OEM 13c - emctl start oms failing with error - java.io.IOException: Cannot run program "null/common/bin/wlst.sh": error=2, No such file or directory

After the abnormal server reboot, we are unable to startup the OEM services and encounter the below error.

Error:

[oracle@krishna bin]$ ./emctl start oms
Oracle Enterprise Manager Cloud Control 13c Release 5
Copyright (c) 1996, 2021 Oracle Corporation. All rights reserved.
[oracle@krishna bin]$ ./emctl status oms
Oracle Enterprise Manager Cloud Control 13c Release 5
Copyright (c) 1996, 2021 Oracle Corporation. All rights reserved.
WebTier is Down
[oracle@krishna bin]$ ./emctl stop oms -all -force
Oracle Enterprise Manager Cloud Control 13c Release 5
Copyright (c) 1996, 2021 Oracle Corporation. All rights reserved.
Stopping Oracle Management Server...
Error Occurred: Cannot run program "null/common/bin/wlst.sh": error=2, No such file or directory
Please check /u01/oracle/product/13.5.0/em/gc_inst/em/EMGC_OMS1/sysman/log/emctl.log for error details
[oracle@krishna bin]$

Solution:

OPTION1:

Restore the file emgc.properties file from valid backup.

OPTION2:

1. A typical emgc.properties in EM13c would have sample entries such as below:

  

COMMON_ORACLE_HOME=<OMS_HOME>/oracle_common

oracle.sysman.emSDK.svlt.ConsoleServerName=<OMS_HOST>\:<PORT>_Management_Service

JBO_POOL_TTL=-1

AS_PORT=0

EM_UPLOAD_HTTP_PORT=<EM_UPLOAD_HTTP_PORT>

EM_NODEMGR_HOME=<GC_INST>/user_projects/domains/GCDomain/nodemanager

MSPORT=<MSPORT>

ADMIN_SERVER_NAME=EMGC_ADMINSERVER

AS_HTTPS_PORT=7102

EM_REPOS_CONNECTDESCRIPTOR=(DESCRIPTION\=(ADDRESS_LIST\=(ADDRESS\=(PROTOCOL\=TCP)(HOST\=<REPO_DB_HOSTNAME>)(PORT\=<REPO_DB_LSNR_PORT>)))(CONNECT_DATA\=(SID\=<REPO_DB_SID>)))

OHS_ADMIN_PORT=<OHS_ADMIN_PORT>

OMS_HEAP_MAX=1740M

EM_CONSOLE_HTTP_PORT=<EM_CONSOLE_HTTP_PORT>

WLS_HOME=<OMS_HOME>/wlserver

JBO_LAZY_LOAD=true

EM_UPLOAD_HTTPS_PORT=<EM_UPLOAD_HTTPS_PORT>

oracle.sysman.emRep.repositoryMode=repository

AS_HOST=<OMS_HOSTNAME>

OMS_PERMGEN_MAX=768M

EM_DOMAIN_HOME=<GC_INST>/user_projects/domains/GCDomain

EM_CONSOLE_HTTPS_PORT=<EM_CONSOLE_HTTPS_PORT>

CURRENT_OMS_MODE=default

EM_NODEMGR_PORT=<EM_NODEMGR_PORT>

EM_DOMAIN_NAME=GCDomain

MS_HTTPS_PORT=<MS_HTTPS_PORT>

EM_INSTANCE_HOST=<OMS_HOSTNAME>

AS_COHERENCE_PORT=<AS_COHERENCE_PORT>

WEBTIER_ORACLE_HOME=<OMS_HOME>/ohs

MW_HOME=<OMS_HOME>

JBO_MIN_POOL_SIZE=1

EM_INSTANCE_HOME=<GC_INST>/em/EMGC_OMSn

JBO_MAX_POOL_SIZE=50

IS_ADMIN_HOST=true

AS_USERNAME=weblogic

OMS_HEAP_MIN=256M

ORACLE_HOME=<OMS_HOME>

NM_USER=nodemanager

OPSS_USER=SYSMAN_OPSS

OMSNAME=EMGC_OMSn

JBO_MAX_CURSORS=5

EM_REPOS_USER=SYSMAN

JBO_RECYC_THRESHOLD=50

OMS_PERMGEN_MIN=128M

OHS_COMP_NAME=ohsn

 

Note: The port numbers and other settings are OMS specific and the above-depicted entries are just a sample.

Recreate the file using the entries from one of the EMGC_OMSn.out* file under <gc_inst>/user_projects/domains/GCDomain/servers/EMGC_OMSn/logs on the respective OMS node.

2. Start the OMS

Reference - EM 12c: Emctl start/stop/status oms Failed With Error Exception in thread "main" java.lang.NoClassDefFoundError: org.apache.log4j.Logger (Doc ID 2065293.1)