This is a feature of JBuilder Enterprise.
To use this wizard, select File|New. Select the Enterprise tab. Select Sample IDL. For this option to be available, an Object Request Broker (ORB) must be selected from the Build page of the Project|Project Properties dialog.
This wizards creates a simple IDL file that may be used to experiment with the various CORBA tools that take an IDL file as input. The name can easily be changed in the wizard and the content can be edited in the Source pane, making this an easy way to create an IDL file. The generated IDL file will consist of a module and an interface containing a single method that can be customized.
For more information on using IDL files, see "Exploring CORBA-based distributed applications in JBuilder" in Distributed Application Developer's Guide.