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When Eden space is young generation is full, minor GC will be triggered. And in the minor GC process, non-free objects in Eden and one source Survivor space will be copied to another destination Survivor space.
My question is, if the destination Survivor space is full, how could minor GC handle?
If it is not possible to do / complete a minor collection, then a major / full collection is performed. This is typically done using a mark-sweep-compact algorithm rather than copying algorithm … which is one reason why full collection is expensive.
But ultimately (if you keep filling the heap) a full collection will not be able to reclaim enough space to continue and an OOME will be thrown. (Or if you are using
-XX:+UseGCOverheadLimit, the OOME will be thrown when the percentage time spent in GC exceeds a designated threshold.)