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• Most appropriate OSS license for infrastructure code

  - by Richard Szalay

  I'm looking into potentially releasing some infrastructure code (related to automated builds and deployments) as OSS and I'm curious about how the various OSS licenses effect it. Specifically, LGPL prevents the code itself (part/whole) being modified into a commercial product (which is what I'm after), but allows it to be "linked to" in the creation of commercial products (also ok). How does the "linked to" clause relate to infrastructure code, which is not deployed with the product itself? Would the application still be required to provide "appropriate legal notices" (which I'm not fussed over)? Would I be better off looking at the Eclipse Public License?

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• Why Adobe Air is so underrated for building mobile apps?

  - by Marcelo de Assis

  I worked with Adobe Flash related technologies for the last 5 years, although not being a big fan of Adobe. I see some little bugs happening in some apps, but I cannot imagine why a lot of big companies do not even think to use use Adobe Air as a good technology for their mobile apps. I see a lot of mobile developer positions asking for experts in Android or iOS , but very much less positions asking for Adobe Air, even when Adobe Air apps have the advantage of being multi-plataform, with the same app working in Blackberry, iOS and Android. Is so much easier to develop a game using Flash, than using Android SDK, for example. It really have flaws (that I never saw) or it is just some kind of mass prejudgement? I also would like to hear what a project manager or a indie developer takes when choosing a plataform for building apps.

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• How I use RegExp in my Java program? [migrated]

  - by MIH1406

  I have the following string examples: 00001 1 12 123 00002 3 7 321 00003 99 23 332 00004 192 50 912 In a separate text file. Numbers are separated by tabs not spaces. I tried to read the file and print each line if it matches a given RegExp, but I could not find the suitable RegExp for these lines. private static void readFile() { String fileName = "processes.lst"; FileReader file = null; String result = ""; try { file = new FileReader(fileName); BufferedReader reader = new BufferedReader(file); String line = null; String regEx = "[0-9]\t[0-9]\t[0-9]\t[0-9]"; while((line = reader.readLine()) != null) { if(line.matches(regEx)) { result += "\n" + line; } } } catch(Exception e) { System.out.println(e.getMessage()); } finally { if(file != null) try { file.close(); } catch(Exception e) { System.out.println(e.getMessage()); } } System.out.println(result); } I ended up without any string being printed!!

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• OOD: All classes at bottom of hierarchy contain the same field

  - by My Head Hurts

  I am creating a class diagram for what I thought was a fairly simple problem. However, when I get to the bottom of the hierarchy, all of the classes only contain one field and it is the same one. This to me looks very wrong, but this field does not belong in any of the parent classes. I was wondering if there are any suggested design patterns in a situation like this? A simplified version of the class diagram can be found below. Note, fields named differently cannot belong to any other class +------------------+ | ObjectA | |------------------| | String one | | String two | | | +---------+--------+ | +---------------+----------------+ | | +--------|--------+ +--------|--------+ | ObjectAA | | ObjectAB | |-----------------| |-----------------| | String three | | String four | | | | | +--------+--------+ +--------+--------+ | | | | +--------|--------+ +--------|--------+ | ObjectAAA | | ObjectABA | |-----------------| |-----------------| | String five | | String five | | | | | +-----------------+ +-----------------+ ASCII tables drawn using http://www.asciiflow.com/

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• Is "Interface inheritance" always safe?

  - by Software Engeneering Learner

  I'm reading "Effective Java" by Josh Bloch and in there is Item 16 where he tells how to use inheritance in a correct way and by inheritance he means only class inheritance, not implementing interfaces or extend interfaces by other interfaces. I didn't find any mention of interface inheritance in the entire book. Does this mean that interface inheritance is always safe? Or there are guidlines for interface inheritance?

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• Changing my Sun SCJP certification to an Oracle one?

  - by Gugussee

  I hold a Sun SCJP from ten years ago or so. At first it was supposed to be a temporary certification (valid for a few years, I don't remember exactly: all I remember is that I had an expiration date on my certification card) then Sun changed their mind and decided the SCJP was lifetime valid. Another SCJP programmer told me I could change my cert so I contacted Sun (there was a procedure for that that I don't remember either) and received my new SCJP (without any expiration date). Now that Oracle bought Sun I was wondering: can I get somehow a Oracle/Sun SCJP paper/card/badge whatever knowing that I do own a SCJP? If anyone here holding an old SCJP changed it to an Oracle/Sun one (if such a thing exist), I'd be interested to hear what can be done. (btw I'm new here so I cannot create a new tag: maybe someone with more rep could create a Sun tag?)

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• Why write clean, refactored code?

