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• Is catching general exceptions really a bad thing?

  - by Bob Horn

  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 rationale for this rule. But, in practice, if I want to take the same action regardless of the exception thrown, why would I handle each one specifically? Furthermore, if I handle specific exceptions, what if the code I'm calling changes to throw a new exception in the future? Now I have to change my code to handle that new exception. Whereas if I simply caught Exception my code doesn't have to change. For example, if Foo calls Bar, and Foo needs to stop processing regardless of the type of exception thrown by Bar, is there any advantage in being specific about the type of exception I'm catching?

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• Advice: The first-time interviewer's dilemna

  - by shan23

  I've been working in my first job for about 2 years now, and I've been "asked" to interview a potential teammate (whom I might have to mentor as well) on pretty short notice (2 days from now). Initially, I had been given a free rein(or so I thought, and hence agreed), but today, I've been told "not to pose bookish questions" - implying I can only ask basic programming puzzles and stuff similar to the 'fizbuzz' question. I strongly believe that not knowing basic algorithmic notations(the haziest ideas of space/time complexities) or the tiniest idea of regular expressions would make working with the guy very difficult for anyone. I know i'm asking for a lot here, but according to you, what would be a comprehensive way to test out the absolutely basic requirements of a CS guy(he has 2 yrs of exp) without sounding too pedantic/bookish etc ? It seems it would be legit to ask C questions/simple puzzles only....but I really do want to have something a bit different from "finding loops in linked lists" that has kind of become the opening statement of most techie interviews !! This is a face-to-face interview with about an hour or more of time - I looked at Steve's basic phone-screen questions, and I was wondering if there exists a guide on "basic face-to-face interview questions" that I can use(or compile from the community's answers here). EDIT: The position is mostly for a kernel level C programming job, with some smattering of C++ required for writing the test framework.

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• What is 'work' in the Pomodoro Technique?

  - by Sachin Kainth

  I have just started to use Pomodoro today and I am trying to work out what I should and should not do during my 25 minute work time. For my 25 minute work stint I started to write some code and realised that I had done something similar in a related project so I opened that solution to copy and paste that existing code. Question is, is this allowed? Also, if during my 25 minutes I realise that there is an important work-related email that I need to send can I do that or should that wait for the next 25 minutes or the break. I am writing this question during my, now extended, 5 minute break. Is this work or is it a break? I really would appreciate some guidance as I really want to use Pomodoro to focus better on my work. Another thing that happened to me was that a Adobe AIR update alert came up on my desktop during the 25 minutes. Should I ignore such things until the break? Sachin

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• .NET developer needs FoxPro advice

  - by katit

  We have a prospect with FoxPro 2.6 (whatever it means) system. Our product integrates with other systems by the means of triggers (usually). We would place couple of triggers on X system and then just pull collected data for our use. This way there is no need to customize customers product and it works great(almost real time - we poll for changes every 30 seconds). Question: Can I put triggers on FoxPro 2.6? Can access FoxPro from .NET? Any catches/caveats?

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• Web Designer and/or Developer

  - by chimps

  we've outsourced our app development, the dev's have created a DB hosted on Amazon-EC2. we're in talks with a web designer for website but the designer does not do any backend integration. i.e connect the website with DB created by app developers do you recommend getting designs from the designer and getting a freelancer to do the front-back end integration, I mean would there be issues/complications? Or go with designer who provides the complete package?

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• Apache Commons PropertiesConfiguration escapes characters on Save [migrated]

  - by Anuvrat

  I am using the commons-configuration from apache commons library. I have a properties file which has properties like: blog_loc=http://my.blog.com blog_name="my blog name" I open the properties file, change the blog_name property and save the file. The following are the lines of code I use: PropertiesConfiguration propertyFile = new PropertiesConfiguration(propertyFileName); propertyFile.setProperty(blog_name, "blog name"); propertyFile.save(propertyFileName + ".out"); Unfortunately, in the output file certain characters get escaped as follows: blog_loc=http:\/\/my.blog.com blog_name=\"blog name\" Is there any way of preventing escaping of the above characters?

