JVM core dumps on Solaris

Need help asap on know where/why my JVM core dumped. I've the logs from the process but they dont seen to indicate any odd thing. I've tried to debug the core using dbx like :

dbx /usr/bin/java ./core

but keep getting message:dbx: program is not activePls advise ASAP.

Can anyone also point how to contact Sun for this like sending them the core over etc.

[398 byte] By [BKBKa] at [2007-10-2 1:44:09]