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

learn more… | top users | synonyms (1)

5
votes
7answers
2k views

Why have many programmers moved to using exception handling for input or output? [closed]

Why have many programmers moved to using exception handling for input or output? For these programmers, what is the motivation behind this decision?
2
votes
3answers
191 views

Extended usage of an exception

I'm in the process of building a routing system for learning purposes and have encountered an issue which I think is a bit in the grey area of best practices. Can you guys help me decide if this is ...
-1
votes
1answer
285 views

Should i avoid FaultException for Custom Validation Error messages to client [duplicate]

We are as a team working on a project which currently using WCF as in between client and server. All business rules are written on managers classes which are used by service so its means no ...
0
votes
1answer
99 views

Pass by value result with exceptions [closed]

I have a doubt with the pass-by-value-result method. As far as I understood, it passess the value of the parameter to the function, and then get the result as the function ends. But what happens with ...
187
votes
9answers
14k views

Why do many exception messages not contain useful details?

It seems there is a certain amount of agreement that exception messages should contain useful details. Why is it that many common exceptions from system components do not contain useful details? A ...
3
votes
3answers
490 views

No exceptions C++ and partially constructed objects

Looking over Joint Strike Fighter Air Vehicle C++ Coding Standard, rule AV 73 states something on the lines: Default c++ constructors should be avoided if that means leaving object in a partially ...
7
votes
5answers
465 views

Rethrow the same exception to provide more info

Is it a good practice to rethrow the same exception to provide more specific information? For example: var sitemap = "a string containing an XML document"; try { // throw InvalidXmlException if ...
5
votes
1answer
176 views

Should I always throw the most specific or should I try to generalize exception types?

Say you normally have FooException. /** * @throw FooException If Foo is invalid for searching. */ public bool exists(Foo a) But at some point you need to have two more specific exceptions for Foo....
0
votes
4answers
82 views

What's the best way to handle slightly different exceptions?

My code right now looks something like this: void throw_illegal_part_of_input_exception(char c) {} void throw_invalid_input_length_exception(int position, int length) {} void ...
1
vote
1answer
134 views

Using exceptions as regular objects [duplicate]

I have views that handle different errors in my application. For example error 404, 403 and such, giving my errors a more user-friendly presentation. By assumption, they get passed in an exception, so ...
0
votes
1answer
310 views

proper exception handling (throwing/message) dll libary

I just wrote a dll library using vb.net. while testing, i got an error which i did not initially use a try-catch block. The code is Try 'The first four bytes are for the Command ...
0
votes
2answers
105 views

How do I find out what type of exception I am supposed to raise?

I suppose this question is valid for any programming language that can handle (or at least throw) an exception. However I will stick to Python as an example. The top 2 answers to the following ...
3
votes
1answer
105 views

How to handle Django get-single-instance-in-view pattern?

A lot of my Django views start a little bit like this: try: # here request.POST could also be request.GET or a captured URL parameter MyModel.objects.get(user = request.user, some_attr = int(...
0
votes
2answers
165 views

Catch unusual exceptions on production code for web apps

Lets say I have a web app, and despite my best testing efforts, several of the many thousands of people who uses it will find some way to generate an exception. Sure, I have error handling code for my ...
5
votes
1answer
521 views

When should I subclass an exception in Python?

In my code there are about seven places where I raise an exception. All of these exceptions are treated the same: print an error to log file, return software state to default and exit. During code ...
0
votes
1answer
196 views

Is there are any common pattern/practice to handle exception list (Java)? [closed]

Suppose I've got a sophisticated parser for something. And a I don't want Throw Early/Fail-Fast strategy. If I've got multiple problems, i want to have list of exceptions in my log file because I want ...
5
votes
2answers
945 views

When to create a custom exception in C#

I'm writing a class to interface with a simple hardware device over a COM port. The device can configured to use various modes, so my class has a SetOperatingMode function, that takes in an enum of ...
2
votes
2answers
370 views

How to make sure that the destructor cannot throw an exception?

I know that we can specify the compiler that a function is not throwing an exception by using noexcept specifier but noxecept functions can still throw exceptions . So, how to prevent destructor from ...
0
votes
1answer
88 views

Return values and exceptions [closed]

I wrote simple function that returns a string depending on which condition is TRUE. Here is my code: private String getMyString() { if(!mStrigMember.isEmpty()) { return mStrigMember; }...
5
votes
2answers
554 views

Exception versus return code in DAO pattern

After reading a lot about the abusive use of exceptions in Java and how you should let an exception bubble up through the different layers of an application, I've come to a point where I don't know ...
4
votes
2answers
459 views

Is checking that a property doesn't throw an exception a valid unit test?

