Questions tagged [exceptions]
An exception is an occurrence in an application process that requires deviation from the program's normal flow.
642 questions
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Is it good practice to check exception messages in unit tests? [duplicate]
Imagine I have a function like this (written in Java):
void sayHello(String firstName, String lastName) {
if (firstName == null) {
throw new IllegalArgumentException("first name is ...
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6
answers
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What's a good way to use exceptions in a C++ project?
The basics: what I know
I understand the basics of exceptions:
If a function cannot perform its assigned task, it can signal it by throwing an exception,
When writing a function, one must make sure ...
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answers
502
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Control flow and communication with two separate frontends (maybe with exceptions)?
I am trying to write a backend for use with a completely text based UI for one shot operations (eg. python scriptname arg, executes that argument and exits) and a GUI using the curses library for some ...
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answers
546
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How to handle checked exceptions on interface contract in Java
I am starting a project in Java and ran into the following situation. The application requires a persistence layer for a certain document type. This could be a MySql database, an AWS Dynamo DB ...
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Combining multiple input validations into one exception
In order to make sure methods fail fast under invalid arguments, I usually do validation at the start of a method. If I'm verifying multiple predicates, this leads to a few lines of checkNotNull or ...
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The best way to handle exceptions?
I have the following method, which needs to return a List, but exceptions might occur along the way, and I don't want to handle them in my application, mainly because I don't even know how to handle ...
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answers
729
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Explain why it's bad to use a middleware to coat error messages as exceptions
We manage a backend application behind a FastAPI REST controller with multiple endpoints.
A member of our team decided to use a middleware on the application which parses the body of the response for ...
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7
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Exceptions and the Liskov Substitution Principle
Consider the following scenario.
I have an interface IService:
public interface IService
{
void DoSomething();
}
with an implementation:
public class Implementation : IService
{
// This might ...
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answers
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When to write a custom exception handler?
A long time ago I was in a class and the professor had us write individual exception handlers for every possible error.
This seems almost impossible to do when developing large pieces of software ...
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5
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253
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End method in normal flow versus exception flow [duplicate]
Consider the two following examples:
public Something fetchSomething(String key) {
if(somethingsMap.containsKey(key)) {
return somethingsMap.get(key);
}
throw new ...
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1
answer
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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 ...
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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
...
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1
answer
305
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 ...
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1
answer
140
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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 ...
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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 ...
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3
answers
911
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 ...
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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". ...
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1
answer
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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 ...
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votes
1
answer
100
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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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3
answers
974
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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 ...
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answers
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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 ...
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6
answers
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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 ...
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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:
...
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1
answer
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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:
...
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4
answers
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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 ...
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3
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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 ...
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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 ...
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2
answers
418
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 ...
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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....
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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) ...
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6
answers
531
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
{
...
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votes
14
answers
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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 ...
0
votes
3
answers
203
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 ...
0
votes
3
answers
1k
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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 ...
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vote
2
answers
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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 ...
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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 ...
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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 ...
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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 ...
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votes
3
answers
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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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votes
14
answers
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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 ...
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173
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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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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 ...
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votes
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answers
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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 ...
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votes
1
answer
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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 ...
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answers
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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 ...
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3
answers
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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.
...
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answers
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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 ...
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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 ...
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2
answers
163
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 ...
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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 ...
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