Today I received an e-mail notification by JDC (Java Developer Connection) regarding closure of a bug I had voted for [free reg. required].
As per the resolution description, different Java programs (JVMs) running on the same machine will be able to share a large number of system classes using a technology termed as Class Data Sharing (CDS), thus signficantly reducing memory requirements and startup time.
This is indeed a great news! The only caveat is that this may not be available on Windows platform in the beginning (my favorite development platform).