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

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33
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8answers
4k views

Are exceptions an OOP concept?

Having read a post yesterday, I realized I did not know much about the origin of exceptions. Is it an OOP related concept only? I tend to think it is, but again there are database exceptions.
4
votes
1answer
678 views

Why would I use Control.Exception in Haskell?

I'm trying to really master Haskell error handling, and I've gotten to the point where I don't understand why I would use Control.Exception instead of Control.Monad.Error. The way I can see it, I can ...
2
votes
1answer
132 views

Reporting and handling asynchronous process errors to a client

I have a product with two separate applications. The core of the product lives in the database (oracle) and runs according to a schedule. The other is a client application (currently ASP.NET MVC3) ...
2
votes
1answer
107 views

Data decoding initialization/Constructor error handling

I have a set of loadable data decoders for a specific type of data and a stream to read containing data. Now I want the program to select the correct decoder in a reliable way so I want to use a ...
4
votes
4answers
965 views

Having error codes option in C++ library for performance

I have written an open source and cross-platform C++ File Library which have exception and error codes. Exceptions can be disabled when the program is running. In that case, the user have to check the ...
3
votes
2answers
568 views

Best way to throw exception and avoid code duplication

I am currently writing code and want to make sure all the params that get passed to a function/method are valid. Since I am writing in PHP I don't have access to all the facilities of other languages ...
9
votes
3answers
3k views

Decision for Unchecked Exceptions in Scala

As a java programmer, I have always been critical of Unchecked Exceptions. Mostly programmers use it as an en-route to coding easiness only to create trouble later. Also the programs (though untidy) ...
8
votes
5answers
1k views

“Programming error” exceptions - Is my approach sound?

I am currently trying to improve my use of exceptions, and found the important distinction between exceptions that signify programming errors (e.g. someone passed null as argument, or called a method ...
1
vote
1answer
597 views

Central Exception Handler

Recently I've been thinking about a general ExceptionHandler, that I could initialize once in my app context and inject it everywhere. The idea that it will have quite simple interface with just ...
36
votes
4answers
4k views

Python Forgiveness vs. Permission and Duck Typing

In Python, I often hear that it is better to "beg forgiveness" (exception catching) instead of "ask permission" (type/condition checking). In regards to enforcing duck typing in Python, is this try: ...
6
votes
3answers
2k views

Exception Handling Frequency/Log Detail

I am working on a fairly complex .NET application that interacts with another application. Many single-line statements are possible culprits for throwing an Exception and there is often nothing I can ...
4
votes
3answers
127 views

Designing exceptions for conversion failures

Suppose there are some methods to convert from "X" to "Y" and vice versa; the conversion may fail in some cases, and exceptions are used to signal conversion errors in those cases. Which would be the ...
9
votes
2answers
380 views

Use an else after exception (or not)

Consider this bit of code: if (x == 1) { throw "no good; aborting" ; } [... more code ...] Now consider this code: if (x == 1) { throw "no good; aborting" ; } else { [... more code ...] } ...
2
votes
4answers
319 views

How to initialize object which may be used in catch clause?

I've seen this sort of pattern in code before: //pseudo C# code var exInfo = null; //Line A try { var p = SomeProperty; //Line B exInfo = new ExceptionMessage("The property was " + p); ...
6
votes
2answers
884 views

Where should I handle fatal exceptions

Suppose I have a controller that loads a file and hands it over to the processing. Should I handle the exception in the file loader and return Null if something is wrong, or should I throw the ...
1
vote
4answers
178 views

What is the best way to go about testing that we handle failures appropriately?

we're working on error handling in an application. We try to have fairly good automated test coverage. One big problem though is that we don't really know of a way to test some of our error handling. ...
6
votes
3answers
4k views

Best method in PHP for the Error Handling ? Convert all PHP errors (warnings notices etc) to exceptions?

What is the best method in PHP for the Error Handling ? is there a way in PHP to Convert all PHP errors (warnings notices etc) to exceptions ? what the best way/practise to error handling ? ...
41
votes
10answers
4k 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 ...
36
votes
11answers
19k views

Is catching general exceptions really a bad thing?

I typically agree with most code analysis warnings, and I try to adhere to them. However, I'm having a harder time with this one: CA1031: Do not catch general exception types I understand the ...
39
votes
12answers
3k views

Why are errors named as “Exception” but not as “Error” in programming languages?

I've been thinking about that for quite a while actually. I am not a native english speaker myself but still I have years of programming experience and I always asked me this. Why is it named as ...
0
votes
1answer
2k views

Generic way of handling exceptions in windows phone? [closed]

I mean what are some of the ways other programmers deal with exception for example, when an error occurs when accessing a web service for say. If an example cant be given for windows phone, give the ...
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
1answer
2k views

Best exception handling practices or recommendations? [closed]

I think the two main problems with my programs are my code structure/organization and my error handling. I'm reading Code Complete 2, but I need something to read for working with potential problems. ...
8
votes
3answers
769 views

Is it a security flaw to log the class and method name when an exception occurs?

