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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71
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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. ...
83
votes
16answers
25k views

Should one check for null if he does not expect null?

Last week, we had a heated argument about handling nulls in our application's service layer. The question is in the .NET context, but it will be the same in Java and many other technologies. The ...
17
votes
5answers
8k views

null pointers vs. Null Object Pattern

Attribution: This grew out of a related P.SE question My background is in C / C++, but I have worked a fair amount in Java and am currently coding C#. Because of my C background, checking passed and ...
24
votes
15answers
15k views

Arguments for or against using Try/Catch as logical operators [closed]

I just discovered some lovely code in our companies app that uses Try-Catch blocks as logical operators. Meaning, "do some code, if that throws this error, do this code, but if that throws this error ...
32
votes
4answers
2k views

How much information about an error should be shown to the user?

Applications can always throw errors. If such an error occurs, the user should be notified, because what he asked the application to do has not succeeded. However, how much information should the ...
85
votes
12answers
7k views

How big does my project need to be for me to unit test it? [closed]

I assume that my project is decoupled enough to allow for unit testing. But how big, exactly, in terms of clases and functions does my project need to be to make unit testing worthwhile? We all make ...
84
votes
14answers
45k views

Why is 0 false?

This question may sound dumb, but why does 0 evaluates to false and any other [integer] value to true is most of programming languages? String comparison Since the question seems a little bit too ...
5
votes
5answers
3k views

How should I handle exception that *should* never be thrown? [duplicate]

What is the best way to handle errors that shouldn't ever happen? My current way to do this is to throw an exception if the 'thing that shouldn't happen' does happen, like so: /* * Restoring from a ...
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 ...
10
votes
3answers
1k views

Recommend a design pattern/approach to exposing/tolerating/recovering from system errors, Exception handling (e.g.s in Java, C++, Perl, PHP)

Can you recommend a design pattern/approach to exposing/tolerating/recovering from system errors, Exception handling (Java, C++, Perl, PHP)? Some errors need to be reported. Some errors can be ...
35
votes
7answers
7k views

Should a stack trace be in the error message presented to the user?

I've got a bit of an argument at my workplace and I'm trying to figure out who is right, and what is the right thing to do. Context: an intranet web application that our customers use for accounting ...
100
votes
11answers
19k views

The modern way to perform error handling…

I've been pondering this problem for a while now and find myself continually finding caveats and contradictions, so I'm hoping someone can produce a conclusion to the following: Favour exceptions ...
41
votes
10answers
5k views

Why are exceptions considered better than explicit error testing? [duplicate]

Possible Duplicate: Defensive Programming vs Exception Handling? if/else statements or exceptions I often come across heated blog posts where the author uses the argument: "exceptions vs ...
8
votes
2answers
1k views

How to Implement Error Handling [closed]

Even though I've programmed on a professional level for some years I still do not fully understand error handling. Although my applications work fine, the error handling isn't implemented at a ...
10
votes
3answers
2k views

Exceptions or Error codes

We are building a web service(SOAP, .Net) which would be talking to (mostly) native clients (windows, C++) and we are wondering what is the best way to communicate errors to the client (e.g. ...
6
votes
2answers
719 views

Designing exception classes

I'm coding a small library and I'm having some trouble with designing the exception handling. I must say that I am (still) confused by this feature of the C++ language and I tried to read as much as ...
5
votes
2answers
265 views

Is error suppression acceptable in role of logic mechanism?

This came up in code review at work in context of PHP and @ operator. However I want to try keep this in more generic form, since few question about it I found on SO got bogged down in technical ...
4
votes
2answers
736 views

Is there a term for the error-handling anti-pattern of discarding all available info and just returning failure?

From time to time (unfortunately way too often) I have to fix code such as this: // C++ code bool anyOldFunction(Param p) { try { ... if(some_condition_here) { handleErrorX(); return ...
1
vote
2answers
975 views

How should I provide detailed information about an error, if not through HTTP status codes?

This question comes from here. I believe it deserves to be on its own instead of being lost in a long question with multiple points. I'm building an API and find myself limited by HTTP error codes. ...
1
vote
2answers
2k views

Nested Try Catch Error Handling with Log Files?

Best practice question for error handling in C#? In our system we will be writing out files, and with each file they will have a corresponding error file. The error file will get written every time ...
0
votes
1answer
221 views

How to handle coding errors in my PHP AJAX code?

How do I handle coding errors in my PHP which has no GUI, only an API? I am concerned that I might never know that there are any. Note that only I will develop the client side. This is not a public ...
0
votes
1answer
104 views

Dealing with error in data - Idempotent approach

A prior question had an answer that interested me from a design perspective. I work in geospatial data and occasionally have to deal with voids when I read these binary files into my product. What is ...