Java objects inside out

One of the frequently asked questions about objects in Java is how much do they take up in memory. In absence of "sizeof" language or library operation, programmers can only guess about the footprint of their code or refer to the legends and tales of specialists.

In this talk, we'll try to look inside Java objects and see what lies in them. After that many tricks in the objects, footprint should become clear, as well as some features of runtimes, and it will be obvious what can be exploited for dirty low-lever purposes.