I have the following : public class doCheck(){ public void performCheck(){ try { perform all checks...... } catch(Exception e){ ...
2
votes
3answers
2k views

Good practice or service for monitoring unhandled application errors for a small organization

I'm working with multiple software with varying ways of monitoring for errors. When I make software, I usually send email with the stack trace to admins(usually me). Some customer software is ...
6
votes
4answers
461 views

Logging errors caused by exceptions deep in the application

What are best-practices for logging deep within an application's source? Is it bad practice to have multiple event log entries for a single error? For example, let's say that I have an ETL system ...
19
votes
7answers
5k views

Maybe monad vs exceptions

I wonder what are the advantages of Maybe monad over exceptions? It looks like Maybe is just explicit (and rather space-consuming) way of try..catch syntax. update Please note that I'm intentionally ...
1
vote
2answers
1k views

Exception hierarchy design

In my company we are building a webapp containing serveral central services that we design ourselves and then specify as interfaces. I.e. the interfaces are application specific and they are then ...
8
votes
3answers
2k views

“how bad” is unrelated code in try-catch-finally block?

This is a related Q: Is use of finally clause for doing work after return bad style/dangerous? In the referenced Q, the finally code is related to the structure used and the necessity of ...
4
votes
3answers
138 views

Using Exception Emails as a System Status Indicator

I'm working through our bug list today and I'm trying to clear up/fix issues that we commonly receive exception emails for. Although all the exceptions (so far) are handled, some don't actually ...
26
votes
5answers
2k views

Is use of finally clause for doing work after return bad style/dangerous?

As part of writing an Iterator, I found myself writing the following piece of code (stripping error handling) public T next() { try { return next; } finally { next = ...
18
votes
6answers
7k views

Efficient try / catch block usage?

Should catch blocks be used for writing logic i.e. handle flow control etc? Or just for throwing exceptions? Does it effect efficiency or maintainability of code? What are the side effects (if there ...
14
votes
9answers
10k views

if/else statements or exceptions [duplicate]

Possible Duplicate: Defensive Programming vs Exception Handling? I don't know, that this question fit better on this site, or Stack Overflow, but because my question is connected rather to ...
4
votes
2answers
787 views

I have a stacktrace and limit of 250 characters for a bug report

I'm developing an xbox indie game and as a last-resort I have a try...catch encompassing everything. At this point if an exception is raised I can get the user to send me a message through the xbox ...
63
votes
8answers
14k views

Defensive Programming vs Exception Handling?

I'm working through the book "Head First Python" (it's my language to learn this year) and I got to a section where they argue about two code techniques: Defensive coding vs Exception handling. Here ...
1
vote
3answers
103 views

Communicating details of method result?

I have code like this (pseudocode) foreach(Box box in boxes) { if(boxFilter.PassesFilter(box)) { // do something useful } else { Log.Log(format("Box %s was rejected", ...
24
votes
5answers
8k views

should I throw exception from constructor?

I know I can throw exception from constructor in PHP but should I do it? For example, if a parameter's value is not as I expected it. Or should I defer throwing an exception till a method is invoked. ...
51
votes
4answers
28k views

Is it better to use assert or IllegalArgumentException for required method parameters?

In Java, which is more highly recommended, and why? Both types will throw exceptions, so in that regard handling them is the same. assert is slightly shorter, but I'm not sure how much that matters. ...
3
votes
1answer
2k views

Unit testing invalid inputs; ArgumentException vs. Custom Exception

In unit tested code I often have multiple checks on the arguments on any method before the actual "work" of the method is begun: public void DoSomething(string test) { if ...
9
votes
8answers
2k views

Using a try-finally (without catch) vs enum-state validation

I have been reading the advice on this question about how an exception should be dealt with as close to where it is raised as possible. My dilemma on the best practice is whether one should use a ...
2
votes
1answer
801 views

How would you use Redis for Exception Handling?

I was reading this transcript of an interview with a GitHub developer and he was describing how they use Redis: Q: You mentioned using Redis. How do you use that? A: We use Redis for exception ...
8
votes
4answers
2k views

Exceptions as asserts or as errors?

I'm a professional C programmer and a hobbyist Obj-C programmer (OS X). Recently I've been tempted to expand into C++, because of its very rich syntax. So far coding I haven't dealt much with ...
19
votes
3answers
1k views

How to avoid throwing vexing exceptions?

Reading Eric Lippert's article on exceptions was definitely an eye opener on how I should approach exceptions, both as the producer and as the consumer. However, I'm still struggling to define a ...
10
votes
4answers
1k views

Is rethrowing an exception leaking an abstraction?

I have an interface method that states in documentation it will throw a specific type of exception. An implementation of that method uses something that throws an exception. The internal exception ...
9
votes
2answers
466 views

How can I debug exceptions that are not easily reproducible and only occur in a production environment?

I am working on an issue where the exception only occurs in our production environment. I don't have access to these environments, nor do I know what this exception means. Looking at the error ...
61
votes
7answers
65k views

Why use try … finally without a catch clause?

The classical way to program is with try ... catch. When is it appropriate to use try without catch? In Python the following appears legal and can make sense: try: #do work finally: #do ...
31
votes
7answers
67k views

Why doesn't “object reference not set to an instance of an object” tell us which object?

We're launching a system, and we sometimes get the famous exception NullReferenceException with the message Object reference not set to an instance of an object. However, in a method where we have ...
4
votes
2answers
332 views

Nulls in every type and checked exceptions in Java?

I know that null being added to every type in Java is a source of much frustration regarding the language's type system. At the same time I generally hear complaining about checked exceptions - that ...
10
votes
7answers
2k views

Use of NotImplementedException

Is it considered bad practice to throw NotImplementedException for code you haven't written yet? Possibly TODO comments would be considered safer?
3
votes
3answers
5k views

How to store exception messages

How are exception messages commonly stored? for any domain. I'm thinking about this from a maintenance standpoint. if(!Condition1) throw new Exception("Some exception"); if(!Condition2) ...