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  • What are the security implications of running untrusted code on my server?

    - by rahmu
    I would like to set up an app that allows users to send their code and execute it on my server. The thought of running untrusted code makes me cringe, so I am trying to set up an exhaustive list of security threats that should be addressed. I am assuming I should strip down certain features of the language executed, like file access or (maybe) networking. I also come across terms like sandboxing or chroot. I know what they mean, but how should I actually use them? In short: What security threats should I address before allowing users to run their code on my machine, and how do I do it?

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  • Typescript - A free add-on for Visual Studio 2012

    - by TATWORTH
    At http://www.microsoft.com/en-us/download/details.aspx?id=34790, Microsoft are providing a free add-on for Visual Studio. If you have any version of Visual Studio 2012, it provides an editor for Typescript."TypeScript is a language for application-scale JavaScript. TypeScript adds optional types, classes, and modules to JavaScript. TypeScript supports tools for large-scale JavaScript applications for any browser, for any host, on any OS. TypeScript compiles to clean, readable, standards-based JavaScript. Try it out at http://www.typescriptlang.org/playground."I look forward to type-safe JavaScript!There is a tutorial for it at http://www.typescriptlang.org/tutorial/

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  • Testing Git competence

    - by David
    I hire a lot of programmers for tiny tasks. I very clearly specify that the tasks can only be completed by making a pull request on GitHub. Unfortunatelly, so many programmers do not know Git and often the programmers cannot complete the project due to not understanding/being willing to learn Git, even after they have undertaken the programming of the task. This is bad both for me and for the programmers. Sometimes I end up arguing for why it is inefficient that they just send me a zip file containing the code. Therefore, I am looking for an online service to certify that the programmers know how to make a pull request so I do not waste their nor my time. The certificate should be free for the coders, but may cost me. It is important that the course just focuses on exactly what is needed to make a clean pull request so it should not take more than 5 minutes to go through. Does such a thing exist?

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  • How often do CPUs make calculation errors?

    - by veryfoolish
    In Dijkstra's Notes on Structured Programming he talks a lot about the provability of computer programs as abstract entities. As a corollary, he remarks how testing isn't enough. E.g., he points out the fact that it would be impossible to test a multiplication function f(x,y) = x*y for any large values of x and y across the entire ranges of x and y. My question concerns his misc. remarks on "lousy hardware". I know the essay was written in the 1970s when computer hardware was less reliable, but computers still aren't perfect, so they must make calculation mistakes sometimes. Does anybody know how often this happens or if there are any statistics on this?

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  • Crappy school, what to do? [closed]

    - by zhenka
    I started programming fairly late. I am 24 years old and about to graduate from a local public university with a really poorly designed curriculum and teachers. Most of the work felt like busy work, and no matter how much I try, it all feels like a waste. I know what a good curriculum looks like. I know what books I should read, but alas it's not so in my university. There is no way at this point that I can catch up to those graduating from places like MIT. My question and this is a serious one: what do I do? Do I just postpone learning the theory I would have learned until later and focus on software engineering skills? How important is the theory in terms of landing a job in New York? Any particular things I should focus on to land a software engineer job? I am very motivated and I just wish someone would give me the time and a chance.

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  • Advice: should I focus on PHP + MySQL, or split my time for more JS and CSS? [closed]

    - by fakaff
    I started learning web development about three months ago (in between working my regular job), and I'm finally starting to get some vague, distant notion of understanding. I find the server-side stuff the most interesting; though I've not gone anywhere near Apache quite yet, which I assume will be necessary at some point. As cool as toying around with visuals and UI is, programming and database stuff inspires me with new ideas and possibilities every minute (I've even bought, on a whim, a wonderfully dry bunch of books on database theory and relational algebra). And whatever CSS or Javascript tutorial I'm doing, it often feels like a distraction from the PHP/MySQL stuff I'd rather be playing with. For someone like me who's just starting out, which is the most advisable course of action? (in terms of being marketable as a programmer): To focus on PHP and SQL stuff exclusively, and only once I master those to diversify my skills. To first learn all three (PHP/MySQL, Javascript, CSS and design) and only once I'm fluent in all three focus on PHP and databases?

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  • How many CISC instructions do compilers use?

