I heard that i can get this book online: Core J2EEPatterns: Best Practices and Design Strategies by Deepak Alur, John Crupi, Dan Malks can somebody tell me? Thanks!
No you cannot get the book online (not free). However by "get the book online" if you meant electronic version of the book, then go to http://safari.oreilly.com and subscribe to the books. This book is one of the many books they offer online (of course you have to pay)
Also wanted to add that, towards the end book has J2ee patterns catalog, which is available online. But remember, the book offers lot more than just the catalog