Books on jvm

I would like to learn in more detail how the virtual machine actually works. Anybody read or know of a good book on this topic which they would like to suggest ?

From what I can find on Amazon most books on this topic are quite old. For instance I found this comparison of three books on the topic but it is from 1998 so I don't know how relevant they are today:

http://www.javaworld.com/javaworld/jw-03-1998/jw-03-bookreview.html

Any suggestions ?

Br,
Sven T.

What a coincident! I was actually also looking for a book on JVM. So I searched Amazon and a national site called bokpris.com (if u happen to also be swede, this site compares prices of all national and international bookshops).

But just like you, I couldnt find any that was new. But also I found out that many books where on how you program your own JVM which Im not interested in doing. I want to learn how they work in a more detailed way.

So if any cowboys or cowgirls (...hello) here in Javaranch does have any feedback pls give it to another hungry cowboy!

Things really haven't changed much, that's why all the available books are old. No books ever covered the kind of implementation details of Sun's JVMs that have changed because they're invisible to the Java programmer. "The Java Virtual Machine Specification" is about all you need in this regard.