This post assumes you are carefully following the docs/BuildingDebugging.txt instructions (in the OpenBD source download).

First off, Java on Mac OS X does not have a tools.jar file so you can ignore the step in the OpenBD instructions about setting up the JDK_15_TOOLS class path variable (tools.jar is incorporated directly into the base JDK install on a Mac).

Second, when you import the OpenBD source project, it almost certainly won't let you attach it to a J2EE server (using the Servers view in Eclipse 3.3). This is because it does not have the correct project facets. Right click on your OpenBD project, select Properties, select Project Facets and then Modify Project... Add Java and Dynamic Web Module. Click Finish and then OK. Now you should be able to add the OpenBD project to your chosen server.

You may have duplicate libraries at this point (Vince did and I did but that may be due to attempting to build it without setting up the facets properly). Right click on your OpenBD project, select Properties, select Java Build Path and look at the Libraries tab - if you have duplicates, you'll get a red error message at the top, and you just need to delete the duplicates.

At that point, you'll need one source code change to get it to run. I'll cover that in a separate post.

http://screencast.com/t/r3O8poqx