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

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How to void checked exceptions in Java? [duplicate]

I consider checked exception for a design mistake in the Java language. They lead to leaky abstractions and a lot of clutter in the code. It seems that they force the programmer to handle exceptions ...
0
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2answers
115 views

What should happen when code is reached that shouldn't be, according to business or logic rules? [duplicate]

I am currently writing an application that isn't huge but will be used through-out my company of 200+ people and external customers about projects we are working on (not software projects), but there ...
3
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2answers
224 views

Retried Operation with generic Exception

I am looking for a way to get the logic of retrying an operation in a single method while keeping the exception types of the operation. I.e., the implementation to retry an operation could look like ...
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6answers
3k views

Should you throw an exception if a method's input values are out of range? [duplicate]

Should you throw an exception if a method's input values are out of range? eg //no imaginary numbers public int MySquareRoot(int x) { if (x<0) { throw new ...
-1
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1answer
185 views

How to determine what throws an exception [closed]

Whenever I encounter crashes, the exact type of the exception usually already gives enough info to easily find the culprit. FileNotFoundException will hardly occur while using sockets. Now recently ...
0
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1answer
199 views

Is ok to throw exception in normal code path which eliminate a possible programmer error? [duplicate]

I know that exception should be thrown in exceptional case (e.g. out of memory, programmer error). For these cases, I don't need to worry about performance throwing these exception. But what happen ...
2
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1answer
217 views

Should we encapsulate everything in a try{} block in a Try object?

Why can't I make a class for a Try including what I try and then run that in the try {} block? Why is it impractical? class DBConnectTry extends Try { TryResponse response[] attempt(TryObject ...
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3answers
92 views

Should I use an Exception in a case like this? [duplicate]

I have a Windows service with a fluent interface like this: aRequest = Repository.getRequest() .createProcess() .validate(); Sometimes getRequest() could ...
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3answers
270 views

Exception when logging exception: is it correct to ignore them?

My question is specific to php, but i think it can be useful in other languages. I log into a table all the exception a code can throw: try{ //Some code } catch (Exception $e) { $log = new ...
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5answers
1k 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 ...
3
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1answer
179 views

Should I assert in packages? [duplicate]

I have read a few asserts vs exception questions already; I ask specifically about package visible classes though. When you write a package, the classes marked with "public" are exposed to the ...
-1
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1answer
174 views

Functions returning either “OK” or “error message” instead of procedures

I have joined writing middle-size multi-purpose database application as co-lead. It currently has about 150 tables (and growing) and overall functionality you can imagine as very small ERP. At many ...
14
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1answer
880 views

Is it fine to make a default constructor unusable?

Specifically asking about the default constructor Given that the constructor initializes all the data for an object, if I create a class that can't be used without proper initialization, is it not ...
3
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4answers
336 views

Should exceptions do things other than tell the user something went wrong?

I created a general class that accepts a string when it is constructed, and it spits out that string when a user calls what(). This is all it does; on throw, it returns the initializing string. ...
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1answer
329 views

Separate namespace just for exceptions?

I was doing a code review and came across something odd which I've never seen before. The developer decided to create a sub-namespace just to contain all the assembly's exceptions. I thought I had ...
3
votes
2answers
188 views

Is it an acceptable practice to Get a property, that involve parsing binary, that might throw an exception?

I have a property that is loaded lazily, any time after the ctor is called. It is possible that the binary that my property relies on is invalid. If invalid I might have to throw an exception. ...
11
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2answers
5k views

Is it conventional to raise a NotImplementedError for methods whose implementation is pending, but not planned to be abstract?

I like to raise a NotImplementedError for any method that I want to implement, but where I haven't gotten around to doing it yet. I might already have a partial implementation, but prepend it with ...
1
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1answer
55 views

Partial recovery from an Exception [duplicate]

I have seen Exception Handling blocks that they were throwing the recently caught Exception in the catch block. Something like: } catch ( Exception $e ) { // Do some recovery here ...
3
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1answer
121 views

Exceptions catching clutter code and make it hard to read

When I read well written code that checks to make sure all the input is of the correct format and type, and also catches all the things that possibly could go wrong, I find it difficult to understand ...
19
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2answers
1k views

What is the advantage of wrapping exceptions [duplicate]

It's very common in .NET for an exception to be wrapped in several layers of "outer exceptions" which give marginally more contextual data. For example, in EF if your update fails, you get exceptions ...
3
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2answers
736 views

Doing work in vector's push back

I often use the following syntax: std::vector<foo> vec; vec.push_back( someClass.getFoo(...).modifyAndReturn() ); Considered about exception safety, I quote the standard on vector's push back ...
3
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1answer
162 views

Etymology of “throw an exception“ [closed]

Why do we use the expression “throw an exception“ and not something like “generate“? Where was that term born and in which language?
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3answers
301 views

C API in C++ with RAII, two alternatives to implement error handling (Exceptions)

I have an API written in C, which produces a result by returning a pointer to allocated memory. For using it with C++ (C++11) I've wrapped the function calls in objects, which keep the result in a ...
21
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4answers
3k views

Workaround for Java checked exceptions

I appreciate a lot the new Java 8 features about lambdas and default methods interfaces. Yet, I still get bored with checked exceptions. For instance, if I just want to list all the visible fields of ...
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5answers
293 views

Fail-fast paradigm overheads

Fail-fast seems like a right way since it simplifies bug detection. But it's a harm for performance cause of multiple checking the same thing at several levels of the system. Simple example. There is ...
3
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2answers
131 views

Inform caller or just let them deal with exception?

