MDS-01330: unable to load MDS configuration document

Following deployment error is seen in some cases when MDS configuration is incorrect

Error: oracle.fabric.common.FabricException: oracle.mds.config.MDSConfigurationException: MDS-01330: unable to load MDS configuration document   
MDS-01329: unable to load element "persistence-config"
MDS-01370: MetadataStore configuration for metadata-store-usage is invalid.   
MDS-01259: The metadata store "oracle.mds.persistence.stores.db.DBMetadataStore" cannot be instantiated.   
MDS-00003: error connecting to the database   
Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: Cannot get Connection from Datasource: java.sql.SQLException: ORA-01017: invalid username/password; logon denied

: MDS-01330: unable to load MDS configuration document   
MDS-01329: unable to load element "persistence-config"
MDS-01370: MetadataStore configuration for metadata-store-usage  is invalid.   
MDS-01259: The metadata store "oracle.mds.persistence.stores.db.DBMetadataStore" cannot be instantiated.   
MDS-00003: error connecting to the database   
Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: Cannot get Connection from Datasource: java.sql.SQLException: ORA-01017: invalid username/password; logon denied

Validate adf-config.xml if the MDS entries are proper and try to deploy again.