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• Ashamed to admit using jQuery?

  - by Matt Stevens

  Something I've noticed over the past few weeks is how many big commercial websites use jQuery combined with lots of plugins - but don't admit it. They will rename the main library to something obscure, as well as the plugins. Quite a few will even remove the comments that contain the MIT/GPL license information. (just noticed today that odeon.co.uk have done exactly this) Why are they doing this? are they abashed by the face that they are using a free and open source library?

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• Exception while running an EJB program [closed]

  - by rajesh

  I'm a newbie to JEE. I'm trying a sample EJB3 program given in this website. while trying to run the client program, I get an exception like this [JBossManagedConnectionPool] Throwable while attempting to get a new connection: null org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (org.jboss.resource.JBossResourceException: Failed to register driver for: com.mysql.jdbc.Driver; - nested throwable: (java.lang.ClassNotFoundException: com.mysql.jdbc.Driver from BaseClassLoader@4c19dd{VFSClassLoaderPolicy@35fd58{name=vfszip:/home/rajesh/workspace/jboss-5.1.0.GA/server/default/deploy/FirstJPAproject.jar/ domain=ClassLoaderDomain@17380fc{name=DefaultDomain parentPolicy=BEFORE parent=org.jboss.bootstrap.NoAnnotationURLClassLoader@76cbf7} roots=[MemoryContextHandler@9160338[path= context=vfsmemory://3j001-rho3wm-h8v3wfs4-1-h8v5pkwn-9u real=vfsmemory://3j001-rho3wm-h8v3wfs4-1-h8v5pkwn-9u], DelegatingHandler@25335794[path=FirstJPAproject.jar context=file:/home/rajesh/workspace/jboss-5.1.0.GA/server/default/deploy/ real=file:/home/rajesh/workspace/jboss-5.1.0.GA/server/default/deploy/FirstJPAproject.jar] I'm using Jboss5.1.0 and ejb 3.0 Please help me to get rid of this.

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• Builder Pattern: When to fail?

  - by skiwi

  When implementing the Builder Pattern, I often find myself confused with when to let building fail and I even manage to take different stands on the matter every few days. First some explanation: With failing early I mean that building an object should fail as soon as an invalid parameter is passed in. So inside the SomeObjectBuilder. With failing late I mean that building an object only can fail on the build() call that implicitely calls a constructor of the object to be built. Then some arguments: In favor of failing late: A builder class should be no more than a class that simply holds values. Moreover, it leads to less code duplication. In favor of failing early: A general approach in software programming is that you want to detect issues as early as possible and therefore the most logical place to check would be in the builder class' constructor, 'setters' and ultimately in the build method. What is the general concensus about this?

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• Releasing an open source project without getting embarrassed

  - by Hopeful

  I've been working by myself on a fairly large open source project for quite a while and it's nearing the point where I'd like to release it. However, I'm self-taught and I don't really know anyone who could adequately review my project. A few years ago, I had released a small bit of code which pretty much got ripped apart (in a critical sense) on the forum where I released it. Even though the code worked, the criticism was accurate but brutal. It prompted me to begin searching for best practices for everything and in the end I feel that it made me a much better developer. I've gone over everything in my project so many times trying to make it perfect that I've lost count. I believe in my project and think it has the potential to help a lot of people and I feel like I've done some cool things in interesting ways with it. Still, because I'm self-taught, I can't help but wonder what gaps exist in my self-education. The way my code was ripped apart last time isn't something I'd like to repeat. I think my two biggest fears with releasing my project that I've poured countless hours into are being absolutely embarrassed because I missed some patently obvious things because of my self-education or, worse, releasing it to the sound of crickets. Is there anyone who has been in a similar situation? I'm not afraid of constructive criticism, so long as it is constructive and not just a rant on how I screwed up. I know there is a code review site on StackExchange, but it's not really set up for large projects and I didn't feel like the community there is large enough yet to get good feedback if I were to post parts of my project piecemeal (I tried with one file). What can I do to give my project at least some measure of success without getting embarrassed or devestated in the process?

