EmailLogger | Email engine for CakeLog , CakePHP | Web Framework library

I'm trying to convert the Java code of a design pattern called Chain of Responsibility in Kotlin idiomatically. But I'm not getting any clue on converting the default method appendNext() of Java interface in Kotlin. I tried some already existing questions like this and this but they don't seem to be working for my use case.

I tried converting the default method appendNext() to an extension function in Kotlin. But apparently Kotlin doesn't seem to find the method Logger.message() and throws NoSuchMethodError.

I have given the original Java code and the Kotlin code I tried so far in the following snippets.

I would prefer a Kotlin idiomatic solution of this code without using the @JvmDefault annotation. The code should be as concise as Java if not more. Any help would be much appreciated.

This is the correctly working Java code for the design pattern Chain of Responsibility:

I have an environment with some extreme constraints that require me to reduce the size of a planned Python 3.8.1 installation. The OS is not connected to the internet, and a user will never open an interactive shell or attach a debugger.

There are of course lots of ways to do this, and one of the ways I am exploring is to remove some core modules, for example python3-email. I am concerned that there are 3rd-party packages that future developers may include in their apps that have unused but required dependencies on core python features. For example, if python3-email is missing, what 3rd-party packages might not work that one would expect too? If a developer decides to use a logging package that contains an unreferenced EmailLogger class in a referenced module, it will break, simply because import email appears at the top.

Do package design requirements or guidelines exist that address this?

Background

Currently creating a web api which will need to talk to another web api which I have created. This problematic web api is out the box and the only changed I have mad is to enable cores and added two classes to it.

Problem

Currently this web api is executing all the way to my integration point however when it hits HttpResponseMessage hrm = await hc.GetAsync(requestUrl); it stops and does not give me an error. I tried putting a try catch on that function however it ignores that try catch aswell. The following code will show how I am building this web api.

Code

Controller

Background info

I am currently working on a email crawler which will make records in a db of emails which I have crawled for information. Currently my company has constrained me into using Petapoco for code maintenance issue. The current issue I am running to is duplicate record are being recorded into the the db. I have been looking for examples or documentation that can give me a hint on how to achieve this but I have not been able to find any.

Issue

Currently I am able to insert records into the db with out an issue, but it also inserts duplicates as well.

Additional information

The Column I am trying to make sure is unique is [AppointmentUniqueId] , I have a primary key of Id, my table is AppointmentActivities, and the what I am trying to insert is a class model of a record .

Current Code