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Questions tagged [exceptions]

An exception is an occurrence in an application process that requires deviation from the program's normal flow.

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1 vote
5 answers
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End method in normal flow versus exception flow

Consider the two following examples: public Something fetchSomething(String key) { if(somethingsMap.containsKey(key)) { return somethingsMap.get(key); } throw new ...
steros's user avatar
  • 121
3 votes
1 answer
257 views

How to catch every exception in a multi-threaded C++ app with the minumum of code?

I have been tasked with the title above. There is currently zero exception handling. There are 100+ threads, all created from main(). Exceptions won't percolate up to main() - they won't leave the ...
Mawg's user avatar
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1 vote
2 answers
582 views

Exception Handling in Hexagonal Architecture

how could we advise the web client about a non-recoverable exception thrown by the persistence adapter ? At first sight, I would define a domain exception to be thrown by the persistence adapter and ...
hjoly's user avatar
  • 11
0 votes
1 answer
156 views

How to correctly extend runtime exception?

We have a GraphQL server which sends data to the front end client. We have other tenants who will use our sever and host their code. I want to create a system where they all can create any custom ...
user415612's user avatar
0 votes
1 answer
101 views

Return response from controller or raise exception from service

I need some guidance on how to send error responses to client from WebAPI controller for an update operation. I need to check if data is changed and if it has duplicate data. I have service class that ...
Sunny's user avatar
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2 votes
1 answer
122 views

Is returning Result types the standard way of dealing with errors in Kotlin?

Given that there are no checked exceptions in Kotlin, are Result types the correct way to indicate an exception occurred to the caller? For example, I have the following function in my code: suspend ...
Adam's user avatar
  • 272
-2 votes
3 answers
286 views

Locally throw exception and handle it

I came across a piece of legacy code, almost on the line of this (sample) int foo() { try { int id = generateID(); if (isIDUsed(id)) throw id; return id; } catch (int ...
Zoso's user avatar
  • 241
0 votes
2 answers
514 views

Is Authentication a good use case for a checked exception according to Effective Java (Bloch)?

There's a section about use of checked exceptions in Josh Bloch Effective Java and I find it a bit abstract to understand what he means by saying "when a user can recover from it". ...
TMOTTM's user avatar
  • 109
1 vote
1 answer
100 views

Throw generic exception vs front end friendly exception from util methods?

The below code sample given is for Salesforce but it is close to Java and you should be able to understand easily what I am trying to ask here. AccountController.getAccountsThatMeetSpecificCrtieria is ...
user3978's user avatar
  • 221
0 votes
1 answer
77 views

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 ...
John Hall's user avatar
  • 163
2 votes
3 answers
497 views

Exceptions vs Monads

I am curious about the utility of something like monads in the C# world. My experience with these kinds of things is mainly through Rust but I'm a dotnet dev for work I was thinking about the ...
Jeremy Farmer's user avatar
10 votes
8 answers
1k views

When are try/exceptions not an anti-pattern?

I just finished a discussion with colleagues regarding the use of exceptions in code. Here is the code (pseudocode) that they had written: resp = fetch(URL) if resp.status_code != 200: return ...
Daniel's user avatar
  • 517
5 votes
5 answers
2k views

Java Exception Error Enumerations Anti-pattern

Over the years I've many times seen folks enumerate error codes for exceptions in Java. I generally have felt this leads to more tedious code and does not provide value. For example, there will be an ...
Kirby's user avatar
  • 271
3 votes
4 answers
726 views

How to avoid code duplication when else and except are the same?

A simplified version of my code looks like this: def process( object ): try: if suitedForA( object ): try: methodA( object ) except: ...
Jann Poppinga's user avatar
0 votes
1 answer
119 views

Reuse same code for validation and runtime integrity checks?

Scenario I have a system where a user can upload an Excel file which is validated and then used to provide data for the application. There are two distinct operations I need to handle with this file: ...
donquixote's user avatar
20 votes
4 answers
4k views

How do non-RAII languages free resources during stack unwinding?

C++ features deterministic order of calling destructors up the call stack until the exception is handled somewhere. To my knowledge, neither Java nor (object oriented) Python provide this. In those ...
Vorac's user avatar
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1 vote
3 answers
236 views

Should you reuse a PHP exception's code when wrapping it?

When catching and wrapping an exception in PHP, assuming the new exception doesn't have a meaningful code of its own, should you also use the caught exception's code value? or the default value? In ...
TravisCarden's user avatar
-2 votes
2 answers
6k views

What are the possible *root causes* of a SocketTimeoutException?

