ORACLE initialization or shutdown in progress

Exception:

java.sql.SQLException: ORA-01033: ORACLE initialization or shutdown in progress Error Code: 1033 [Caused by: ORA-01033: ORACLE initialization or shutdown in progress ] Check to ensure that the XML containing parameter data matches the parameter definitions in the XSD.
Contact oracle support if error is not fixable.

Cause:

This is not a JCA adapter problem. Please verify the stability of target database.