    - by Euphoric
    CISC processors have sometimes huge instruction sets. This makes assembly programming somehow easier. But it reduces overall effectivness of the whole chip. But how many of those instructions are used by modern compilers? I'm especialy interested in relation of CISC vs. RISC where in CISC, compiler can use specialised instructions, that might increase effectivness. But do compilers use those instructions? If yes, then how many of them are used?

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  • What should I think about when switching from Python to Java?

    - by Nick Rosencrantz
    I was a Java developer in the early 2000s, switched to Python in 2008 and now Iäm working in Java again. Is there anything special you think I should keep in mind when going back to a Java environment? I used to work with EJB 1.0, I didn't work with EJB 2.0 and now we have JPA instead. I'm comfortable programming in Java and my new job with Java is much better than my Python job even though Python is my favorite language the tools and others things about my Java job makes it much better. I found when I searched jobs that demand for Java developer was much greater than demand for Python programmers- do you have a similar experience? Thank you

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  • Security Alert for CVE-2011-5035 Updated

    - by Eric P. Maurice
    Hi, this is Eric Maurice again.  Oracle has just updated the Security Alert for CVE-2011-5035 to announce the availability of additional fixes for products that were affected by this vulnerability through their use of the WebLogic Server and Oracle Container for J2EE components.  As explained in a previous blog entry, a number of programming language implementations and web servers were found vulnerable to hash table collision attacks.  This vulnerability is typically remotely exploitable without authentication, i.e., it may be exploited over a network without the need for a username and password.  If successfully exploited, malicious attackers can use this vulnerability to create denial of service conditions against the targeted system. A complete list of affected products and their versions, as well as instructions on how to obtain the fixes, are listed on the Security Alert Advisory.  Oracle highly recommends that customers apply these fixes as soon as possible.

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  • What undergraduate course to choose for a mature programmer returning to study

    - by Dve
    I have been developing applications (mostly web-based) for almost 10 years now and have learnt pretty much everything I know through experience (and the internet!). I wouldn't call myself an advanced programmer, but I am quite proficient in several languages (C#, Javascript, Ruby, HTML/CSS etc) and spend a quite a bit of time working on personal projects and reading countless books & articles. I am looking to emigrate to Canada, hopefully Vancouver (im from the UK) and one way would be on a student visa, if I was going to be studying for a minimum of 2 years. Having never been to university or achieved anything higher than A-Levels I am quite tempted by this path. The thought of learning is more exciting to me now than it was 10 years ago! What would be people recommend as a good undergraduate course to take that would complement this career path? Would Math be beneficial, if so which area of Math? TL;DR What undergraduate course/area of study would complement 10 years of (mostly web-based) programming experience?

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  • How much C/C++ knowledge is needed for Objective-C/iPhone development?

    - by BFree
    First, a little background. I'm a .Net developer (C#) and have over 5 years experience in both web development and desktop applications. I've been wanting to look into iPhone development for some time now, but for one reason or another always got side tracked. I finally have a potential project on the horizon, and I'm now going full steam ahead learning this stuff. My question is this: I haven't done any C/C++ programming since my schooling days, I've been living in managed land ever since. How much knowledge if any is needed to be successful as an iOS developer? Obviously memory management is something that I'll have to be conscious about (although with iOS 5 there seems to be something called ARC which should make my life easier), but what else? I'm not just talking about the C API (for example, in order to get the sin of a number, I call the sin() function), that's what Google is for. I'm talking about fundamental C/C++ idioms that the average C# developer is unaware of.

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  • JOB OF THE WEEK

    - by Tim Koekkoek
    ERP Pre-Sales Consultant - Malaga The job as a ERP Pre-Sales consultant is challenging and diverse and you will be working in a multinational environment in our EMEA Presales Centre in the vibrant city of Malaga. Frequent possibilities to support opportunities in various industries and countries will give you an excellent insight into customer business needs and market trends. You will support the ERP Presales organisation for the Benelux, Germany, UK and Spain (depending on your language) and be trained in the Oracle ERP product portfolio as well as the Presales role. If you are interested in this position, read more here! For all of our other vacancies and internships, please visit https://campus.oracle.com.

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  • Earliest use of Comments as Semantically Meaningful Things in a Program?