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• How does the ? make a quantifier lazy in regex

  - by Uriel Katz

  I've been looking into regex lately and figured that the ? operator makes the *,+, or ? lazy. My question is how does it do that? Is it that *? for example is a special operator, or does the ? have an effect on the *? In other words, does regex recognize *? as one operator in itself, or does regex recognize *? as the two separate operators * and ?? If it is the case that *? is being recognized as two separate operators, how does the ? affect the * to make it lazy. If ? means that the * is optional, shouldn't this mean that the * doesn't have to exists at all. If so, then in a statement .*? wouldn't regex just match separate letters and the whole string instead of the shorter string? Please explain, I'm desperate to understand.

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• How to protect a peer-to-peer network from inappropriate content?

  - by Mike

  I’m developing a simple peer-to-peer app in .Net which should enable users to share specific content (text and picture files). As I've learned with my last question, inappropriate content can “relatively” easily be identified / controlled in a centralized environment. But what about a peer-to-peer network, what are the best methods to protect a decentralized system from unwanted (illegal) content? At the moment I only see the following two methods: A protocol (a set of rules) defines what kind of data (e.g. only .txt and jpg-files, not bigger than 20KB etc.) can be shared over the p2p-network and all clients (peers) must implement this protocol. If a peer doesn’t, it gets blocked by other peers. Pro: easy to implement. Con: It’s not possible to define the perfect protocol (I think eMail-Spam filters have the same problem) Some kind of rating/reputation system must be implemented (similar to stackoverflow), so “bad guys” and inappropriate content can be identified / blocked by other users. Pro: Would be very accurate. Con: Would be slow and in my view technically very hard to implement. Are there other/better solutions? Any answer or comment is highly appreciated.

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• Mobile websites, where is it going to?

  - by Fadi Tiwari

  As building websites for mobile devices is becoming an important area I have a question that has some sub questions regarding this new field and the main question is: Will web development for mobile devices grow in the next few years? The sub questions are: Will there be standalone mobile web applications? meaning that a web application that is designed and developed to browse from mobile only? What about the advertisements and how can companies and freelancers get money from their mobile web applications? Cheers.

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• Building a database class in PHP

  - by Sprottenwels

  I wonder if I should write a database class for my application, and if so, how to accomplish it? Over there on SO, a guy mentioned it should be written as an abstract class. However, I can't understand why this would be a benefit. Do I understand correctly, that if I would write an abstract class, every other class that methods will need a database connection, could simply extend this abstract class and have it's own database object? If so, how is this different from a "normal" class where I could instantiate an database object? Another method would be to completely forget about my own class and to instantiate a mysqli object on demand. What do you recommend?

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• Are More Comments Better in High-Turnover Environments?

  - by joshin4colours

  I was talking with a colleague today. We work on code for two different projects. In my case, I'm the only person working on my code; in her case, multiple people work on the same codebase, including co-op students who come and go fairly regularly (between every 8-12 months). She said that she is liberal with her comments, putting them all over the place. Her reasoning is that it helps her remember where things are and what things do since much of the code wasn't written by her and could be changed by someone other than her. Meanwhile, I try to minimize the comments in my code, putting them in only in places with a unobvious workaround or bug. However, I have a better understanding of my code overall, and have more direct control over it. My opinion in that comments should be minimal and the code should tell most of the story, but her reasoning makes sense too. Are there any flaws in her reasoning? It may clutter the code but it ultimately could be quite helpful if there are many people working on it in the short- to medium-run.

