java.lang.NegativeArraySizeException

On starting weblogic on Solaris 10, I got this error

Could not load the performance pack that can take advantage of /dev/(e)poll device due to:
java.lang.NegativeArraySizeException.

I checked ulimit:

ulimit -n
65536

I reduced ulimit to 65534:

ulimit -n 65534

and weblogic started up fine.

I remember reading somewhere that java has array overflow issues if ulimit is set to maximum.