Hi @farooq.zubairi ,
As mentioned by Jaideep earlier , 9.9 Core Fix 8 is very old , it is likely that this issue has been resolved in later fixes . If upgrading the version is not an option for you , do consider installing latest core fixes on 9.9.
Also do check out the linked issue JDBCPools scheduler stuck at Next Run 0.0 - Active - #5 by mcser76 , the error stack trace is identical, You can check if this applies to you.
-NP