dba_job is not running in oracle database?

issue:
dba jobs is not running on oracle database and its hanging

solution:
Please check the job queue process parameter value ,it should be equal or more than the no of job running on the database.

Opatch throws error in oracle database

issue:

The java class could not be loaded. java.lang.UnsupportedClassVersionError: (oracle/opatch/OPatch) bad major version at offset=6

OPatch failed with error code 1

solution:
Please use recent Opatch utility to resolve this issue/use recent version of JDK/JRE