What version of Java does DrJava require?
To take full advantage of DrJava’s features, you will need to have either the JDK 6.0, the JDK 5.0 or the J2SE v 1.4.2 SDK installed on your system. We highly recommend version 5.0 or 6.0, as they provide a number of language features, additional APIs, and GUI improvements. If you are using version 1.4.0 or 1.4.1, you may see some buggy behavior, some of which is documented below.