  - by Shamal Karunarathne

  Hi programming lovers, This is a question I've been asking myself for a long time. Thought of throwing out it to you. From my experience of working on several Java based projects, I've seen tons of codes which we call 'dirty'. The unconventional class/method/field naming, wrong way of handling of exceptions, unnecessarily heavy loops and recursion etc. But the code gives the intended results. Though I hate to see dirty code, it's time taking to clean them up and eventually comes the question of "is it worth? it's giving the desired results so what's the point of cleaning?" In team projects, should there be someone specifically to refactor and check for clean code? Or are there situations where the 'dirty' codes fail to give intended results or make the customers unhappy? Do feel free to comment and reply. And tell me if I'm missing something here. Thanks.

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• Computer science curriculum for non-CS major?

  - by Daniel

  Hi all, I would like to have some ideas for building up my foundation CS skills. I have started programming computers 10 years ago and have made a pretty good career out of it. However, I cannot stop thinking that the path that brought me here was very particular, and if something goes wrong (e.g. I get laid off) it would be harder to find a job here in the US on the same salary level, OR in a top company. The reason I say that is that I am a self-learner; my degree is not in Computer Science so although I master C/C++/Java, I do not have the formal CS and mathematical background that many other software developers (esp. here in the US) have. When I look at job interview questions from Apple, Google, Amazon, I have the impression that I'd flunk those technical interviews at some point. Don't get me wrong, I know my algorithms and data structures, but when things dive too deeply into the CS realm I am in trouble. What can I do to close the gap? I was thinking about a MSc in CS, but will I even UNDERSTAND what's going on there if I'm not a CS undergrad? Should I go back to basics and get a BSc in CS instead? I always tend to go into self-study mode when I want to learn new stuff, but I have the impression that I will need more formal education in CS if I want to have a shot at working at those kinds of companies. Thank you!

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• Pirate Problem In Interview Question

  - by Hafiz

  Some one asked me this question in an interview, so I want to know that what can be technical or algorithmic or strategical solution can we provide? If I am a leader of Pirates who looted 100kg gold, now every pirate has 1 bullet in gun and every pirate wants to get each other's share. They are 5 in number including me. So what strategy I will use to get to kill others while being safe or is there way to decrease probability?

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• Node.js Or servlets?

  - by Nilesh

  I have heard a lot and read about the Javascript server side language i.e Node.js, and saw many comparisons in favor of Node. I don't understand what makes it better or faster, or how it even relates to something as mature as Java Servlets. But Servlets are built on top of a multithreaded programming language as opposed to Node.js. Then how can node.js be faster? If suppose 1000K users query for a database records, then shouldn't Node.js be slower than Servlets. Also Don't servlets have better security compared to Node.js?

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• How to deal with social login

  - by Matteo Pagliazzi

  In my new web app I'm going to allow social login through Twitter (maybe), Facebook and Google and I'm in search of the best way to do it. Actually I'm using Rails with Devise + Omniauth and this is the problem: Should I ask the user to choose a password so that he can login without a social network? Or maybe the user should be able to set a password if he want (for example when editing his account?) The second way seems the best one but since Twitter doesn't provide user email and google doesn't provide an username I'll probably have to ask the user for username/email when he log in so in that case I may also ask for the password... waht do you think?

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• What are the safety benefits of a type system?

  - by vandros526

  In Javascript: The Good Parts by Douglas Crockford, he mentions in his inheritance chapter, "The other benefit of classical inheritance is that it includes the specification of a system of types. This mostly frees the programmer from having to write explicit casting operations, which is a very good thing because when casting, the safety benefits of a type system are lost." So first of all, what actually is safety? protection against data corruption, or hackers, or system malfunctions, etc? What are the safety benefits of a type system? What makes a type system different that allows it to provide these safety benefits?

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• Java Alphabetize Algorithm Insertion sort vs Bubble Sort

  - by Chris Okyen

  I am supposed to "Develop a program that alphabetizes three strings. The program should allow the user to enter the three strings, and then display the strings in alphabetical order." It's instructed that I need to use the String library compareTo()/charAt()/toLowerCase() to make all the characters lowercase so the Lexicon comparison is also a alphabetical comparison. Input Pseudo Code: String input[3]; Scanner keyboard = new Scanner(System.in); System.out.println("Enter three strings: "); for(byte i = 0; i < 3; i++) input[i] = keyboard.next() The sorting would be Insertion Sort: 321 2 3 1 2 31 231 1 23 1 2 3 1 23 1 23 123 Bubble Sort 321 231 213 123 Which would be more efficient in this case? The bubble sort seems to be more efficient though they seem to have equal stats for worst best and avg case, but I read the Insertion Sort is quicker for small amounts of data like my case.

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• Is programming too easy if compared to other fields?

