JDBCClient client = JDBCClient.createShared(vertx, new JsonObject()
                .put("url", "jdbc:oracle:thin:@localhost:8787:TEST")
                .put("driver_class", "oracle.jdbc.OracleDriver")
                .put("user", "user")
                .put("password", "****"));

 client.getConnection( connection -> {
      if (connection.succeeded()) {
          SQLConnection con = connection.result();

         JsonObject params = new JsonObject()
                    .put("query", "{ call ? :=  package.procedure(?) }")
                    .put("paramsIn", new JsonArray().addNull().add(89))
                    .put("paramsOut", new JsonArray().add(JDBCType.REF_CURSOR));

          con.callWithParams(params.getString("query"), params.getJsonArray("paramsIn"),  params.getJsonArray("paramsOut"), query -> {
               if(query.succeeded()){
                     ResultSet rs = query.result();
                     System.out.println(rs.toJson().toString())
                 }else{
                  System.out.println(req.body() + query.cause().toString());
                 }
                });
             } else {
 System.out.println(connection.cause().toString())
             }
            });

CallableStatement stmt = conn.prepareCall("{ call ? :=  package.procedure(?) }");

stmt.registerOutParameter(1, OracleTypes.CURSOR);
stmt.setInt(2, 89);

stmt.execute();
ResultSet rs = (ResultSet)stmt.getObject(1);

JsonObject params = new JsonObject()
            .put("query", "{ call ? :=  package.procedure(?) }")
            .put("paramsOut", new JsonArray().add(JDBCType.REF_CURSOR));
            .put("paramsIn", new JsonArray().addNull().add(89))