Oracle Database DBConsole Enterprise Manager 10g and can't start after Change hostname

** Myself
emctl status  ( oracledbconsoleSID services)
register licensing
http://localhost:5500/em/console/aboutApplication
Administrator login
"Local Policies" go to user "Right Assignment." Add the user/group to "Logon as a Batch Job."
login
http://localhost:5500/em/console/logon/logon
## Case Change hostname and not usage DBConsole (OC4J change)
Step after change hostname to use database control
1. copy $ORACLE_HOME\<oldhostname>_sid to $ORACLE_HOME\<newhostname>_sid
2. copy $ORACLE_HOME\oc4j\j2ee\OC4J_DBConsole_<oldhostname>_sid to $ORACLE_HOME\oc4j\j2ee\OC4J_DBConsole_<newhostname>_sid
****$ORACLE_HOME\oc4j\j2ee is essential path