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

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198 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 ...
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2answers
622 views

How to remove duplicate exception block code

I have good number of Service and DAO classes which has the same set of 30 line exception code block which gets repeated and it shows up in Code Duplication report. The approach which i can think of ...
3
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3answers
202 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 ...
3
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1answer
52 views

When to declare @throws with a Scala annotation - abstract parent or concrete implementation?

In this StackOverflow question I asked about the behavior of the @throws annotation in Scala. Now that I understand how it works I want to ask about best practices with using it. Here's a repost of my ...
3
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1answer
159 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 ...
3
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1answer
1k 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 ...
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1answer
133 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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2answers
423 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 ...
2
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1answer
49 views

Is it good practice to use NoStackTrace in scala?

I came across the NoStackTrace mixin for Exceptions in scala. Is it good practice to use it, or should it be considered "internal" to scala and left alone?
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3answers
470 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 ...
2
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3answers
699 views

What do you think of this Exception handling practice

I'm working on a project that includes a lot of creating/manipulating and reading JSONObjects and arrays but not in a systematic way. So there is JSON code everywhere. It is ok for me except that ...
2
votes
1answer
115 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. ...
2
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1answer
320 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 ...
2
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7answers
604 views

better way to define an exception thrown by a method in Java?

I know how to define exceptions and all, but I'm not sure if the way I'm doing it is the most intuitive and readable by another users. I have a very simple method I've written that I want to throw an ...
2
votes
4answers
170 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. ...
2
votes
4answers
186 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) ...
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3answers
802 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 ...
2
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3answers
357 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
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2answers
94 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 ...
2
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3answers
125 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) # ...
2
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1answer
87 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 ...
2
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1answer
90 views

What are possible/useful implementations when extending exceptions?

I have seen a lot of exceptions - custom or integrated in the language (PHP) itself that have no differences but their class name. When extending default exceptions to use within your own code, are ...
2
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1answer
194 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 ...
2
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1answer
98 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 ...
2
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3answers
2k 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 ? ...
2
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1answer
56 views

Error handling, creating time line, need help defining what aspects of the environment need tracking

For my final year project, I'm working on a script that will run your python program and provide a time line of events(so far working on assignments) and create a story of what happened(the changes in ...
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4answers
440 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(); } ...
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3answers
205 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) { ...
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2answers
316 views

Why does File.Open in .Net throw exceptions and not follow exception handling best practices? [duplicate]

I have read at many places including this - http://msdn.microsoft.com/en-us/library/seyhszts.aspx - that you should use exception handling when something is truly exceptional. The .Net File.Open ...
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1answer
210 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 ...
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3answers
204 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 ...
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3answers
229 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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1answer
256 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 ...
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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 ...
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2answers
257 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 ...
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3answers
94 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", ...
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1answer
349 views

How does compiler handle exceptions that are implicit? Looking for design strategies

Throughout the function handleException, the exception encountered is implicit. How does the compiler handle such implicit passing of exceptions? [For e.g. in C++ methods, this pointer is passed to ...
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1answer
98 views

Pros and cons of custom exceptions [duplicate]

This may be an pointless question based on opinion, style, and context but I've been racking my brain trying to decide whether or not to make use of custom exceptions and would love to hear some pros ...
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1answer
54 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 ...
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3answers
200 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 ...
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2answers
631 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 ...
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2answers
243 views

Wrapping specific checked exception in domain unchecked ones? [duplicate]

Uncle Bob says in Clean Code book that Unchecked Exceptions should be used. Now JDK has some checked exceptions: IOException, IllegalAccessException etc. which cannot be avoided. In my application ...
1
vote
1answer
61 views

Why is Throwable initCause designed to be called only once?

I find it really odd that the initCause method of Java's Throwable class can only be called once, or even not at all (if the constructor accepting a Throwable was used). This makes exception chaining ...
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1answer
208 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 ...
0
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5answers
187 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 ...
0
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2answers
158 views

IllegalStateException vs. IllegalArgumentException

In have written a function which expects the caller to pass in a configuration file like XML. Then I parse this given file and extract something which i then return. In this function (at least) two ...
0
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5answers
256 views

Should we only catch in exceptional circumstances?

Whether error handling by throwing exceptions is good or bad is contentious. Are exceptions as control flow considered a serious antipattern? If so, Why? The common line is that exceptions are for ...
0
votes
4answers
57 views

alerting that an object cannot be deleted (due to constraints)

Assume an application with a rich domain model with many classes (e.g School, Classroom, Teacher, Student, Course, Exam, Submission, ...) linking to each other. Model and links are mapped to the ...
0
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2answers
327 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 ...
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2answers
180 views

Is there anything special to consider when writing my own exception class in C++? [closed]

If I wanted to implement my own version of the std::exception for no good reason, are there any special things about implementing this kind of object that I should be aware of? It seems like a fairly ...