You may want to check out
Inside the Java 2 virtual Machine by Bill Venners. Many of the eariler chapters are available online there, and you can purchase the book for the remainder. Also, if you feel like studying Sun's own source code for the JVM, you can download it from one of the links on
this page. It's written in C, so it may take some time to figure out how the pieces work. But if you really want the "complete internal structure of the JVM", that's probably the place to go. (At least for one particular JVM implementation.) I would think that you'd be much better off starting with the
incomplete (and therefore much more manageable) views offered by the JVM spec and Bill Venners' book.
[ October 28, 2006: Message edited by: Jim Yingst ]