Finally, an easily understandable book with a nice structure for beginners that deepens as it progresses. It doesn't throw you straight into the deep end, maintaining a good learning curve to keep your interest and allow you to progress comfortably.

The book is good if you buy the English edition.
There is plenty of material from the publishing company that electronically "accompanies" the book.
It is quite extensive and within its 1600+ pages it covers perhaps too much for a beginner (The first 900 pages along with some appendices could easily constitute a good book on their own).
It contains many exercises but unfortunately there are no solutions for checking (at least not for the difficult ones). Of course, the book is quite popular and I believe that there might be people on GitHub who have solved the exercises and provide their answers.

The big problem is its translation. Many mistakes, many concepts that perhaps should not be translated into Greek because they confuse more, whole sentences that make no sense, etc.
-For example, I quote half a sentence from the book: "Tightly controlling access and presentation of private data can greatly reduce errors, ..."

I would suggest, if you want to take a look at the book, to go directly to the original, untranslated version. (And get the latest edition of Java 9, of course.)