Configuration file created for BlueJ, a Java development environment; contains administrator settings for the BlueJ program such as the desired language and location of libraries.

There are two ways to change BlueJ configuration settings: To change user options, with the application open, select BlueJ from the menu bar, then Preferences.... You can alter settings in this dialog box. To change administrator options, open the file located at: BLUEJ_HOME/lib/bluej.defs. If on a Mac, right-click the BlueJ application, select Show Package Contents, then Contents, then Resources, then Java. You should then see the bluej.defs file and other DEFS files. Once you open a DEFS file, it will contain a list of properties in the following format: property-name = value The property name should never be changed but the values can be changed to alter the configuration.