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

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270 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 ...
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2answers
230 views

How do you handle specific networking exceptions in Haskell?

I have the following to try and connect to a server: testAddress :: HostName -> Int -> IO (Maybe Handle) testAddress host iPort = do let port = PortNumber $ fromIntegral iPort putStrLn ...
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1answer
141 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 ...
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3answers
294 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 ...
4
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2answers
77 views

Strategies to analyze collected exceptions

We want to add error feedback to our application. I had a look at existing solutions (e.g. raygun.io), but these work "in the cloud", which is a no-go for us: most installations of our application ...
4
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2answers
317 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 ...
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3answers
3k 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) ...
3
votes
2answers
2k views

How does the JVM handle an exception thrown by the main method?

I understand exceptions, throwing them, handling them, and propagating them to a method lower in the call stack (i.e. throws). What I don't understand is this: public static void main(String[] args) ...
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4answers
498 views

Is it possible/good idea to reduce chance of crashing by catching Error?

I have a class the implements A which will run a certain method of class B. There is a requirement that this A should never crash when running this operation (which is not possible, right?). To ...
3
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4answers
319 views

Is a long list of parameter checks an anti-pattern?

Background: I'm working on an application that will manage backup generators. These generators need to be able to be "linked" together. For example, Generator B might serve as a backup for ...
3
votes
2answers
940 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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2answers
662 views

Why do interrupts need to be turned off when inside other interrupt code?

Simple question that will help me understand my OS class... thanks! Basically, why is it unsafe to have an interrupt within an interrupt? (or exception within exception)
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3answers
366 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 ...
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4answers
215 views

How much data should exceptions hold?

Almost all the exceptions I have ever written have been very lightweight, containing a String message and optionally a throwable. In some situations I have included some application specific enum or ...
3
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3answers
135 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 ...
3
votes
2answers
144 views

Best strategy to find the root cause when exception is swallowed by 3rd party

I am sure we have all run into a scenario where a 3rd part API complains with an incomplete stack trace. In essence the error handling in the 3rd party API does something like this, catch ...
3
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4answers
352 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. ...
3
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2answers
133 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
365 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 ...
3
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2answers
240 views

How to handle fired listeners exceptions

This is more of a design question and i was hoping to get pros and opinions on what makes sense. BACKGROUND Imagine something that holds one or more event listeners. Every now and then the thing ...
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5answers
235 views

Exception handling and 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 ...
3
votes
1answer
132 views

Exceptions in ANSI C

Would it be possible to implement exception mechanism in pure ANSI C similar to the one used in popular OOP languages (with familiar try-catch-finally clauses)? If yes then how? I'm especially ...
3
votes
1answer
311 views

Java-Like 'throws'-information in method signature C#

From Java I know that the signatures of methods that can throw exceptions contain a throws block, that contains the Exception(s) that might be thrown. In C# there is no such thing and it is also not ...
3
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2answers
294 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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2answers
200 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. ...
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2answers
222 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
1k 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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1answer
335 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
182 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
144 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 ...
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3answers
3k 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 ? ...
3
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1answer
56 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 = ...
3
votes
2answers
189 views

Should I throw guard exceptions that will be thrown by internal methods anyway? [duplicate]

I have some fairly simple code (C#): /// <summary> /// Truncates a string to a maximum length. /// </summary> /// <param name="value"> The string to truncate. ...
3
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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 ...
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2answers
894 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 ...
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1answer
101 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
543 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
votes
3answers
815 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
138 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
votes
1answer
370 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
votes
7answers
1k 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
1answer
142 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 ...
2
votes
4answers
203 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) ...
2
votes
3answers
1k 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
votes
3answers
136 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 ...
2
votes
3answers
412 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
3answers
133 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
votes
1answer
130 views

RefactorException: Good idea or bad idea?

When I'm doing large scale refactors I'm often commenting out the contents of methods and using NotImplementedExceptions for stuff that I still need to refactor. Problem is that this is interfering ...
2
votes
1answer
112 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 ...
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1answer
74 views

Under which circumstances does it make sense to lose track of where an exception was thrown from?

Is there any valid reason why a catch block on a lower layer would throw back an exception caused by a higher, unknown layer using the following syntax: throw ex; ... rather than: throw; ... ? ...