BlueJ version 1.3.0 beta 2 has just been released.
This version includes a number of interesting new features:
o Explicit support for
unit testing with
JUnit. A new tutorial named
"Unit Testing in BlueJ" is also available to introduce the new features.
o A new, open extension API. Using this API, anyone can now
write extensions (plug-ins) for BlueJ. The API documentation
and a guide to writing extensions for BlueJ are available from the
web site.
o Support for JDK 1.4.1 on MacOS. (We _strongly_ recommend that
MacOS users upgrade to jdk 1.4.1 to use this version. Older installed
BlueJ version will work unchanged with jdk 1.3.1 after this upgrade.)
o A new submission extension to submit projects to a teacher.
Apart from the features listed above, this version includes numerous smaller improvements and bug fixes.
You can get more detailed information and download from
http://www.bluej.org/ 
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