I've used this book for several months now - and there are just too many mistakes in the text. Mistakes that will lead a J2EE component developer to make design/coding mistakes that will take a lot of hard work to figure out.For example: page 217: Introduction to Entity Beans"Rules for Implementing ejbFinder methods" ..."The method must not throw the java.rmi.RemoteException"Note: the NOT - wrong - it must declare that it throws RemoteException!This is just one of many examples - and if you check the errata on the web site - it doesn't contain very many of the mistakes (not this one) so one is left with very poor misleading information.Do technical books not get edited by technical editors? Demand better books - vote with you money - buy a different book! Or buy mine use - I'll sell it cheep!