Unavailability of Jar for connectivity in Postgres

Dear Team,
Good Wishes.

We are planning to migrate one of our critical applications from Oracle to 11.1 Postgresql. The UI of the application calls lots of PL/SQL procedures. In order to have that calling facility there is a jar provided by the respective databases. Currently the ODBS-JDBC connectivity drivers are provided by Oracle in the form of jar. However connectivity from UI to call procedures in Postgresql is currently not possible in absence of such a driver. The reason being no jar is provided for such connectivity for version 11.1 Postgresql.

This challenge has become a show stopper for migration, please let us know whether any alternative are available for the same.
Regards
Nikhil

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