According to Enerjy, Tapestry comes in at about the top of the list for open source projects they've scanned. I suspect that T5 is quite a bit larger than the other top projects, and T5 probably also gets knocked down because I tend not to JavaDoc implementations, just the interfaces.
Also, looks like it doesn't understand Tapestry components, or the concept that the visible annotations on fields are both functional and documentation providing. Oh, and it hates that I don't use braces on trivial if statements.
This is all fine and good, though the code inspections built into IntelliJ were of more use to me.