    - by Alan Storm
    In certain corners of the PHP meta-programming world, it's become fashionable to use PHPDoc comments as a mechanism for providing semantically meaningful information to a program. That is, other code will parse the doc blocks and do something significant with the information encoded in those comments. Doctrine's annotations and code generation are an example of this. What's the earliest (or some early) use of this technique? I have vague memories of some early java Design by Contract implementations doing similar things, but I'm not sure of those folks were inventing the technique, or if they got it from somewhere. Mainly asking so I can provide some historical context for PHP developers who haven't come across the technique before, and are distrustful of it because it seems a little crazy pants.

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  • understanding computers [closed]

    - by Ashwin
    Possible Duplicate: Good resources to understand how a program interacts with machine hardware I don't know if this is the correct StackExchange site to ask this question. But I could not find any other. I want to understand how a computer works from the software level to the internal structure. For example what happens when I press a button on keyboard. The OS interprets it and then what changes happen in the flip-flops. How is an operating system written? If it is written using some programming language, then how is that interpreter written. At some point it has to come down to the hardware, right? I know to program in c, c++ and java. But after all these years I am still not sure about what is happening inside. I would be grateful to anyone who points me to to a link or a video that explains this to the deep.

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  • Comparing the Performance of Visual Studio&apos;s Web Reference to a Custom Class

    As developers, we all make assumptions when programming. Perhaps the biggest assumption we make is that those libraries and tools that ship with the .NET Framework are the best way to accomplish a given task. For example, most developers assume that using <a href="http://www.4guysfromrolla.com/articles/120705-1.aspx">ASP.NET's Membership system</a> is the best way to manage user accounts in a website (rather than rolling your own user account store). Similarly, creating a Web Reference to communicate with a <a href="http://www.4guysfromrolla.com/articles/100803-1.aspx">web service</a> generates markup that auto-creates a <i>proxy class</i>, which handles the low-level details of invoking the web service, serializing parameters,

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  • Introduction to JBatch

    - by reza_rahman
    It seems batch processing is moving more and more into the realm of the Java developer. In recognition of this fact, JBatch (aka Java Batch, JSR 352, Batch Applications for the Java Platform) was added to Java EE 7. In a recent article JBatch specification lead Chris Vignola of IBM provides a high level overview of the API. He discusses the core concepts/motivation, the Job Specification Language, the reader-processor-writer pattern, job operator, job repository, chunking, packaging, partitions, split/flow and the like. You can also check out the official specification yourself or try things out with the newly released Java EE 7 SDK.

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  • How are design-by-contract and property-based testing (QuickCheck) related?

    - by Todd Owen
    Is their only similarity the fact that they are not xUnit (or more precisely, not based on enumerating specific test cases), or is it deeper than that? Property-based testing (using QuickCheck, ScalaCheck, etc) seem well-suited to a functional programming style where side-effects are avoided. On the other hand, Design by Contract (as implemented in Eiffel) is more suited to OOP languages: you can express post-conditions about the effects of methods, not just their return values. But both of them involve testing assertions that are true in general (rather than assertions that should be true for a specific test case). And both can be tested using randomly generated inputs (with QuickCheck this is the only way, whereas with Eiffel I believe it is an optional feature of the AutoTest tool). Is there an umbrella term to encompass both approaches? Or am I imagining a relationship that doesn't really exist.

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  • Do I have to learn html and javascript to create web applications?

    - by vainolo
    I am an experienced Java programmer, and I want to create a complex web application requiring dynamic pages, drawings, etc (take SO as an example). Do I have to learn javascript/html in order to create such an application? It is not that I don't want to learn another language (I've done this before), but technology on the javascript environment seems to change so fast that when you finish learning one framework it is already obsolete. I have checked a number of java framework for web development (spring, play), but not deeply. So can these frameworks (or other possible java frameworks that I'm not aware of) be used without learning html/javascript? I also have some python experience. So if I can do the app in python it is also an option.

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  • JavaOne is Free For Students!

    - by Yolande Poirier
    Attend the premier Java conference to learn about Java technologies and network with professionals. To be eligible, you must be taking a minimum of 6 units from a nonprofit institution of learning during the Fall 2014. You'll have access to JavaOne and OpenWorld keynotes and Exhibition Halls. And, space permitting, you  can attend all JavaOne sessions including HOLs (Hands-On Labs), conference sessions and BOF (Birds-of-a-Feather). This year, a lot of sessions are about parallel programming with Java 8, JVM languages, cloud and Internet of Things. Don't miss this opportunity to attend for free. Register now! 

