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 ...

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2
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1answer
113 views

Where do you print IO error messages from in a console app?

I'm writing a simple console app to rename a bunch of files/folders, and I want to design this console app to be as modular as possible. The console app is as simple as it gets: Ask the user what ...
2
votes
3answers
240 views

Why do assertions in Java need to get enabled?

I really like the concept of assertions in Java in the way how to use them. It's much easier than to write an if and then throw an Exception/Error. But the thing I don't understand is, why do they ...
2
votes
1answer
127 views

What are the limitations of Java exception approach to errors?

Please ignore performance issues, I am interesting in data flow, safety, modelling, reasoning. I wonder what are the limitations of exception approach to error reporting implemented like in Java ...
11
votes
5answers
378 views

Is indiscriminately catching exceptions (Pokemon exception handling) ever acceptable? [duplicate]

Normally, I don't anticipate exceptions and if I get them, its something that I can't fix in my code - bad user input or connectivity issues with the database. But errors do occur so at the very ...
0
votes
3answers
76 views

Preventing information leakage while returning an error message

Say my website contains 2 functions: Allow a user to change their own password Allow an administrator to change a user's password (the user must change again before they login) Now let's say that ...
0
votes
0answers
21 views

Handling error with Promise

I'm writing a small application in TypeScript that has to do some asynchronous operation and I'm doing it with Promise and async/await sugar. But my problem do not rely on the particular language or ...
7
votes
2answers
126 views

How to work with/around an API that does not return errors?

I am currently working on a project which requires data fetching from a 3rd party closed API (over SOAP). Currently I'm in a situation where I have to do argument and data validation inside our ...
1
vote
1answer
93 views

Standalone library for error logging?

Background Here is how I currently log any exceptions that occur in my code: Pass each object instance the path to a file where I want all of the logging to happen. Each of the objects have their ...
2
votes
2answers
88 views

Java EE exceptions for validation and APMs

In my current work, we have some Java EE applications and we use exceptions and exception mappers to deal with user errors, i.e. that can't be dealt with in the frontend. We usually reply with a 400, ...
2
votes
1answer
25 views

Handling and reporting errors consistently

Errors can come from many different sources - third-party services, libraries, environment, etc. When an error prevents a user from performing their desired action, these diverse errors should be ...
1
vote
1answer
84 views

Recieving errors without engaging in excessive communication when using sockets

I'm currently writing a program that communicates with a server over TCP sockets. I originally planned for the communication to include a message confirming successful communication at the end of ...
1
vote
1answer
74 views

Error handlers inside Promise.all

I'm looking at this piece of code and whilst it works, it feels wrong to me. I'm wondering if I am looking at an anti-pattern? The code starts with two promises, getAccounts and getTransactions. On ...
4
votes
1answer
119 views

Overflow Exception Checking Problem

Background I have to call a method that needs to return a signed integer (see code block below) after converting from an unsigned integer. The reason for this is that I have to do bit-wise math that ...
-2
votes
1answer
96 views

Investigating in a highly distributed environment [closed]

I was asked this by an interviewer today and unfortunately he wouldn't share the kind of answer he was looking for so I'm hoping maybe the community can help. Say you're an engineer at company X and ...
35
votes
7answers
4k views

Arguments against error suppression

I've found a piece of code like this in one of our projects: SomeClass QueryServer(string args) { try { return SomeClass.Parse(_server.Query(args)); } ...
53
votes
5answers
7k views

Will a computer attempt to divide by zero?

We all know 0/0 is Undefined and returns an error if I were to put it into a calculator, and if I were to create a program (in C at least) the OS would terminate it when I try to divide by zero. But ...
2
votes
2answers
314 views

Error handling in C++

So, in the recent weeks I delved into C++ programming, and I programmed some things in SDL. Doing so, you always have to deal with a lot of (ugly) C++ code, which looks more like C than C++. One thing ...
1
vote
2answers
98 views

Load to list in one loop and then process list in another or do it all at once

I have a dataset full of rows that I must initialize into myclass and then process. I am currently looping through each row in the dataset, initializing a new instance of myclass, then adding that ...
71
votes
12answers
8k views

I've been told that Exceptions should only be used in exceptional cases. How do I know if my case is exceptional?

