Database Control Shows - Java.Lang.Exception: No Such Metric After Login

check emoms.log file ( every dbconsole instance has a counterparter under oracle_home, please search it).

can show below error message:

ORA-28000: the account is locked (DBD ERROR: OCISessionBegin)

Also HOST CPU shows no data

unlock the dbsnmp, restart dbconsole.

alter user dbsnmp account unlock;