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  • C++ compiler structures such as Virtual method Table etc

    - by Roger
    I am aware of the C++ Virtual Table which allows dynamic dispatch for doing things at runtime (although if I am honest I am not completely sure of the full list of things it achieves). I am wondering what other "low level" aspects of C++ are there, which one doesnt usually come across when learning the C++ language? Things like: -How is multithreading and locking on objects performed? -Overloading/overwriting functions -Generics Are there other "structures", similar to the vtable, which assist with these types of things on a lower level? (and if anyone can help with what the VTable actually does it would be most appreciated!)

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  • Is there a name for this use of the State design pattern?

    - by Chris C
    I'm looking to see if there is a particular name for this style of programming a certain kind of behavior into a program. Said program runs in real time, in an update loop, and the program uses the State design pattern to do some work, but it's the specific way it does the work that I want to know about. Here's how it's used. - Object Foo constructed, with concrete StateA object in it - First loop runs --- Foo.Run function calls StateA.Bar --- in StateA.Bar replace Foo's state to StateB - Second loop runs --- Foo.Run calls StateB.Bar - Third loop runs --- Foo.Run calls StateB.Bar - Fourth loop --- etc. So in short, Foo doesn't have an explicit Initialize function. It will just have Run, but Run will do something unique in the first frame to initialize something for Foo and then replace it with a different action that will repeat in all the frames following it- thus not needing to check if Foo's already initialized. It's just a "press start and go" action. What would you call implementing this type of behavior?

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  • How difficult did you find the Java Certification Exam

    - by user22904
    I'm just starting out as a Java programmer and have very minimal experience. I would like to improve my knowledge and study for the Java certification. I realize everyone will have a different answer but for those who have taken the certification and passed it, I'd really appreciate if you could tell me your experiences. Just a couple of lines to let me know if you found it hard, very hard. Also how much time did you spend studying. Sorry that this is not a good question. My native language is not English so it is hard for me to say what I want to ask.

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  • atheros wireless ar9285 driver

    - by nikola
    I have been having problems with wireless on Ubuntu 10 and above, Mint 11 and above. The problem is in the driver for the wireless... I can see that there is no driver installed and yet it works but reduced a lot, for example: on windows 7 ultimate 100% on distance of 1 meter (currently running) Mint Cinnamon 15 on same distance 70% when it goes under the 40 % it simply disconnects and than takes a lot of time to connect again I am new to Linux and I don't know anything about programming, yet I love the interface and look of the OS but don't want to reject it for couple of problems. There is, however, a problem with brightness control on laptop, it shows the notification and slider but with no effect The question is: Can somebody explain to me where to download and how to install the ar9285 driver for atheros wireless card laptop acer emachines eme529? or can someone explain this to me only for the LINUX MINT 15 http://www.jrhenkelmann.net/index.php?option=com_content&task=view&id=34 because the synaptic's interface is different than of mint 15 I KNOW this is Ubuntu community but the problems persist in all Linux versions

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  • Installing Ubuntu 64bit on Acer netbook causes black screen.

    - by big-marc
    Trying to install Ubuntu on an external usb 3 500 Gb hard-drive. I am using an Acer netbook. the specs are: amd c-60 1ghz with 4 Gb ram. I have a 64 bits windows 7 no2 installed. I downloaded the ubuntu-12.04.1-alternate-amd64 ISO and used the universal usb installer to install the Ubuntu When I reboot on the external hard drive, I have the language selection, then the menu...I choose to install...and I get a black flickering screen. and nothing more. Any suggestion?

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  • "A good programmer can be as 10+ times more productive than a mediocre one"

    - by m3th0dman
    I had read an interview with a great programmer (it is not in English) and in it he said that "a great programmer can be as 100 times as good as a mediocre one" giving reason for why good programmers are very well paid and why programming companies give many facilities for their employees. The idea was that there is a very large demand for good programmers, because of the above reason and that's why companies pay very much to bring them. Do you agree with this statement? Do you know any objective facts that could support it? Edit: The question has nothing to do with experience; if you talk about one great programmer with 1 year experience then s/he should be 10 times more productive than a mediocre programmer with 1 year experience. I agree that from certain experience years onwards, things start to dissipate but that's not the purpose of the question.

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