Questions tagged [error-handling]
Questions related to handling errors and exceptions. According to Wikipedia, Exception handling is the process of responding to the occurrence, during computation, of exceptions – anomalous or exceptional events requiring special processing – often changing the normal flow of program execution. It is provided by specialized programming language constructs or computer hardware mechanisms.
307 questions
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Fail fast is brittle
I am creating a CSV consumer (with Java). There is one field / column that should contain one of the values "Rename" or "Move".
I implemented this by allowing mixed case of letters,...
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14
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Avoiding throw because we are not sure the exceptions will always be caught
I'm a junior in my company, and one of the coding rules they have is:
"a constructor object must never fail" (i.e., never throw). So what if I give them an invalid parameter? Then, the ...
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Is throwing an error in programming is good Idea at all? [duplicate]
I am wondering if throwing an error in programming is good Idea at all ?
While programming we throw error when something unexpected or invalid has occurred. But if we have thrown exception and it is ...
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Error codes in a legacy C++ project [closed]
Background
I have a large C++ project which uses system error codes from errno.h, in C style.
int Cls::foo(A arg, O* out) {
if (!validate(arg)) return -EINVAL;
if (!out) return -EINVAL;
return 0;...
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CQRS how to display failed commands in the GUI
I am trying to use CQRS in my project and I was thinking how the GUI gets notified about failures in the GUI, when commands are fire and forget. My commandhandlers are not returning anything, but ...
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4
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352
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Watchdog/recovery mechanism for realtime embedded system (using heartbeat, exceptions and Posix signals)?
We have a large(ish) real-time embedded system. It's VxWorks, if that makes any difference. It has some C code in DKMs, but is 95%+ in C++.
It has absolutely no exception handling, nor Posix signal ...
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2
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C#: Refactoring an oversized try/catch/finally
Recently I've come to discover that I've inherited one of the internal auxilliary programs used. I've made a few minor fixes and features to improve it in the past, but now I've been given a major ...
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Deserializing serial protocol enums: Recoverable or unrecoverable errors?
I am currently implementing a library in Rust that implements a proprietary serial protocol.
The protocol specifies several enum values, that mostly are returned by the hardware as u8s (bytes), but ...
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1
answer
81
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Communicating unpredicted Failure from Repository implementation to Applicaiton Layer
My application follows Clean Architecture wherein the Application Layer wraps the Domain Layer. I try to adhere to DDD more-so as a "guiding light" than a strict rulebook.
Within the Domain ...
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2
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Choosing a strategy for representing and handling errors (or more generally status codes) in java 8
I asked this questions on StackOverflow but it's definitely a bit too broad.
Even for this website, although the question is about software design, it might not be enough "focused".
I am ...
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Standard error codes vs custom error codes in C
I am working on improving the code quality and portability of my C library, specifically a ring buffer implementation, that will be used in larger applications. I have encountered a dilemma regarding ...
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1
answer
485
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HTTP error 404 or 500 from an internal call to a separate API?
I have an endpoint in API 1 (my api) that queries API 2 (another companies api) to view and edit objects stored in API 2's database. API 1 is essentially acting as a wrapper service around API 2, ...
1
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1
answer
445
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How to E2E test handling of an unknown error in a client-server application?
Using a ton of libraries, IO, ... you cannot handle all imaginary errors.
You will need some form of "catch uncaught exception" handling to still have a control flow for such a case.
But if ...
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1
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190
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Bubbling errors upstream in async message-based services
Imagine a simple set up of an API and a 2nd service, where the API pushes some msgs to the message queue and the service pulls them and processes them.
Now, if an error occurs while processing a msg, ...
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3
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Error or not error?
I need to implement the following scenarios at the server:
User sent too many answers in a given amount of time, for example, it can't submit more than 3 posts within an hour.
User sent answer with ...
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3
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715
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Should I use the "die" idiom in C++?
If we implement the following function:
template <typename... Ts>
[[noreturn]] inline bool die(std::string_view message_format = "", Ts&&... args);
We can then write:
if (...
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2
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132
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How to tell client if predicate function fails?
Just say I have list APIs, and provide find() to search node.
With this design if something went wrong during pre-conditions, client would have no idea about it because no status code provided.
bool ...
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3
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225
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How to signal a dealbreaker error from a c-tor?
Context: 128kB RAM, freeRTOS.
Considered solutions:
Exceptions. Discouraged by both the memory size and the code style guide.
Late bool init(...);. Has worked for a decade but has it's problems - can ...
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324
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microservice custom error messages
We use microservices and spring boot in our saas (multi tenant) projects. We will proceed through the schema per tenant. We manage the error messages we show to the users through a database. We are ...
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3
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81
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How to Validate Output Binary During/After Compilation on Platform without ECC Memory [closed]
On a platform with ECC memory, you can assure the compiled binary is 100% legit with EDAC daemon. (single-bit error will be corrected automatically, and multi-bit error will be logged so you can just ...
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1
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Websocket client reconnection best practices
I wasn't sure whether to post this on StackOverflow or here. Let me know if you think it belongs on StackOverflow.
I have an application that will run semi-persistently, i.e. all the time. The ...
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2
answers
297
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Why does most software break or refuse to continue immediately if the folder where their data is stored is not available? [closed]
Most software creates a directory (usually in ~/Library or ~/Library/Application Support in MacOS) to store user preferences, browser history, etc. Most software attempts to create their data ...
user403833
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3
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Business logic error handling. Should exceptions really be avoided?
C#'s primary error handling mechanism are exceptions and try pattern.
We don't have access to discriminated unions yet like in case of F# and Rust Option<T> and Result<T, E> types.
The ...
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2
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161
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How can I avoid re-running code when exceptions are thrown and user re-submits?
