oacore services down and not starting:

oacore was down with error:
./adopmnctl.sh status -l

OC4JGroup:default_group          | OC4J:oacore        |     N/A | Down     |        N/A |      N/A |       N/A | N/A

Solution:
1.Start component invidually.

./adopmnctl.sh startproc ias-component=OC4JGroup:default_group

2.Kill the precess relevent to corresponding jvm process and re-start individually:

ps ux

./adopmnctl.sh startproc ias-component=OC4JGroup:default_group

3.Stop and re-start:

./adopmnctl.sh stopall
./adopmnctl.sh startall