I read "Professional Tomcat 5" (Wrox Press). Not bad, but I'd say for "real" problems the mailing list is still the best source of information. BTW the Tomcat online documentation is in fact far above open source average and some books are mainly a beautified "copy" of it. Professional Tomcat 5 also doesn't cover 5.5.x, just 5.0.x and I'm not aware of any 5.5.x book.
Yeap, I'm reading it too. As you said it does not cover 5.5.x, and, for instance, talk about the jk2 connector, which you should not use anymore, but I found it "easy" to read, quite complete, (and, well, I love books :-) Gaël