I have a checkout process that 1) creates a user account in Stripe and my database, 2) creates a paymentMethod in Stripe and logs the last4 in the database, 3) creates the subscription in Stripe and ...
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2
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Determining the object that caused a null reference exception?
Frequently in applications we encounter situations that could throw a NullReferenceException; for example, assuming the following method's argument is a user defined reference type, accessing the ...
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2
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Is "error first" better than "if-else", why? [duplicate]
I have an eternal discussion in my work about why "error first" is "worng".
In order to ensure what I try to tell with error first is the following code pattern:
if condition:
...
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votes
4
answers
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What are the best practices when implementing C++ error handling?
I have searched stackoverflow for relevant questions and was surprised to find that I couldn't find any questions tagged with C++ with in depth discussions of best practices for error handling in C++.
...
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What is the current practice in handling connection errors when the service "offers" multiple IP addresses?
With the current implementation of getaddrinfo(), I'm not given any information about a timeout of the IP address(es) returned. The library implementing that function has the information, but I haven'...
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Is there a standard error handling design pattern for C?
I'm working on a large C application that I've divided into sub-libraries (e.g. networking, message handling, message building, etc.)
I've converged onto a pattern where functions are only allowed to ...
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API: should a problem with data be announced by a HTTP code or in the response body?
After years of (amateur, dirty) personal API development I finally decided to follow some best practices.
My problem: the API may have problems, say, retrieving some data. It will gracefully handle ...
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2
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Should an Express error handler be used to send HTTP 4xx responses?
In other words, should the raising of an HTTP 4xx code be considered an error, and should the job of sending an HTTP 4xx code to a client be delegated to an error handler?
Or is it simpler to just ...
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3
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Error handling. Is it always necessary?
So, today I was reading a piece of code I found this function:
Public Function FolderExists(sPath As String) As Boolean
Dim FSO As New FileSystemObject
On Error GoTo errHandler
sPath = ...
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Should servers exit with 0 or 1 in case of caught errors?
What is the best practice in case a service has an error which we caught and handled?
Do we exit code 1 or 0?
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Error handling for repository: exceptions or wrapping return value?
The question is about a desktop application I'm creating in C# and WPF.
As very common I'm using the repository pattern in my Data Access Layer for my CRUD operations. All data comes from the ...
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9
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"Dead programs tell no lies" in the context of GUI programs
In The Pragmatic Programmer, the authors write:
One of the benefits of detecting problems as soon as you can is that you can crash earlier, and crashing is often the best thing you can do. The ...
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539
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Best way to trigger javascript error to go to catch block
I have a couple of doubts regarding the quality of my code. I'm working on a helper function (for KoaJS) where I'm validating a Firebase ID token. If it is valid, I return the decoded token; otherwise ...
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5
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How to write retry code when failure is inidicated by throwing an error?
Assume I have an API that indicates failure by throwing an error (because errors are not expected). In this situation, how should retry code be written?
My first thought was to use something like this:...
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4
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Is having 3 return types for a function, in order to facilitate error handling a bad idea?
I have a function which returns either true/false, each return plays nicely with the function name: isOnline, however, there are cases in which I want to throw an error inside of it. Maybe the status ...
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2
answers
266
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Best way to display errors from a model to the user?
I'm developing an app (using Flutter) that has a model that contains most of the business logic, and a view that displays the user interface. The model can call notifyListeners to inform the view that ...
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1
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Clean way to handle different exceptions in Javascript?
I'm Java developer and I'm now learning Javascript creating a personal project.
I don't know how to handle different errors in Javascript in a clean way and I can't find a good solution on the web.
I'...
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Is there a easy and useful error handling algorithm for bottom-up based parser?
My English skill is poor because I'm not a native English speaker.
Please understand.
I wonder that there is a error handling algorithm easy and useful in LR parser.
LR Parser is bottom up based so it ...
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Is there a general solution to the problem of "sudden unexpected bursts of errors" in software?
Let me explain what I mean.
I have made a complex, highly polished over years PHP framework/library for my own use. I very aggressively log the smallest notice and immediately deal with it as soon as ...
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HTTP POST request status 200 vs 204 vs 404
Our POST API takes in an identifier (let's say deviceId) in order to compute the accuracy of the location we have stored for that device in a DB; the result of that compution is then saved in a ...
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Is it good practice to use try/catch like Python in Java?
I mainly use Python and just started learning Java. For now, I've tried using try/catch for basic file read/write as follows
public String[] readFile(String fileName){
try{
// read file
} ...
2
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1
answer
313
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Exception handling with adapter design pattern in JavaScript
I am using an opencv.js Web Assembly build in the browser. The build comes with a JavaScript interface to call the WASM functions but it does not provide any memory management. For example every time ...
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3
answers
263
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Which of these model error handling strategies makes most sense?
I am building an API in expressjs and, currently, mongo/mongoose. I currently have some model methods that return true or false, some that return a value or false, and some that return a value or ...
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What are the best practices for handling errors in multi-step actions between client and servers?
I have a website which uploads job postings to my API, there are multiple steps to doing this:
Upload a logo image to file storage.
Insert data about the job posting into a database.
Process a ...
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How to handle errors from back-end in front-end and different languages?
I have a rest api and a reactjs front end, in some cases, the api will send an error to the front end and I need to display that error. My app will support multiple languages, so the error must be ...
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5
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262
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Dealing with unwanted usages of a function
I am writing a function that I would not like to get called given a certain context and am wondering how best to convey that to possible users of the function. Assume, for exemplification, I am ...
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What is better way to track mistakes in error-prone part of a feature?
That is quite specific circumstances I've come across, and I somewhat struggle to find proper way how to approach this.
I'm given a class written in swift-language, which has a control property, like ...