I understand that a SocketTimeoutException (I'm in Java, but I guess it's the same in just about every major language) happens after a server or client doesn't respond after a period of time, let say ...
Mickael Bergeron Néron's user avatar
1 vote
2 answers
305 views

Should domain know about exceptions thrown from outer layer?

Let's take a hypothetical system, a state based, exceptions thrown from persistence layer or other outer layer, should propagate to ui layer through domain layer. Domain need not know about this ...
duckydude20's user avatar
-1 votes
1 answer
595 views

How to handle third-party libraries that can potentially throw, without knowing what kind of exceptions they may have?

I'm starting to run into this sort of dilemma while many third-party APIs, but I will use MongoDB for my examples. Consider the following code: var settings = MongoClientSettings....
Saturn's user avatar
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1 vote
1 answer
394 views

Is the use of a catch block as a "rollback mechanism" a bad thing?

I have a service that performs a series of actions based on user information (name, address, etc), one of the problems is that the User entity comes from a legacy third party API (as a repository) ...
Thiago Dias's user avatar
5 votes
6 answers
479 views

Unsupported concurrent calls, throw exception or log a warning?

Context Let's say I have a navigation service that allows me to navigate to a page. The Navigate method is async because an animation (about 250ms) is involved. public interface INavigator { ...
Batesias's user avatar
  • 244
14 votes
14 answers
8k views

Should I raise an exception/error when an optional argument is used but is not necessary?

Take this constructed example: def fetch_person(person_id, country_code=None): if is_fully_qualified(person_id): return person_source_1.fetch_person(person_id) else: return ...
André Christoffer Andersen's user avatar
0 votes
3 answers
151 views

Communicating error conditions in client API for remote RESTful server, what's the best way?

I'm writing an application based on a RESTful API located in a server (written in Python). An Android app will access the API endpoints to get, post, put or delete data. The usual. The server has a ...
ismarlowe's user avatar
1 vote
3 answers
956 views

Handling exogenous exceptions in layered architecture

Exogenous exceptions are that kind of exception that are unavoidable because they are throwed outside of our system's pristine logic. A good practice is to throw wrapped exceptions in lower layers ...
Scover's user avatar
  • 11
1 vote
2 answers
160 views

Is nesting try-except sequence in try-else block bad form?

Ive got a boot sequence that needs to check some registry values, they may or may not be present, so each check needs to be wrapped in its own try-except. I try to avoid nesting as I think it can lead ...
pstatix's user avatar
  • 1,047
2 votes
1 answer
172 views

How do we maintain consistent-read promise to clients + handling ID collision when using a fallback queue?

In my company, we are using Event Sourcing pattern to implement a storage for all changes to the price of a booking. Across the company, different services might try to append events to a booking ...
JamesBoyZ's user avatar
  • 245
8 votes
10 answers
658 views

Boneheaded exceptions should not be caught. Then how to provide fault tolerance and reliability?

I've always been taught that fatal exceptions (indicating problems that cannot be solved programmaticaly) and boneheaded exceptions (resulting from bugs in my code) should not be caught, should not be ...
gaazkam's user avatar
  • 4,459
7 votes
2 answers
3k views

Is returning true or throwing an exception good or bad code practice?

I am focusing on learning better design and wondered if this code is good or an anti-pattern? The function Validate() returns true if the data is correct, else it will throw an exception with a ...
proeng's user avatar
  • 103
4 votes
3 answers
4k views

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 ...
Konrad's user avatar
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27 votes
14 answers
9k views

What's the logic behind the design of exceptions?

I'm writing an application in C#. I'm facing an InvalidConstraintException, but from that Exception, I seem not to be able to access the Constraint, causing the Exception. That specific question is ...
Dominique's user avatar
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0 votes
2 answers
157 views

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 ...
germanshedder's user avatar
0 votes
2 answers
277 views

Is it bad to use checked exceptions as API response?

Consider the following code: public class User { private String password; public void changePassword( String oldPassword, String newPassword) throws ...
George Z.'s user avatar
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6 votes
3 answers
1k views

How to simplify exception handling for library users?