I'm not sure how to proceed in the following situation. say we have a function as so: def runsATask(codes): myDicts = [helperFunc(code) for code in codes] for item in myDicts: # some ...
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3answers
310 views

Does Exception Handling Violates “Program to Abstraction”? [duplicate]

I am talking based on experience with Java and C#. I do not know if other language have different exception handling implementation. In order to achieve loose coupling, we need our code being ...
2
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1answer
133 views

How to handle when one user deletes the object while the other has it opened in edit mode in a webapp?

I am developing a CRUD type web application. It is a project management system having projects, milestones, tasks, employees etc. Each employee has his/her own account to login and view the system. ...
0
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1answer
243 views

Either Monad and Exceptional Circumstances [duplicate]

I have a function returning an Either such as GetUserFromDb(int id). If the database is offline, should I catch the error in the function and wrap it in a failure / Left case or should I let it ...
9
votes
4answers
1k views

When and how should I use exceptions?

The Setting I often have trouble determining when and how to use exceptions. Let's consider a simple example: suppose I am scraping a webpage, say "http://www.abevigoda.com/", to determine if Abe ...
0
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2answers
473 views

Is storing stack traces in database recommended?

The current system I am working on goes through a set of documents & performs some logic using the metadata of the document. If the metadata of a document is fishy..it throws an exception. The ...
3
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2answers
211 views

Understanding exceptional cases

I've been studying the use of exceptions in various php projects (such as Doctrine and Zend Framework). Exceptions seem to be thrown when unordinary input/state occurs. A perfect example is Doctrine ...
5
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4answers
761 views

What's the reason exceptions are heavily used in managed (C# and Java) languages but not in C++? [closed]

AFAIK, a lot of C++ projects don't allow exceptions and deny them in coding guidelines. I have a lot of reasons, for example, exception is hard to handle correctly if your binary needs to be compiled ...
2
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3answers
508 views

Layering Design Pattern in Java clean code style

As a Java developer, I am developing trying to use the clean code rules. But in my team we are facing a concrete problem: We have a business layer offering a service called "createObject", this ...
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4answers
637 views

What's the difference between the code inside a finally clause and the code located after catch clause?

My java code is just like below: public void check()throws MissingParamException{ ...... } public static void main(){ PrintWriter out = response.getWriter(); try { check(); } ...
3
votes
3answers
255 views

Throwing exception from a property when my object state is invalid [duplicate]

I am aware that for the general case, the answer to "should I throw an exception from a property" is "generally don't, but in some special circumstances it is OK to do so". There is a Microsoft ...
2
votes
3answers
393 views

What code lays behind C++ exception?

In C and C++ you can return a single variable inside a function. Now in the case that variable is returning data, and not an error code, you can use exceptions. But how is that possible? If you data ...
2
votes
1answer
351 views

Why would one transform a checked exception to an unchecked exception? [duplicate]

My buddy told me today that some programmers transform a checked exception (e.g. EJBException, SQLException...) to an unchecked (RuntimeException?) My buddy explained a call stack where if you change ...
1
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2answers
287 views

Java exception redundancy

To what extent should one make exceptions redundant or atomic to a method. For instance, suppose I have a method public void authenticate(String username, String password) that calls private void ...
38
votes
7answers
3k views

Are there legitimate reasons for returning exception objects instead of throwing them?

This question is intended to apply to any OO programming language that supports exception handling; I am using C# for illustrative purposes only. Exceptions are usually intended to be raised when an ...
1
vote
3answers
229 views

Throwing an exception for errors that can be fixed

Say I have a class like this: public class MyObject { public List<string> MyCollection { get; set; } } And a method like this: public void DoSomething(MyObject object) { ...
1
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3answers
210 views

When is a catch clause empty [duplicate]

I saw lots of questions and explanations regarding empty catch clauses but I was never actually sure what "empty" means. Is a catch clause like this empty? It clearly isn't empty for the eye because ...
2
votes
3answers
129 views

Avoiding null in a controller

I'm trying to work through how to write this code. def get(params): """ Fetch a user's details, or 404 """ user = User.fetch_by_id(params['id']) if not user: abort(404) # ...
6
votes
6answers
1k views

If the model is validating the data, shouldn't it throw exceptions on bad input?

Reading this SO question it seems that throwing exceptions for validating user input is frowned upon. But who should validate this data? In my applications, all validations are done in the business ...
2
votes
4answers
199 views

How do you hide error handling? [duplicate]

Many people consider exceptions to be a problem because they create invisible paths through your code. For example in this snippet: function writeToFile(text, filename): filehandle = open(filename) ...
1
vote
1answer
314 views

Does this violate the using exceptions for flow control “rule”?

I plan to make use of this interface in a plug-in architecture. /// <summary> /// Generic interface allowing you to react to an event. /// You can block the event or just use it for ...
-1
votes
6answers
2k views

Converting an empty string to a number [closed]

If you are designing a function which should conver a string to an integer, how would you convert an empty string? The question is only about this one particular input value (empty string). Between ...
5
votes
8answers
1k views

Best Practice for Argument Checking

Say I have a web service with a method MyWebServiceMethod(string passedValue). The web service calls a method MyServiceMethod(string passedValue) where the value from the web service is passed along. ...
28
votes
5answers
11k views

Why is there no 'finally' construct in C++?

Exception handling in C++ is limited to try/throw/catch. Unlike Object Pascal, Java, C# and Python, even in C++ 11, the finally construct has not been implemented. I have seen an awful lot of C++ ...
1
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2answers
857 views

Assertions vs Exceptions - is my understanding of the differences between the two correct? [duplicate]

Design By Contract uses preconditions and postconditions of the public methods in a class together to form a contract between the class and its clients. a) In code we implement preconditions ...