  - by Shashank jain

  I have been programming since some years and I won't say its a piece of cake but in this field, you know how to do things. You can always google up resources, tutorials. There are tons of already written code to help you with - frameworks, libraries but if you compare it to other innovation fields like "Electronics". Its not too easy to get started with, the community might not be too large on the internet, getting the things right plus lets not forget there is nothing to tell you where the error might be. I have wanted many times but not be able to get into, like, building some kind of robot because I don't know how to start. So my question is that, does programming tends to be easy compared rest of the fields or is it just my intrest that makes it easy?

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• Does anyone else not enjoy this 'Required 15 Reputation' to vote situation? [migrated]

  - by Oliver Hyde

  I know, it's most likely the reason stackexchange has become so popular, by forcing people to actually contribute. But as a full-time lurker, and long time user (only recently signed up), it kind of bums me out that I don't get to give credit where credit is due. I don't generally asks questions because I always find a related question before I get myself into the situation where I need to ask and I don't like to answer questions myself as I don't consider myself experienced enough to be contributing effectively. Hopefully the first response to this post is a quick solution to getting 15 reputation points that I haven't seen, and I can just quickly delete this useless question, or maybe a concise paragraph explaining why my question is redundant and that I should go back to my lurky shadows of which I came from. All I want to do, is give credit to helpful comments/questions.

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• Efficient Trie implementation for unicode strings

  - by U Mad

  I have been looking for an efficient String trie implementation. Mostly I have found code like this: Referential implementation in Java (per wikipedia) I dislike these implementations for mostly two reasons: They support only 256 ASCII characters. I need to cover things like cyrillic. They are extremely memory inefficient. Each node contains an array of 256 references, which is 4096 bytes on a 64 bit machine in Java. Each of these nodes can have up to 256 subnodes with 4096 bytes of references each. So a full Trie for every ASCII 2 character string would require a bit over 1MB. Three character strings? 256MB just for arrays in nodes. And so on. Of course I don't intend to have all of 16 million three character strings in my Trie, so a lot of space is just wasted. Most of these arrays are just null references as their capacity far exceeds the actual number of inserted keys. And if I add unicode, the arrays get even larger (char has 64k values instead of 256 in Java). Is there any hope of making an efficient trie for strings? I have considered a couple of improvements over these types of implementations: Instead of using array of references, I could use an array of primitive integer type, which indexes into an array of references to nodes whose size is close to the number of actual nodes. I could break strings into 4 bit parts which would allow for node arrays of size 16 at the cost of a deeper tree.

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• Why are we as an industry not more technically critical of our peers? [closed]

  - by Jarrod Roberson

  For example: I still see people in 2011 writing blog posts and tutorials that promote setting the Java CLASSPATH at the OS environment level. I see people writing C and C++ tutorials dated 2009 and newer and the first lines of code are void main(). These are examples, I am not looking for specific answers to the above questions, but to why the culture of accepting sub-par knowledge in the industry is so rampant. I see people posting these same type of empirically wrong suggestions as answers on www.stackoverflow.com and they get lots of up votes and practically no down votes! The ones that get lots of down votes are usually from answering a question that wasn't asked because of lack of reading for comprehension skills, and not incorrect answers per se. Is our industry that ignorant as a whole, I can understand the internet in general being lazy, apathetic and un-informed but our industry should be more on top of things like this and way more critical of people that are promoting bad habits and out-dated techniques and information. If we are really an engineering discipline, why aren't people held to a higher standard as they are in other engineering disciplines? I want to know why people accept bad advice, poor practices as the norm and are not more critical of their peers in the software industry.?

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• How to manage security of these self hosted web apis, to ensure that the request coming for accessing data is authenticated?

  - by Husrat Mehmood

  Let's pretend I am going to work on an enterprise application. Say I have 11 modules in the application and I would have to develop Dashboards for every role in the organization for whom I are going to develop application. We Decided to use Asp.Net Web Api and return json data from our apis. We are going to include 11 Self hosted web apis projects in our application (one self hosted web api) for every module. All 11 modules are connected to one Sql server 2012 Database. Then once api is ready we would have to create Business Dashboards (Based upon roles in Organization). So Now my web api client is Asp.Net Mvc application.Asp.Net mvc will consume those web apis. Here is the part for whom all explanation is done. How should I manage Security of all 11 self hosted web apis? How should I only authenticated request is coming? If I authenticate user by login and password and then redirect user to appropriate Dashboard designed for the role that user have and load data by consuming web apis. How should I ensure that the request coming for accessing data is authenticated?

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• Writing Large Portions Of Code Then Debugging?

  - by The Floating Brain

  Lately I have been writing a game engine, and I have been writing a lot of "foundation stuff" (standard interfaces, modules, a message system ect.), but I have noticed a pattern, a lot of the stuff is interdependent and I can not debug until everything is done, hence I do not debug for about 3 to 5 hours at a time. I am wondering if this is an acceptable practice for this part of the project, and if not, if anyone can give me some advice? -----Update-----: I downloaded some code metrics tools, and my programs cyclomatic complexity is 1.52 which as I understand it is good, and should correlate to high cohesion, if I am wrong please correct me/

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• Does the windows 8 store only support windows RT?

