the custom error module does not recognize this error.

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It’s a quick way to see all the user-defined Elixir modules available to the :my_app application at that point in your Elixir application. IO.inspect :application.get_key(:my_app, :modules) Combine this with the IO.inspect/1 function and it will show you all of the available user-defined Elixir modules at that point in time. Use :application.get_key(:my_app, :modules) wherever the module is not available error is occurring. It’s a list of user-defined modules available to your application from compilation. While this file may appear a bit cryptic, you can probably ascertain what the modules entry shows. Specifically, this file is usually located in: Still can’t find the module? Well, one debugging trick is to check a list of all the currently loaded, user-defined modules in the application.įirst, you can check the my_app.app compiled file in your /_build directory. App.User, in this case, would need to be aliased first.

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Sometimes, in a bout of “in the zone” programming, you may have written a call to a module that you believed you had aliased, but forgot to include the alias function call.įor example, trying to call User.full_name() when the full function call is _name() would result in the module is not available error. App.User not User, that you are using the proper punctuation, i.e.

App.User and not App.Users, that you have included your application name if needed, i.e. Some things to look for are that everything is spelled correctly, i.e. This almost goes without saying, but every time I don’t check the module definition first, it turns out I’ve misspelled one of my module definitions.Ĭheck the top (usually top) of your file for your defmodule function. Elixir’s “module is not available” error can drive you nuts.Īfter writing a lot of Elixir and seeing this error often, I’ll developed a few quick tricks that you can use to solve why your module is not available in seconds instead of minutes. This contains the same information as the aforementioned Whitelabel HTML error page and looks as follows: // fallback method ( Exception. Similarly, when dealing with REST requests, Spring Boot automatically returns a default JSON response in case of errors. The Spring Boot Whitelabel HTML Error Page This is what the Whitelabel HTML page looks like in your browser: Sun Aug 15 14:32: There was an unexpected error (type=Internal Server Error, status=500). This is what such a page looks like: Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

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This so-called Whitelabel Error Page is nothing more than a white HTML page containing the HTTP status code and a vague error message. When no valid mappings can be found, Spring Boot automatically configures a default fallback error page. This mapping depends on what is set on a ViewResolver class.

Particularly, Spring Boot looks for a mapping for the /error endpoint during the start-up. This is the list of all the prerequisites for following the article:īy default, Spring Boot offers a fallback error-handling page, as well as an error-handling response in case of REST requests. Let's see everything required to get started with custom error handling in Spring Boot and Java. Achieving it requires more effort than you might think, and you need to delve into a few essential Spring Boot notions. This is why implementing custom error handling logic is such a common and desirable task. The problem is that this information may be poor or insufficient for the API callers to deal with the error properly. Specifically, whenever an error occurs, a default response containing some information is returned. REST applications developed in Spring Boot automatically take advantage of its default error handling logic. TL/DR: Let’s take a look at everything required to build custom error handling logic in both Spring Boot Web and Spring Boot Security