Oracle Enterprise Manager failed to start, OC4J Configuration issue. Configure Enterprise Manager Database Control Manually with Enterprise Manager Configuration Assistant

You can drop the EM Repository

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[oracle@localhost ~]$ emca -deconfig dbcontrol db -repos drop
STARTED EMCA at Aug 5, 2013 7:54:35 PM
EM Configuration Assistant, Version 11.2.0.0.2 Production
Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:
Database SID: fmw
Listener port number: 1521
Password for SYS user:
Password for SYSMAN user:

Do you wish to continue? [yes(Y)/no(N)]: Y
Aug 5, 2013 7:54:54 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/fmw/emca_2013_08_05_19_54_34.log.
Aug 5, 2013 7:54:55 PM oracle.sysman.emcp.EMDBPreConfig performDeconfiguration
WARNING: EM is not configured for this database. No EM-specific actions can be performed.
Aug 5, 2013 7:54:55 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) ...
Aug 5, 2013 7:57:04 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Enterprise Manager configuration completed successfully
FINISHED EMCA at Aug 5, 2013 7:57:04 PM

Now, let's configure it again


Create new for EM repository
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[oracle@localhost ~]$ emca -config dbcontrol db -repos create
STARTED EMCA at Aug 5, 2013 7:58:22 PM
EM Configuration Assistant, Version 11.2.0.0.2 Production
Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:
Database SID: fmw
Listener port number: 1521
Listener ORACLE_HOME [ /u01/app/oracle/product/11.2.0/dbhome_1 ]:
Password for SYS user:
Password for DBSNMP user:
Password for SYSMAN user:
Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
-----------------------------------------------------------------

You have specified the following settings
Database ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1
Local hostname ................ localhost.localhost.com
Listener ORACLE_HOME ................ /u01/app/oracle/product/11.2.0/dbhome_1
Listener port number ................ 1521
Database SID ................ fmw
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............
-----------------------------------------------------------------

Do you wish to continue? [yes(Y)/no(N)]: Y
Aug 5, 2013 7:58:53 PM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /u01/app/oracle/cfgtoollogs/emca/fmw/emca_2013_08_05_19_58_21.log.
Aug 5, 2013 7:58:54 PM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Aug 5, 2013 8:05:56 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
Aug 5, 2013 8:06:02 PM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while) ...
Aug 5, 2013 8:07:14 PM oracle.sysman.emcp.EMReposConfig invoke
INFO: Uploaded configuration data successfully
Aug 5, 2013 8:07:17 PM oracle.sysman.emcp.util.DBControlUtil configureSoftwareLib
INFO: Software library configured successfully.
Aug 5, 2013 8:07:17 PM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary
INFO: Deploying Provisioning archives ...
Aug 5, 2013 8:08:07 PM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary
INFO: Provisioning archives deployed successfully.
Aug 5, 2013 8:08:07 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while) ...
Aug 5, 2013 8:08:53 PM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Database Control secured successfully.
Aug 5, 2013 8:08:53 PM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Aug 5, 2013 8:10:16 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Aug 5, 2013 8:10:17 PM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is https://localhost.localhost.com:5500/em <<<<<<<<<<<
Aug 5, 2013 8:10:28 PM oracle.sysman.emcp.EMDBPostConfig invoke
WARNING:
************************ WARNING  ************************

Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted.  The encryption key has been placed in the file: /u01/app/oracle/product/11.2.0/dbhome_1/localhost.localhost.com_fmw/sysman/config/emkey.ora.   Please ensure this file is backed up as the encrypted data will become unusable if this file is lost.

***********************************************************
Enterprise Manager Configuration completed successfully
FINISHED EMCA at Aug 5, 2013 8:10:28 PM

[oracle@localhost ~]$