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• Returning null vs Throwing exceptions

  - by Svish

  Is in a bit of disagreement with a more experienced developer on this issue, and was wondering what you guys here think about this. Environment is Java, EJB 3, services, etc. The code I wrote calls a service to get things and to create things. Problem was that I got null pointer exceptions in places that didn't make sense. For example when I asked the service to create an object, I got null back. And when I tried to look up an object with an id I knew existed, I still got null back. Was like it was ignoring me. Spent some time trying to figure out what was wrong in my code (since I'm less experienced I usually assume I have messed up). Turns out the reason was security. If the user principal using my service didn't have the right permissions to use the service I called from my service, then that service simply returned null. The services that are here already are usually not documented either, so this is just something you have to know... somehow... So here is the thing: I mean that this is rather confusing as a developer interacting with this service. To me it would make much more sense if that service thew an exception which would tell me that hey, you don't have the proper permissions to get info about this thing or to create this new thing. I would then immediately know why my service wasn't working as expected. However, he argued that asking is not wrong. Exceptions should only be thrown when there is an error and asking for a thing is not an error. Even if you don't have permission to "see" that the thing you asked for. The things are often looked up in a GUI by users and for those users not having the right permissions, these things simply "do not exist". So, in short: Asking is not wrong, hence no exception. Get methods return null because to those users those things "doesn't exist". Create methods return null because nothing was created, since the user wasn't allowed to create anything. So, what do you guys think? Is this normal and/or good practice? I prefer exceptions as I prefer throwing and catching exceptions because I find it much easier to know what's going on. So I would for example also prefer to throw a NotFoundException if you asked for an id which didn't exist, rather than returning null. Anyways, just curious to what others think about this as I'm not the most experienced developer yet.

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• signal processing libraries

  - by khinester

  Are there any open source libraries/projects which work in a similar way to http://www.tagattitude.fr/en/products/technology? I am trying to understand the process. At first I thought this could work like when you send a fax to a fax machine. It is basically using the mobile phone’s microphone as a captor and its audio channel as a transporter. Are there any libraries for generating the signal and then being able to decode it?

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• Inheritance, commands and event sourcing

  - by Arthis

  In order not to redo things several times I wanted to factorize common stuff. For Instance, let's say we have a cow and a horse. The cow produces milk, the horse runs fast, but both eat grass. public class Herbivorous { public void EatGrass(int quantity) { var evt= Build.GrassEaten .WithQuantity(quantity); RaiseEvent(evt); } } public class Horse : Herbivorous { public void RunFast() { var evt= Build.FastRun; RaiseEvent(evt); } } public class Cow: Herbivorous { public void ProduceMilk() { var evt= Build.MilkProduced; RaiseEvent(evt); } } To eat Grass, the command handler should be : public class EatGrassHandler : CommandHandler<EatGrass> { public override CommandValidation Execute(EatGrass cmd) { Contract.Requires<ArgumentNullException>(cmd != null); var herbivorous= EventRepository.GetById<Herbivorous>(cmd.Id); if (herbivorous.IsNull()) throw new AggregateRootInstanceNotFoundException(); herbivorous.EatGrass(cmd.Quantity); EventRepository.Save(herbivorous, cmd.CommitId); } } so far so good. I get a Herbivorous object , I have access to its EatGrass function, whether it is a horse or a cow doesn't matter really. The only problem is here : EventRepository.GetById<Herbivorous>(cmd.Id) Indeed, let's imagine we have a cow that has produced milk during the morning and now wants to eat grass. The EventRepository contains an event MilkProduced, and then come the command EatGrass. With the CommandHandler, we are no longer in the presence of a cow and the herbivorious doesn't know anything about producing milk . what should it do? Ignore the event and continue , thus allowing the inheritance and "general" commands? or throw an exception to forbid execution, it would mean only CowEatGrass, and HorseEatGrass might exists as commands ? Thanks for your help, I am just beginning with these kinds of problem, and I would be glad to have some news from someone more experienced.

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• c# class naming standards/guidelines

  - by Ben

  Over the years I've used various naming conventions for services in my applications for example: [ClassName]Service [ClassName]Manager [ClassName]Factory [ClassName]Provider [ClassName]Helper I generally only use the "Helper" suffix for utility classes that have no external dependencies. However I find that there is a bit of a cross-over between the others, and wondered if there was any recommendations/standards/guidelines on what to use and when?

