Problem :
oafm,forms and oacore not starting up after IP adress change

Solution:
1 - open a new shell and set your apps environment

2 - cd

3 - Stop OPMN service by executing adopmnctl.sh

4 - check if it is really down:
ps -ef grep opmn

5 - delete the following:

rm -fr $INST_TOP/ora/10.1.3/j2ee/oacore/persistence/*
rm -fr $INST_TOP/ora/10.1.3/j2ee/oafm/persistence/*
rm -fr $INST_TOP/ora/10.1.3/j2ee/forms/persistence/*

6 - execute autoconfig at the Application Tier

7 - start all Applications Services

8 - check if the issue has been resolved:
adapcctl.sh status