Java Full GC - 浮动垃圾？

Question

Currently I am learning about GC in Java, but I need some clarification. Let's say we have situation like on this picture:

According to this website first runs DefNew and after that Tenured GC. In that case:

• In DefNew Object A has reference from Old generation, this won't be collected.
• In Tenured (if I get it right), Object B won't be deleted because has a reference from Young Generation (Object A).

How does it works after all? I was thinking about dirty cards, but only Object C would be marked, because it was changed (deleted reference to Object B).

Answer 1

From an article about "nepotism" problem

This is 'pathological' because ANY promoted node will result in the promotion of ALL following nodes until a GC resolves the issue.

So I guess it will be promoted to Old gen first, then collected.