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• How to publish paid Android apps if you're not from US/UK

  - by Sheikh Aman

  I was pretty excited while creating one of my apps but as it turns out you can't actually sign up for Google Checkout if you don't live either in the USA or in the UK. And since Google Checkout is the only way Android Market will pay you, all my efforts seem to be going in vain. So because I live in India, I can't sell my apps. I tried contacting Google by various means on this, but haven't got any response so far. I tried searching the web as well just to find out that one can't be paid via any other way. I am pretty sure that many people here might have gone through the same problem. How did you solve it? I have a PayPal account and an AdSense account as well. Can they help in any way? And if nothing works out, how am I supposed to be selling my app?

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• Buzzword for "performance-aware" software development

  - by errantlinguist

  There seems to be an overabundance of buzzwords for software development styles and methodologies: Agile development, extreme programming, test-driven development, etc... well, is there any sort of buzzword for "performance-aware" development? By "performance awareness", I don't necessarily mean low-latency or low-level programming, although the former would logically fall under the blanket term I'm looking for. I mean development in which resources are recognised to be finite and so there is a general emphasis on low computational complexity, good resource management, etc. If I was to be snarky, I would say "good programming", but that doesn't seem to get the message across so well...

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• How should Code Review be Carried Out?

  - by Graviton

  My previous question has to do with how to advance code review among the developers. Here I am interested in how the code review session should be carried out, so that both the reviewer and reviewed are feeling comfortable about it. I have done some code review before, but the experience sucks big time. My previous manager would come to us-- on an ad hoc basis-- and tell us to explain our code to him. Since he wasn't very familiar with the code base, I spent a huge amount of times explaining just the most basic structure of my code to him. This took a long time and by the time we were done, we were both exhausted. Then he would raise issues with my code. Most issues he raised were cosmetic in nature ( e.g, don't use region for this code block, change the variable name from xxx to yyy even though the later makes even less sense, and so on). We did this a few rounds, and the review session didn't derive much benefits for us, and we stopped. What do you have to do, in order to make code review a natural, enjoyable, thought stimulating, bug-fixing and mutual-learning experience?

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• Can someone explain to me C#'s coding convention?

  - by AedonEtLIRA

  I recently started working with Unity3D and primarily scripting with C#. As, I normally program in Java, the differences aren't too great but I still referred to a crash course just to make sure I am on the right track. However, My biggest curiosity with C# is that is capitalises the first letter its method names (eg. java: getPrime() C#: GetPrime() aka: Pascal Case?). Is there a good reason for this? I understand from the crash course page that I read that apparently it's convention for .Net and I have no way of ever changing it, but I am curious to hear why it was done like this as opposed to the normal (relative?) camel case that, say, Java uses. Note: I understand that languages have their own coding conventions (python methods are all lower case which also applies in this question) but I've never really understood why it isn't formalised into a standard.

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• What resources do you recommend for learning more about TCP/IP, networking, and related areas?

  - by mkelley33

  As a relatively-new Python programmer, I'm finding more and more that networking as it relates to the web and web development is becoming increasingly important to understand. When I was an active C# ASP.NET programmer making smaller websites with less responsibility this knowledge seemed less important, since there was often a "networking" guy performing any tasks beyond acquiring a domain name for a client. Which books, websites, presentations, articles, or other resources would you recommend so that I best understand what's happening between the time a user types a URL and receives the rendered HTML? Thanks!

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• How you return to a code when you don't remember what you were doing?

  - by speeder

  Well, I have some problems with procrastination and whatnot, but those get infinitely worse, when I cannot remember what I should be doing. I mean, I know my project, I wrote 100% of the code so far, and I knew more or less what I was doing, but I don't remember exactly what, I don't remember what file I was editing and why. How I get back on track? (because right now my technique of opening the source code and staring at it is not working)

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