DataHandler.getDataSource: JavaDoc, and declaration indicate possible IOException. There's no explanation of what conditions, or implementation semantics could possibly lead to this, so I can't test for that case. A review of the code indicates that that in fact this will never happen.

This is a simple accessor function. Calls to it should not have to be wrapped in a try block.

In the object case, an ObjectDataSource is constrcuted, but that constructor just stores its arguments and doesn't throw either.