  - by Need4Sleep

  I'm in a project for creating a game engine and eventually a game, and we need ideas on how to get our game out into the internet. I had an idea with putting it onto the windows 8 store at a low cost(or free) in order to get the word out, but does the windows 8 store only support apps programmed in windows RT? our game will be built in C++ / OpenGL / GLEW / Actionscript / GLM / etc.. , so we wont be using any windows RT functionality at all.

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• Isolating test data in acceptance tests

  - by Matt Phillips

  I'm looking for guidance on how to keep my acceptance tests isolated. Right now the issue I'm having with being able to run the tests in parallel is the database records that are manipulated in the tests. I've written helpers that take care of doing inserts and deletes before tests are executed, to make sure the state is correct. But now I can't run them in parallel against the same database without uniquely generating the test data fields for each test. For example. Testing creating a row i'll delete everything where column A = foo and column B = bar Then I'll navigate through the UI in the test and create a record with column A = foo and column B = bar. Testing that a duplicate row is not allowed to be created. I'll insert a row with column A = foo and column B = bar and then use the UI to try and do the exact same thing. This will display an error message in the UI as expected. These tests work perfectly when ran separately and serially. But I can't run them at the same time for fear that one will create or delete a record the other is expecting. Any tips on how to structure them better so they can be run in parallel?

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• Be a better programmer or an irreplacable employee?

  - by mahen23

  Before I worked for a web development company, I asked a lot of questions of friends who were working as developers for tips about being good at your job. One answer I got was: "Always make the employers beg for your competencies. Prove to them that you are the best and you cannot be replaced. While keeping the status quo, hold your employers hostage where if one day they remove your from the job or task, no one else will be able to do your job." How true is this statement?

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• Evaluating Scrum - is it okay to have people with multiple roles in a Scrum team?

  - by Wayne M

  I'm evaluating some Agile-style methodologies for possible introduction to my team. With Scrum, is it allowable to have the same person perform multiple roles? We have a small team of four developers and a web designer; we don't really have a lead (I fulfill this role), QA testers or business analysts, and all of our development tasks come from the CIO. Automated testing is seen as a total waste of time, and everything focuses on speed and not quality. What will happen is the CIO will come up with a development task (whether a feature or a bug) and give it to a developer (not to the whole team, to an individual, often in private or out of the blue) who is then expected to get it completed. The CIO doesn't gather requirements beyond the initial idea (and this has bitten us before as we'll implement something only to find out that none of the end users can use the feature, because they weren't consulted or even informed about it before we developed it, and in a panic we'll be told to revert the change) but requires say in/approval of everything that we do. First things first, is a Scrum style something to consider to introduce some standards and practices? From reading, Scrum seems to rely on a bit more trust and communication and focuses more on project management than on development, which is something we are completely devoid of as we don't have any semblance of project management at present. Second, if it can work is it unreasonable for someone, let's say myself, to act as both ScrumMaster and a developer? Or for a developer to also be the Product Owner (although chances are this will be the CIO, who isn't a developer)? I realize the Scrum Master and the Product Owner should be different people but at the same time I don't think we have anyone who has the qualities of a Product Owner (chances are it would turn into a "I need all these stories, I don't care how but get it done" type of deal and/or any freeze would be unfrozen on a whim). It seems to me that I might need to pick and choose pieces of Scrum/XP/Lean to compensate for how things are done currently, as it's highly unlikely that the mentality can be changed; for instance Pair Programming would never fly (seen as a waste, you get half the tasks done if you need two people for everything), TDD would be a hard sell, but short cycles would be welcomed.

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• Using my own code in freelance projects.

  - by Witchunter

  I have been into freelance business for more than 2 years. While doing projects for other people, I've build a compilation of common tasks that I implement in projects and put them into code. It's kind of a library with some functions that I can reuse without having to rewrite the same thing dozen times. I'm talking about accessing Access databases, downloading information from FTP and similar stuff. Is this acceptable from a legal point of view? What's the difference in reusing the old code and rewriting it from the scratch (using you own brain again, therefore the exact same logic)? I do not hold any copyright to it, of course, and provide the source code for these classes to my clients.

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• What counts as reinventing the wheel?

  - by dsimcha

  Do the following scenarios count as "reinventing the wheel" in your book? A solution exists, but not in the language you want to use, and existing solutions can't be interfaced with the language you want to use in a clean, idiomatic way. In principle you could get an existing library to do what you wanted with heavy modification, but you think it would probably be easier to just start from scratch. What you're writing has the same one-line description as stuff that's already been done, but you're targeting a different niche. For example, maybe your problem has been solved a zillion times before, but in a way that's inefficient for large datasets and your code works well for large datasets.

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