Suppose of having a library exposing the following piece of functionality: public static class AwesomeHelpers { public static async Task<int> ComputeSomethingImportAsync(CalculationInputs ...
Enrico Massone's user avatar
0 votes
1 answer
169 views

Exception handling with failure atomicity in desktop applications

When it comes to exception handling, there are many guidelines and best practices on the web. On of them is to throw early, catch late, or even Don't Catch. So when facing an exception, the current ...
mperktold's user avatar
  • 151
2 votes
2 answers
2k views

Validations and throwing exceptions in DDD?

I have a question regarding validations and exceptions in DDD. I have a ValueObject say, PasswordText which takes a string argument in it's constructor. Checks if the string matches the password ...
honey_ramgarhia's user avatar
4 votes
3 answers
7k views

Should try-catch blocks be used when calling functions that already have them?

In JavaScript, if I have try catch blocks in a function that is meant to be called from another function, should I also put them in the calling function or just let the called functions handle them. ...
Russ Bain's user avatar
  • 143
1 vote
2 answers
286 views

Best Practice: Unit test coverage vs. in-method sanity checks [duplicate]

I have a code-coverage requirement of of a certain percentage, and face the following tradeoff: Should I sacrifice in-method sanity checks and error handling for ease of (unit-) testability? Lets ...
MPIchael's user avatar
  • 249
1 vote
2 answers
646 views

Catch "foreign" exception in adapter and convert them in own business exception is a good practice?

I am currently thinking about some design choices regarding exception handling. My current architecture looks a little like this: You can see that I have a UI where a try-catch middleware is cathing ...
David Mason's user avatar
1 vote
2 answers
132 views

Are the exceptions used in BeanValidation/JAX-RS's ExceptionMapper an anti pattern?

I am reading a lot about patterns and code structure and something that bothers me is BeanValidation's way to handle errors. I like Java and think that BeanValidation is easy to use, but it seems to ...
Apollo's user avatar
  • 121
-2 votes
4 answers
123 views

Is this a good approach to stop an API function and return relevant error message?

I am writing an API function using DRF where I want the API execution to stop if it fails in any of the steps and return an appropriate response. So I created a custom exception which takes an error ...
gowthz's user avatar
  • 111
0 votes
3 answers
616 views

Confusion about basic exception handling and rethrowing exception [duplicate]

I came across this question and super confused about rethrowing concept in the following example: try { // code that may throw exceptions } catch(Exception ex) { // add error logging ...
pnatk's user avatar
  • 133
-1 votes
2 answers
790 views

Where to place exception handling while using Decorator design pattern

How to design a service layer structure that will be resistant to exceptions. Let's say I have a simple OrderService service, this service performs basic operations - saving an order. public interface ...
jnemecz's user avatar
  • 299
1 vote
1 answer
38 views

Failed uploads layer

I am trying to find an optimal way to handle the following scenario: I have an application where there are a lot of file uploads on a certain endpoint, but the validation is rather strict as per the ...
Daniel Pop's user avatar
3 votes
1 answer
1k views

Handling same exception thrown by different methods

Is there an idiomatic way to catch an exception when multiple methods may throw?: try: someMethod() # raises OSError someOtherMethod() # raises OSError except OSError: handle() The ...
pstatix's user avatar
  • 1,047
0 votes
3 answers
610 views

What is the proper way to throwing an exception?

I'm currently make a Helper class that can be used by multiple team members. Helper class uses third party API. And I have a question about that handles exceptions in the Helper class. https://docs....
wddfrwd's user avatar
  • 61
2 votes
4 answers
565 views

Is it common practice to declare exceptions in a library that won't be thrown or caught anywhere within that library?

I have a very basic library that serves the purpose of collecting some useful but simple pieces of code. Like for example a Percent struct or functions like ToDegrees() and ToRadians(), just to give ...
Stelios Adamantidis's user avatar
31 votes
10 answers
9k views

What is a good approach to handling exceptions?

I have trouble reconciling "best practices" and real-world approaches to handling exceptions. In my day to day routine, I find myself running into the following examples: try: ...
Jakov's user avatar
  • 465
1 vote
4 answers
312 views

Displaying exceptions

I read/watch about Uncle Bob's clean code and when he talks about exceptions he suggested to have a well named exception over a description which make perfect sense for the programmer, for decoupling ...
Olivier D's user avatar
66 votes
9 answers
8k views

Why do "checked exceptions", i.e., "value-or-error return values", work well in Rust and Go but not in Java?

Java has "checked exceptions", which force the caller of the method to either handle an exception or to rethrow it, e.g. // requires ParseException to be handled or rethrown int i = ...
Heinzi's user avatar
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