I'm writing tests for the following class: public class Foo : INotifyPropertyChanged { private int _failCount; private int _totalCount; public double FailRate { get { double ...
1
vote
2answers
309 views

Smells in exception handling: how to separate between public and internal exceptions?

During the development of a small web API, we decided to separate internal exceptions from public exceptions. Public exceptions are HTTP exceptions, that translate into HTTP responses with proper ...
0
votes
5answers
371 views

Handling DomainExceptions using REST endpoint

Suppose I'm doing some DDD. Now, I have a microservice reflecting a bounded context/a part of a bounded context. Now, suppose there is a REST endpoint: '/somedomainmodel/someaction' My API user is ...
31
votes
8answers
5k views

Is throwing an exception an anti-pattern here?

I just had a discussion over a design choice after a code review. I wonder what your opinions are. There's this Preferences class, which is a bucket for key-value pairs. Null values are legal (that'...
5
votes
5answers
531 views

How to handle exceptions that get absorbed by a 3rd party library?

I'm currently having an issue with a 3rd party control library provider. They have an exception occulting culture that gets in the way of my general fail-fast approach when developing software. An ...
0
votes
3answers
998 views

Convention for logging within nested try catch blocks

I've looked at this question but it doesn't really help solve my dilemma. System 1 calls system 2 within a try catch, the method in system 2 has it's own try catch, which sadly handles an exception ...
0
votes
1answer
62 views

Exception handling scope when dealing with nested exceptions

Assume you have one object that has two methods which both throw different exceptions. These methods must be used together. For instance: SqlCon{ static SqlCon connect(string user, string pass) ...
0
votes
1answer
258 views

How shall I handle event loop exceptions?

What is the best practice for handling exceptions thrown from event handlers/listeners in a event loop? For example: class EventLoop { public: void start(); //create a thread which calls run(); ...
23
votes
11answers
6k views

Is the 'finally' portion of a 'try … catch … finally' construct even necessary?

Some languages (such as C++ and early versions of PHP) don't support the finally part of a try ... catch ... finally construct. Is finally ever necessary? Because the code in it always runs, why ...
5
votes
1answer
88 views

Should I use exceptions to control the range of parameters in Python?

For example for the following method signature: def genClusters(n_clusters, n_nodes, cluster_distribution): n_clusters should be an integer of more than 1. n_nodes should be an integer of more ...
52
votes
9answers
6k views

Throw exception or let code fail

I am wondering if there are any pros and cons against this style: private void LoadMaterial(string name) { if (_Materials.ContainsKey(name)) { throw new ArgumentException("The ...
1
vote
2answers
194 views

Is it a Good Practice to Catch All Exception? [duplicate]

The snippet below (in java) gives an example of my question. try { // code implementation here } } catch (Exception ex) { } ...
2
votes
1answer
239 views

How to differentiate between exceptions coming from system and business logic?

I would like to differentiate between exceptions coming from business logic like requested database record does not exist attempt to store invalid business data (validation failed) provided CSV file ...
3
votes
2answers
202 views

How to deal with historic exception specifications in maintained C++ code

Today, I discovered a few exception specifications in legacy code I've to maintain, when Cppcheck 1.68 ([Inconclusive] but correctly) pointed out that the specified exceptions are not handled in ...
1
vote
2answers
272 views

Recovering a process after illegal instruction exception

Is it possible in theory to recover after a process is mistakenly pointed-out to read from a wrong memory address, rather than terminating it? Let say an error while working with registers lead the ...
0
votes
1answer
194 views

Where would be better to handle an exception?

Imagine I have the following DAO method: public Employee getEmployeeById(Integer id){ NamedParameterJdbcTemplate jdbcTemplate = new NamedParameterJdbcTemplate(getJdbcTemplate()); String sql = ...
3
votes
2answers
442 views

Scala and exception handling [closed]

I am curious why exception handling is a topic often ignored in Scala. Is it the goal of the language (or the style) to not rely on exception handling except for external input/code? I was hoping ...
1
vote
2answers
407 views

How to Keep Track of Thread Safe Code in a mostly Thread Unsafe Legacy Rich C++ Code Base

For large legacy C++ code bases, notions like Herb Sutter's "const means threadsafe" don't seem to help much, because there can be an overwhelming amount of code in const functions which are modifying ...
1
vote
3answers
186 views

Coerce bad input or always crash early

The general consensus seems to favor the Crash Early approach, the most reputable source being the acclaimed Pragmatic Programmer book. And while I understand and agree with the advice in many ...
0
votes
1answer
184 views

Replacing Throwing Exceptions with Notification in Validations

Martin Fowler recommends replacing exceptions with notifications when dealing with validations. Essentially, instead of throwing an exception, you append error messages to a Notification object that ...