DrJava Installation with Java SE 7 or Java SE 8 JDK
DrJava is an integrated development environment (IDE) for writing, compiling and debugging programs in the Java programming language. This documentation is focused only on getting DrJava running, other documentation is available at the end of this post.
NOTE: (9/7/2015) The Mac version of DrJava has been removed from this documentation. Although you can still download it from Sourceforge, you cannot use JDK 7 or JDK 8 with the Mac version. These have been updated to allow you to use JDK 8. As of this writing, DrJava JAR works with JDK 8u60.
DrJava works with JDK 7 and JDK 8 according to the release notes.
Answer two short questions:
Is your operating system Windows, Mac or Linux?
If it’s Windows or Linux, is your operating system 32- or 64-bit?
Visit Oracle to download a version of Java SE 7 JDK or Java SE 8 JDK for your specific operating system. Both 32- and 64-bit versions are available for nearly every platform.
Install the Java SE JDK on your operating system according to the manufacturers recommendations.