.)

Next, file tool.jar comes with the JDK. The usual location is

C:Program FilesJavajdk1.5.0_02libtools.jar

if you have followed the default options during the JDK download process. You can also use a desktop tool to search for this file on your computer. You simply need to set DrJava's Preferences to the correct path. To do so, follow these menu items: Edit - Preferences - Resource Locations - Tools.jar Location then type or browse to the correct location.

Running DrJava

There are several ways to run DrJava:

  • From the command line, you can type java -jar drjava-stable-20061025-1556.jar
  • On many platforms, you can simply double-click the jar file to start DrJava.
  • On OS X, you can download the drjava-stable-20061025-1556.jar-osx.tar.gz package. You can then run DrJava as a normal application.

Documentation --how to use DrJava

The demos given in class and in the demo sessions should help, if you take notes. However, here is documention on using DrJava (http://drjava.sourceforge.net/userdocs/) on the web.

Wrong-version error.

Do you get a message that looks like this?

Error: cannot access javax.swing.JFrame
bad class file: C:Program FilesJavajre1.5.0librt.jar(javax/swing/JFrame.class)
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the classpath.

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It may mean that your computer has two different systems on it and is an inconsistent state. If your computer has jre5.0, then it cannot use SDK 4.7. Uninstall SDK4.7 and download JDK 5.0 and use its tools.jar.


There are several ways to run DrJava: From the command line, you can type java -jar drjava-stable-200.jar; On many platforms, you can simply double-click the jar file to start DrJava. On OS X, you can download the drjava-stable-200.jar-osx.tar.gz package. You can then run DrJava as a normal application. Get Java for your Mac Download Java for OS X directly from Oracle. Get the latest version If an app or webpage you want to use asks you to install Java software, you can download the current version of Java for OS X directly from Oracle's website. Download the DrJava IDE for Windows, Mac or Linux. Windows users can simply double click the program and it will launch. Mac and Linux users can run the following command in the directory where the JAR file lives: java -jar drjava.jar. Right-click on the DrJava file and select create shortcut from the popup menu. (Mac OS X) DrJava runs as a normal application. Double click to start it. The first time you start DrJava on Windows and some other systems, you may get a message saying 'DrJava cannot find any Java compiler.

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