My specific case here is that the user can pass in a string into the application, the application parses it and assigns it to structured objects. Sometimes the user may type in something invalid. ...
0
votes
2answers
99 views

Should I log errors in the function they occur? or pass them back and log them when control returns?

One of the things I love about Go is how they encourage passing errors as return values, but when it comes to logging what is the most maintainable solution: passing the error as far back down the ...
2
votes
5answers
344 views

Handling null-references in C# logic

Let's say I have an API method with can be used to calculate the sum of all orders made by a specific customer: Amount CalculateOrderSum(int customerId) { // Perform authentication to make sure ...
30
votes
9answers
2k views

Is possible to write too many asserts?

I am a big fan of writing assert checks in C++ code as a way to catch cases during development that cannot possibly happen but do happen because of logic bugs in my program. This is a good practice in ...
8
votes
2answers
241 views

Do we need to validate entire module usage or just arguments of public methods?

I've heard that it is recommended to validate arguments of public methods: Should one check for null if he does not expect null? Should a method validate its parameters? MSDN - CA1062: Validate ...
3
votes
3answers
169 views

Are exceptions only for handling errors?

I have a script that throws exceptions when something goes wrong. However, for the purposes of testing I also want to capture specific points although I'm not sure whether they would be deemed errors ...
8
votes
2answers
426 views

Is the strong exception safety guarantee with a pass-by-value argument which can throw on destruction possible?

Suppose you have a type with a throwing destructor, and a function receiving it by value. Can that operation ever provide anything better than the basic exception guarantee? Or formulated differently, ...
4
votes
1answer
135 views

How to approach syntax errors when developing a lexical analyser?

I am writing an interpreted domain-specific language for my application. Each statement is parsed and executed as soon as lexical analyser decides that the end of statement is reached. It's handling ...
26
votes
3answers
1k views

Should I use HTTP status codes to describe application level events

Several servers I have dealt with will return HTTP 200 for requests that the client ought to consider a failure, with something like 'success : false' in the body. This does not seem like a proper ...
3
votes
1answer
30 views

How to design error monitoring for batch jobs with multiple and diverse steps?

I'm working on a software to integrate an e-commerce store and the company ERP. All the integration steps are run as a unique batch job, every 5 minutes. Things are working under production, but I'm ...
3
votes
1answer
245 views

Best practice for angular service return value

I have a number of angular services (e.g. a user service) which make various HTTP calls and I'm wondering what the best practice would be for handling errors. For example, I could do: function ...
-3
votes
2answers
212 views

Why ever use exception throw (in C#) except for Class Library development? [duplicate]

Why would I ever throw exceptions in code? (except for one specific scenario where I am developing a class library which the consumers of it, will not want / be able to change). To be more specific, ...
51
votes
8answers
21k views

Return magic value, throw exception or return false on failure?

I sometimes end up having to write a method or property for a class library for which it is not exceptional to have no real answer, but a failure. Something cannot be determined, is not available, not ...
53
votes
7answers
4k views

Should one check for every little error in C? [duplicate]

As a good programmer one should write robust codes that will handle every single outcome of his program. However, almost all functions from the C library will return 0 or -1 or NULL when there's an ...
41
votes
6answers
43k views

try-catch in javascript… isn't it a good practice?

There is a provision for try-catch block in javascript. While in java or any other language it is mandatory to have error handling, I don't see anybody using them in javascript for greater extent. Isn'...
1
vote
1answer
153 views

How often should I use try/catch statements? [duplicate]

Everything I've read says that they should be used when something that simply "shouldn't happen" does happen. But the thing is, there's a lot of things that could go wrong. For example, if I'm ...
5
votes
2answers
867 views

Should I always return an error code from C functions?

