What is large object for JVM GC

Question

Charlie Hunt says that large object is bad for JVM GC in his presentation. Because:

1. Large objects are expensive to allocate and initialize.

Answer 1

There is no theoretical definition on its size but this will depend upon your JVM configuration for example if young generation is small then even small classes will be causing too many swaps (GC). If your objects are big enough w.r.t your JVM heap then GC will have to do more work to allocate and claim them from heap. This will lead to "stop the world" problem more often.