When complete not working in completion Stage

Hi,
I am using the following code..
 

dao.update(table, rblKycRequestDetailsJsonObject).whenComplete((__,_1)->{
      System.out.println("xyz");
    });

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And executed it.
But the string xyz is not getting printed in the console.
As per what i read whenComplete will get executed in both cases when the future completes
normally or exceptionally.

This is the update function in dao :
 

public CompletionStage<Integer> update(Table table, JsonObject jsonObject) {
    logger.debug("Inserting data in generic dao")
        .attr("table", table)
        .attr("jsonObject", jsonObject)
        .log();

    return getPostgresInstruction(table, jsonObject)
        .thenCompose(postgresInstruction -> update(postgresInstruction));
  }

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Thanks