Hibernate: 5.4.0.Final
PostgreSql: 9.6.6 (It would be an option to upgrade to latest version)

CREATE OR REPLACE FUNCTION myFunction(param1 "A"[], param2 "B") RETURNS SETOF "C" AS $$
    BEGIN
......
    END;
$$ LANGUAGE plpgsql;

ProcedureCall call = session.createStoredProcedureCall("myFunction");

call.registerParameter(1, <Type?>, ParameterMode.IN).bindValue(listOfEntities);
call.registerParameter(2, EntityForTableB.class, ParameterMode.IN).bindValue(entityForTableB);

((ResultSetOutput)call.getOutputs().getCurrent()).getResultList();

org.postgresql.util.PSQLException: ERROR: Function myFunction(bytea, bytea) does not exist