I have the following code in many places in a large application: if (datastruct.data_ok && cur_time > datastruct.start_time && cur_time < datastruct.end_time) { ...
4
votes
3answers
364 views

Handling and managing error codes [closed]

I'm looking for examples of creating, handling and managing error numbers/codes. To understand what I'm takling about, let's take example scenario: (EU - end user, IT - it helpdesk) EU: - (calls IT) ...
0
votes
0answers
99 views

Test for PHP Errors using Browser Emulator (Mink)

I want to know the most robust way of checking for PHP error messages when running automated tests that interact with a PHP application via a browser emulator. The reason is: I use Behat, Mink and ...
0
votes
0answers
63 views

Checking for null pointers or allowing a math library to segfault?

I've been going through the GNU GSL design document and came across this interesting line in the Test suites section: N.B. Don't bother to test for null pointers -- it's sufficient for the library ...
4
votes
1answer
189 views

Should a web service return an error message if it receives unknown parameters?

I have a web service which allows to retrieve users: http://example.com/users. It returns a list of users. That service accepts a number of parameters (age, gender) to select which users to retrieve. ...
4
votes
5answers
2k views

Checking array size in C/C++ to avoid segmentation faults

So it's well known that C does not have any array bounds checking when accessing memory. Nowadays, if you call myArray[7] when you initialised it as int myArray[3], your program will get a segfault ...
1
vote
1answer
93 views

Should I put stack trace in error files and halt my app with user friendly error [closed]

In my earlier project I wrote an app that is used in-house. My usual practice is to capture errors/exceptions from different classes and threads and put them in different log files corresponding to ...
3
votes
3answers
121 views

Is this a valid situation for returning rather than throwing an exception?

This is not something I would ever normally do, but I have a situation where some existing legacy code is being reused in a new application. The code is shared and needs to be used by both the legacy ...
0
votes
1answer
45 views

Error handling in math library functions

When writing a library function, such as double getAvg(double[]); how should one handle the empty array? (Note that, mathematically speaking the avg of an empty set is undefined.)
4
votes
2answers
453 views

Rust-style error handling in C++

I've been reading some articles on how Rust does error handling using the Result<T, E> type and to me it seems like a hybrid best-of-both-worlds (exceptions and return codes) solution which can ...
2
votes
1answer
41 views

Storing exception information as a member variable for query later, bad practice? [duplicate]

I looking at the best way to handle exceptions, the answer to this question may be to handle the exception in a different place or to not handle to exception at all but to control the flow of the code....
7
votes
2answers
350 views

What's the best way to handle Windows API errors in response to system messages or when I have nowhere to return them to?

This is going to be a really stupid question and I hope it's fine for Stack Exchange at all, let alone just this part of it... Right now, my custom Table control uses panic() functions that print an ...
3
votes
3answers
578 views

How should my web application handle common errors such as incorrect password, session timeout, etc.?

How should my web application handle common errors such as incorrect password, session timeout, etc.? I have a class called Hotmail that contains various method such as login, logout etc. To ...
2
votes
4answers
415 views

Design Pattern for retry and error handling

I'm trying to find a good design pattern, or perhaps series of patterns, for injecting error handling and retry handling when getting data from a webservice. For instance, I have: do { //get the ...
4
votes
2answers
211 views

Strategies to analyze collected exceptions

We want to add error feedback to our application. I had a look at existing solutions (e.g. raygun.io), but these work "in the cloud", which is a no-go for us: most installations of our application ...
7
votes
4answers
1k views

Best Practice: Should error messages be handled by the API or by the App?

I am designing an application that interacts with a RESTful API. When returning error messages like Unable to sign up user Should the error message be generated by the app? or by the API? I am ...