When I try to use the ‘show call hierarchy’ feature, it only partially works. the callee hierarchy shows up just fine, but the caller hierarchy does not. There is no error message. However, if I try to search for references to a method in the project, I get at least some search results, but in addiiton a window pops up with the title ‘Java Search’, and the phrase ‘I/O exception’. It has a details button, but it is grayed out. This is Eclipse 3.2.1. Any clues at all would be appreciated.