Fix for 6973831: NPE when printing stack trace of OOME
Webrev at:
http://cr.openjdk.java.net/~mchung/6973831/webrev.00/
The VM preallocates OutOfMemoryError objects to improve OOM
diagnosability. The constructor is not invoked since the OOME object
allocation is done at VM initialization time and thus the new
suppressedExceptions field is null which causes NPE when
Throwable.printStackTrace() method is called on the VM preallocated OOM
object.
The fix is to initialize the suppressedExceptions field to null instead
of Collections.emptyList(). An alternative could be to initialize the
suppressedException field in the VM after VM initialization is
finished. It doesn't handle the case when any new field initialized to
be non-null is added in the OOM object in the future and it would
require a VM synchronized change. The libraries fix is simpler and
preferred.
Thanks
Mandy
